Siyang Zhao, Man Liu, Junyu Tian, Fangqin Dai, Guang Xu
{"title":"Review on Heat Treatment and Surface Modification Technology of High-Strength Bainite Steels","authors":"Siyang Zhao, Man Liu, Junyu Tian, Fangqin Dai, Guang Xu","doi":"10.1002/srin.202400685","DOIUrl":"https://doi.org/10.1002/srin.202400685","url":null,"abstract":"<p>Bainite steels with high strength, high toughness, and excellent wear resistance are gradually used in railway crossing, rail and wind power bearing, and other fields. The rapid development of modern industry has made the service environment of bainite steel in the heavy industry more and more harsh, which requires not only good overall performance of bainite steel matrix but also excellent surface properties. A lot of research work has been carried out to improve the properties of the bainite steel matrix and surface. In this review, the development of heat treatment technology of high-strength bainite steels is introduced, including austempering above and below martensite starting temperature, continuous cooling, and multistep austempering processes. Afterward, the surface modification technology of high-strength bainite steel is summarized emphatically, including carburizing, surface alloying, laser cladding, and integrated strengthening technology. Finally, the future research direction of high-strength bainite steel is prospected based on the current research status and application performance requirements.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 7","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. G. Nikhil, K. N. Chaithanya Kumar, Shardendu Shukla, B. Bhav Singh, K. S. Suresh, R. Arockia Kumar
{"title":"Effects of Hot Rolling on the Microstructure, Mechanical, and Damping Properties of High-Nitrogen Stainless Steel","authors":"T. G. Nikhil, K. N. Chaithanya Kumar, Shardendu Shukla, B. Bhav Singh, K. S. Suresh, R. Arockia Kumar","doi":"10.1002/srin.202400785","DOIUrl":"https://doi.org/10.1002/srin.202400785","url":null,"abstract":"<p>In this study, the mechanical and damping properties of high-nitrogen stainless steel, containing 0.65 wt% nitrogen, after being subjected to hot rolling to deformation ratios 19%–85% are investigated. Mechanical properties are assessed using tensile testing and Vickers hardness testing while damping properties are analyzed using a dynamic mechanical analyzer. A significant improvement in tensile strength is observed in samples deformed to an 85% reduction, showing an ultimate tensile strength of 1227 MPa compared to the initial 810 MPa of the annealed sample. Both the frequency and temperature damping capacities increase with the amount of deformation, peaking at 66% reduction, before slightly declining at 85% reduction. In the study, Finkelshtain–Rosin internal friction peaks, characteristic of austenitic steels, are identified in the temperature range of 100–250 °C. Deformation up to a 66% thickness reduction results in deformed grains with a continuous increase in dislocation density, accounting for trends in the mechanical and damping properties. However, the 85% reduction leads to a finer microstructure with a high fraction of low-angle grain boundaries formed through continuous dynamic recrystallization during hot rolling. This creates immobile dislocation networks, which adversely affect the damping properties.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 7","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144525081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xuan-Wei Lei, Chun-Long Jiang, Li Sun, Xiang Luo, Zhi Cheng
{"title":"Investigation on the Weldability of Developed High-Strength Hull Structure Steel","authors":"Xuan-Wei Lei, Chun-Long Jiang, Li Sun, Xiang Luo, Zhi Cheng","doi":"10.1002/srin.202400742","DOIUrl":"https://doi.org/10.1002/srin.202400742","url":null,"abstract":"<p>The weldability of a developed high-strength hull structure steel is investigated using a coarse-grained heat-affected zone (CGHAZ) thermal simulation and duplex double welding under a heat input of ≈20 kJ cm<sup>−1</sup>. From the results, the average impact test energy at −50 °C for the simulated CGHAZ samples is 142 J and for samples with V-notch position 0.5 mm from the fusion line (FL) was 152 J. The impact test energies for the V-notch position at the FL also show good toughness. The simulated samples and samples from the weld joint are machined into standard sizes to test their tensile strengths, which meet the request high strength. It is concluded that the high strength of the CGHAZ is mainly due to phase transformation and is supplemented by solid solution strengthening. The good low-temperature toughness is mainly due to the high Ni content. All the results are comparable to the reported mechanical property test results of the weld joint of navy HSLA-100 steel under a similar heat input. This suggests that the developed high-strength hull structure steel exhibits satisfactory weldability.