Materials Science-medziagotyra最新文献_第2页

Effect of Cooling Process on Microstructure and Properties of Low Carbon Bainite Steel 冷却工艺对低碳贝氏体钢组织和性能的影响

4区材料科学

Materials Science-medziagotyra Pub Date : 2023-10-03 DOI: 10.5755/j02.ms.34199

Zhifeng CAO, JiMan WANG, Shenggang ZHOU, Hu YAN

{"title":"Effect of Cooling Process on Microstructure and Properties of Low Carbon Bainite Steel","authors":"Zhifeng CAO, JiMan WANG, Shenggang ZHOU, Hu YAN","doi":"10.5755/j02.ms.34199","DOIUrl":"https://doi.org/10.5755/j02.ms.34199","url":null,"abstract":"This article used Mn-Mo-Cr-B low-carbon bainitic steel as the experimental material. The continuous cooling transformation curve of the steel during continuous cooling was determined using a Gleeble-1500D thermal simulation test machine, and a corresponding phase transformation model for bainitic steel during continuous cooling was established. The influence of different cooling rates and final cooling temperatures on the microstructure and mechanical properties of the steel was investigated. Employing metallography, SEM, and EBSD techniques, the microstructure, crystallographic orientation, and grain boundary angle distribution of the low-carbon bainitic steel were explored, and their relationship with the steel's strength and toughness was studied. The research findings reveal that varying cooling rates and final cooling temperatures impact the phase transformation process and microstructure of the steel, consequently affecting its mechanical properties indirectly. With increasing cooling rate, the diffusion and fineness of martensite increase, and the quantity of lath bainite grows while the laths become finer. Elevated final cooling temperatures lead to larger martensitic-austenitic (MA) islands and reduced lath bainite quantity, causing the laths to become wider. Through analysis of the substructure of bainitic steel, it was determined that the bainite organization in the tested steel comprises primary austenite grains, lath packet, and lath block in succession. Lath packets are composed of lath blocks with different orientations, where lath size predominantly controls strength. Finer lath size corresponds to higher strength, and the influence of substructure on toughness is comparatively minor.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135738805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-objective Optimization of Laser Welds with Mixed WC/Co/Ni Experiments Using Simplex-centroid Design 基于单纯质心设计的WC/Co/Ni混合激光焊接多目标优化

4区材料科学

Materials Science-medziagotyra Pub Date : 2023-09-18 DOI: 10.5755/j02.ms.33626

Chao-Yang ZHANG, Shenyu CHEN, Lin-gjun XIE, Echo YANG, Tong BU, Ivan CHEUNG, Ming-Der JEAN

{"title":"Multi-objective Optimization of Laser Welds with Mixed WC/Co/Ni Experiments Using Simplex-centroid Design","authors":"Chao-Yang ZHANG, Shenyu CHEN, Lin-gjun XIE, Echo YANG, Tong BU, Ivan CHEUNG, Ming-Der JEAN","doi":"10.5755/j02.ms.33626","DOIUrl":"https://doi.org/10.5755/j02.ms.33626","url":null,"abstract":"This work involves the preparation of WC/Co/Ni blends using different mixing ratios to form Co/Ni/WC composite-based coatings by laser cladding. The effect of each component and their mixtures on the mechanical properties was evaluated using a mixture design approach. The morphologies and microstructures of the laser clads were characterized using a scanning electron microscope and X-ray diffraction techniques. Cracking behavior and fracture based on residual stresses are explored. In addition, the mathematical models between the three-component mixtures and the mechanical properties of the laser clad were established. The results showed that the welds containing 50 % WC-50 % Ni alloys were successfully deposited by laser cladding with favorable mechanical properties. These welds reduced the remarkable fracture crack activities and did not cause delamination in the laser clads. An increase in WC content significantly enhances wear resistance and microhardness, except for the crack susceptibilities in all mixtures. Additionally, when increased Co/Ni on WC, the reduction of adhesive wear is more significant than that of abrasive wear. Wear resistance is improved by the high content of WC particles in the laser-clad joints. Based on the mixture models, better mixed ratios for the blends that were developed using a multi-objective superimposed optimization technique make these blended materials promising candidates and can ensure the quality of laser clads. The findings from this study will greatly contribute to optimizing the blend ratio of the three-ingredient mixture based on mixture design to enhance structural evolution and mechanical properties, and also obtain better quality laser-clad coatings.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135202995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Heat Input on Microstructure and Mechanical Properties of Laser Weld Metal in 2507 Duplex Stainless Steel by Different Welding Speed and Welding Power 不同焊接速度和焊接功率对2507双相不锈钢激光焊接金属组织和力学性能的影响