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 7","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144525082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fang Huang, Yaohui Song, Huaying Li, Ming Zhao, Guanzheng Su, Yugui Li
{"title":"High-Temperature Deformation Behavior and Microstructural Evolution of N06625 Nickel-Based Alloy","authors":"Fang Huang, Yaohui Song, Huaying Li, Ming Zhao, Guanzheng Su, Yugui Li","doi":"10.1002/srin.202400735","DOIUrl":"https://doi.org/10.1002/srin.202400735","url":null,"abstract":"<p>Herein, the hot deformation behavior and microstructure evolution of N06625 superalloy are studied. Hot deformation behavior at 950–1200 °C and strain rate 0.1–10 s<sup>−1</sup> are carried out by Gleeble-3800 thermal simulator machine. The activation energy (<i>Q</i>) of the alloy is calculated by the change of stress–strain curve. The microstructure of the experimental material is characterized by electron backscatter diffraction, and it is found that the recrystallization fraction rate increases with the increase of temperature, but decreases first and then increases with the increase of strain rate. Discontinuous dynamic recrystallization is the main nucleation mechanism of N06625 superalloy. Continuous dynamic recrystallization (CDRX) is the auxiliary nucleation mechanism; CDRX gradually decreases with the increase of temperature. In addition, it is found that the evolution of special boundaries is closely related to the strain rate. The longer deformation time is beneficial to the interaction of grain boundaries, which leads to the special boundary fraction, and the increase of special boundary fraction can effectively weaken the preferred orientation caused by recrystallization growth.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 6","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144190687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Teng Zhao, Yiyang Li, Gang Yin, Lingzhi Wu, Ruixia Sun, Cong Zhang, Ruijie Zhang, Yongwei Wang, Dil Faraz Khan, Haiqing Yin, Xuanhui Qu
{"title":"Regulating Oxides Enhances the Mechanical Properties of Additively Manufactured Martensitic Stainless Steel","authors":"Teng Zhao, Yiyang Li, Gang Yin, Lingzhi Wu, Ruixia Sun, Cong Zhang, Ruijie Zhang, Yongwei Wang, Dil Faraz Khan, Haiqing Yin, Xuanhui Qu","doi":"10.1002/srin.202400722","DOIUrl":"https://doi.org/10.1002/srin.202400722","url":null,"abstract":"<p>\u0000Laser powder bed fusion (LPBF), a subset of additive manufacturing, is used increasingly to produce martensitic stainless steels (MSSs) for aerospace and medical devices. However, excessive oxygen content in MSS powder generally impairs the mechanical properties of parts produced via LPBF. To investigate the effect of oxides on additively manufactured MSS, this study utilizes powders with various oxygen contents and printed numerous samples under different parameters. This article systematically analyzes the source, morphology, and distribution of oxides in MSS samples and their effects on the microstructure and mechanical properties. It is found that MSS samples printed with high-oxygen powder exhibit higher strength and hardness. The average hardness of high-oxygen powder-printed samples increases by 14.2 HV<sub>3</sub> over low-oxygen samples. Additionally, their average tensile and yield strengths of 1025.97 and 809.18 MPa show increases of 3.36% and 17.33%, respectively. This provides a reference for regulating oxides in additively manufactured MSS and potentially benefiting from them.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 6","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144190686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Onur Okur, Kemal Davut, Gianfranco Palumbo, Burak Nalcaci, Pasquale Guglielmi, Mustafa Alp Yalcin, Recep Calin, Mehmet Erdogan
{"title":"Chemical Composition Optimization and Isothermal Transformation of δ-Transformation-Induced Plasticity Steel for the Third-Generation Advanced High-Strength Steel Grade","authors":"Onur Okur, Kemal Davut, Gianfranco Palumbo, Burak Nalcaci, Pasquale Guglielmi, Mustafa Alp Yalcin, Recep Calin, Mehmet Erdogan","doi":"10.1002/srin.202400648","DOIUrl":"https://doi.org/10.1002/srin.202400648","url":null,"abstract":"<p>A new low-manganese transformation-induced plasticity steel is designed with optimized nickel content to achieve superior strength and ductility while minimizing the use of expensive nickel. The steel is optimized using JMatPro software, then cast, and hot rolled. To assess the effect of intercritical annealing on austenite (martensite at room temperature) volume fraction and carbon content, hot-rolled steel samples quenched from different annealing temperatures (680–1100 °C) are used. Additionally, hot-rolled steel coupons are intercritically annealed at about 50% austenite formation temperature (740 °C) and then subjected to isothermal treatments at 300–425 °C for varying times (10–90 min). After optimizing these treatments to maximize retained austenite (RA), tensile specimens are heat-treated first at 740 °C and then isothermally at 325 °C. Thermodynamic calculations suggest that aluminum combined with silicon may lead to the δ ferrite formation, and even minimal nickel content can stabilize a considerable amount of austenite. In the experimental studies, it is shown that lower-temperature bainitic holding enhances austenite stability by enriching the carbon content. Optimized two-stage heat treatments yield up to 25.8% RA, with a tensile strength of 867.2 MPa and elongation of 40.6%, achieving a strength-elongation product of 35.2 GPa×%, surpassing the third-generation advanced high-strength steel grades minimum requirement of 30 GPa×%.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 7","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144525069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of Solid Solution Process on Dissolving Behavior of Precipitates in FB2 Steel","authors":"Dapeng Gu, Siyuan Gao, Wenlong Yan, Guoqu Shen, Xingang Liu, Mingren Xu","doi":"10.1002/srin.202400670","DOIUrl":"https://doi.org/10.1002/srin.202400670","url":null,"abstract":"<p>The dissolution behaviors of the precipitates in FB2 steel after solid solution treatment at 900, 1000, and 1100 °C for 8 h and at 1100 °C for 2, 5, and 10 h are studied by optical microscopy, scanning electron microscopy, X-ray diffraction, and electrolytic extraction experiments. In the experimental results, it is shown that with the increase of solid solution temperature, the precipitates dissolve obviously, and the martensite lath bundle size and grain size increase. After solid solution treatment at 1000 °C, M<sub>23</sub>C<sub>6</sub> dissolves completely. After solid solution treatment at 1100 °C, BN is generated. With the extension of solid solution time, the precipitates dissolve significantly, the grain size increases, and the number density and volume fraction decrease. From the perspective of microstructure, precipitates evolution, and energy saving, the best solid solution process for FB2 steel is 1100 °C for 8 h.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 7","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lassi Raami, Marco Wendler, Olena Volkova, Pasi Peura
{"title":"The Effect of Bake Hardening on Quenched and Partitioned AISI 420 Stainless Steel","authors":"Lassi Raami, Marco Wendler, Olena Volkova, Pasi Peura","doi":"10.1002/srin.202400251","DOIUrl":"https://doi.org/10.1002/srin.202400251","url":null,"abstract":"<p>Bake hardening (BH) is a static strain aging phenomenon, where the yield strength of steel increases during industrial paint baking. In this study, the effect of standard BH treatment on the mechanical properties of a quenched and partitioned (Q&P) AISI 420 stainless steel is investigated. The parameters for the Q&P treatment are selected based on numerical simulations, dilatometry, X-ray diffraction, and tensile tests, and the results are compared to conventional quenching and tempering (Q&T) treatment. It is shown that, in comparison with Q&T, Q&P can slightly increase the strength of the steel without sacrificing elongation. Heat-treated samples are then subjected to a paint baking treatment with and without prestrain. It is indicated that the mechanical properties of the heat-treated steel are not affected by paint baking without prestrain, whereas after a 2% prestrain the yield strength is drastically increased up to 1800 MPa, resulting in BH index exceeding 100 MPa. However, this increase in yield strength is instantly followed by necking and reduced post-uniform elongation. The results suggest that the effect of industrial paint baking is a considerable practical aspect in the design of Q&P components if the steel is subjected to deformation before painting.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/srin.202400251","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liu Zhan, Guo Yanhui, Cui Mingzhe, Pang Linghuan, Liu Xin, Fu Bin
{"title":"Strength-Ductility Synergy in an Austenitic Stainless Steel Processed by Warm Rolling and Subsequent Cryogenic Treatment","authors":"Liu Zhan, Guo Yanhui, Cui Mingzhe, Pang Linghuan, Liu Xin, Fu Bin","doi":"10.1002/srin.202400747","DOIUrl":"https://doi.org/10.1002/srin.202400747","url":null,"abstract":"<p>The austenitic stainless steel undergo warm rolling, followed by cryogenic treatment. The warm-rolled and cryogenically treated (WR-CT) sample exhibits superior strength and ductility compared to the warm-rolled (WR) sample, achieving a yield strength of 949 MPa and an elongation of ≈56.2%. The enhanced strength is attributed to the higher dislocation density, additional grain refinement, and the presence of martensite in the WR-CT sample. The WR and WR-CT samples exhibit similar deformation mechanisms. In the initial stage, dislocation slip predominantly governs the deformation. During the intermediate stage, the transformation-induced plasticity (TRIP) effect dominates the deformation mechanism. In the final stage, nearly all austenite transforms into martensite, and deformation mainly occurs via dislocation slip within the martensite phase. However, in the WR-CT sample, the TRIP effect is delayed during the stable processing stage (≈8–23%) due to the higher mechanical stability of austenite, resulting from further grain refinement and higher dislocation density. Additionally, the coordinated deformation of strain-induced martensite with varying orientations contributes to delayed necking, achieving an optimal balance between strength and ductility.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 7","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144524844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Phosphorus Partition in an Industrial Basic Oxygen Furnace Process in Ukraine","authors":"Olena Volkova, Nataliia Tinkova, Rapuruchukwu Ifeyinwa Onaa, Lukas Neubert, Kostiantyn Niziaiev, Dmytro Zotov","doi":"10.1002/srin.202400693","DOIUrl":"https://doi.org/10.1002/srin.202400693","url":null,"abstract":"<p>\u0000Phosphorus partition data from Ukrainian integrated steel plants are analyzed, focusing on the influence of parameters such as the basicity (CaO/SiO<sub>2</sub>), optical basicity, tapping temperature, and the contents of (FeO), (MgO), and (Al<sub>2</sub>O<sub>3</sub>) in the slag. It is found that the phosphorus partition decreases with increase in tapping temperature and increases with the optical basicity. An increase in the phosphorus partition (P)/[P] followed by a decrease with increase of (CaO/SiO<sub>2</sub>) are observed. It is found that the optimal value, break point at which phosphorus partition changes its dependence to opposite, has a direct dependence on tapping temperature. At (CaO/SiO<sub>2</sub>) = 1.9–2.1, (P)/[P] increases linearly with increasing (FeO). However with higher value of (CaO/SiO<sub>2</sub>) the breaking point when (P)/[P] starts to decrease with increase in (FeO) is noticed. Thereby the optimal value of (FeO) decreases with increasing tapping temperature. In case of (Al<sub>2</sub>O<sub>3</sub>) there is only decreasing of (P)/[P] with all (CaO/SiO<sub>2</sub>) and tapping temperatures. Moreover, the effect of (MgO) varies with (CaO/SiO<sub>2</sub>). These industrial results are supported by thermodynamic simulations using FactSage 8.1 and aligned with existing results from the literature.</p>","PeriodicalId":21929,"journal":{"name":"steel research international","volume":"96 8","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/srin.202400693","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}