4区材料科学

Materials Science-medziagotyra Pub Date : 2023-09-15 DOI: 10.5755/j02.ms.34338

Shuai ZHAO, Yaxuan BI

{"title":"Influence of Heat Input on Microstructure and Mechanical Properties of Laser Weld Metal in 2507 Duplex Stainless Steel by Different Welding Speed and Welding Power","authors":"Shuai ZHAO, Yaxuan BI","doi":"10.5755/j02.ms.34338","DOIUrl":"https://doi.org/10.5755/j02.ms.34338","url":null,"abstract":"This manuscript attempts to explore the macroscopic morphology microstructural aspects and mechanical properties of different laser welding speed and power on the 2.5 mm thick DSS welding joint. Through the evaluation of 12 groups samples with different welding parameters, we found that the optimal laser welding process parameters were a welding speed of 6mm/s, laser power of 1.6 kW and welding speed of 8 mm/s, laser power of 1.7 kW. When the heat input was 2.125 kJ/cm, the content of ferrite and austenite was relatively uniform, and the ratio was close to 1:1. We found that the hardness of the weld metal zone was slightly higher than that of the base metal, with an average value of 330 HV. When the heat input was 2.125 kJ/cm, the microhardness of welded joint was better than other parameters, reaching 400 HV in the welding metal zone. The tensile strength of the weld was enhanced with the increase of heat input, and the maximum was 900 MPa. Through SEM analysis, the fracture locations of tensile specimens were all in the weld zone, and the fracture morphology had a large number of dimples, belonging to the ductile fracture.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135397081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structure and Ionic Conductivity of Ga and Nb Dual Doped LLZO Synthesized by Sol-Gel Method 溶胶-凝胶法合成Ga和Nb双掺杂LLZO的结构和离子电导率

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-09-01 DOI: 10.5755/j02.ms.34240

Jun Li, Fuzhong Wang, Leichao Meng, Tao Gao, Bo Liang, Hang Zhang, Meili Cui, Xinxin Lu, Ying Cao, Jiyong Chen

{"title":"Structure and Ionic Conductivity of Ga and Nb Dual Doped LLZO Synthesized by Sol-Gel Method","authors":"Jun Li, Fuzhong Wang, Leichao Meng, Tao Gao, Bo Liang, Hang Zhang, Meili Cui, Xinxin Lu, Ying Cao, Jiyong Chen","doi":"10.5755/j02.ms.34240","DOIUrl":"https://doi.org/10.5755/j02.ms.34240","url":null,"abstract":"More and more attention has been focused on Li7La3Zr2O12 (LLZO) because of the high ionic conductivity and excellent chemical stability. It is great significance to find suitable dopants for locking cubic LLZO and improving the conductivity of Li+ ions. The uniform nano powder can be obtained by the sol gel synthetic method, which is conducive to maintaining high sintering activity. In this work, Ga and Nb dual doped LLZO solid electrolyte powders were synthesized via sol gel method, and Ga and Nb dual doped LLZO solid electrolyte ceramic were obtained via traditional solid state sintering method. The phase and microstructure of Ga and Nb co-doped LLZO solid electrolyte were analyzed by combine X-ray diffraction with scanning electron microscope. The impedance of Ga and Nb dual doped LLZO (Li6.8-3xGaxLa3Zr1.8Nb0.2O12 (0≤x≤0.3)) solid electrolyte was measured by the electrochemical workstation, and then the conductivity was calculated. The results show that when the doping amount of Ga is x=0.2, it is a pure cubic LLZO structure with the highest conductivity value of 3.7×10-4 S cm-1 (tested at room temperature) due to the sample has a high relative density and reaches the optimal Li+ vacancy concentration.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44313661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure and Mechanical Properties of Fe-Based Alloy Coatings Fabricated by Laser Cladding 激光熔覆制备铁基合金涂层的组织与力学性能

4区材料科学

Materials Science-medziagotyra Pub Date : 2023-09-01 DOI: 10.5755/j02.ms.33919

Lu XIE, Yueming WANG

{"title":"Microstructure and Mechanical Properties of Fe-Based Alloy Coatings Fabricated by Laser Cladding","authors":"Lu XIE, Yueming WANG","doi":"10.5755/j02.ms.33919","DOIUrl":"https://doi.org/10.5755/j02.ms.33919","url":null,"abstract":"The Fe-based alloy coating was prepared on the surface of 25Cr2Ni4MoV steel substrate by laser cladding. The microstructure, microhardness, shear strength, friction and wear properties of the laser cladding coating were systematically studied. The results show that a good metallurgical bond has been formed between Fe-based alloy coating and substrate. The laser cladding layer is a typical dendritic crystal, which is composed of light gray and dark gray phases. The shear strength displacement curve shows the typical characteristics of brittle fracture, with an average shear strength of 280.83 MPa. The average dry friction coefficient, wear track depth and average wear volume of laser cladding Fe-based alloy coatings are (0.45 ± 0.01), (26 ± 3) μm and 0.066615 m3, respectively. The average dry friction coefficient, wear track depth and average wear volume of 25Cr2Ni4MoV substrate are (0.60 ± 0.01), (39 ± 3) μm and 0.13085 m3, respectively. The laser cladded Fe-based alloy coating exhibits much better wear resistance than the steel substrate, and the shear strength of the coating displays its potential for the application in the service environment of shear stress.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135048100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nature-inspired Apatite Production: Steam Processing of Calcium Carbonate and Tricalcium Phosphate Nanosized Powder Blends 自然启发的磷灰石生产:碳酸钙和磷酸三钙纳米粉末混合物的蒸汽加工

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-08-24 DOI: 10.5755/j02.ms.32132

Aiga Anna Joksa, K. Gross

引用次数: 0

Effects of the Growth Rate on the High-temperature Tensile Properties and Micro-organization of Directionally Solidified Ti-44Al-9Nb-1Cr-0.2W-0.2Y Alloys 生长速率对定向凝固Ti-44Al-9Nb-1Cr-0.2W-0.2Y合金高温拉伸性能和微观组织的影响

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-08-24 DOI: 10.5755/j02.ms.30647

Yao Huang, Zhuhang Jiang, Renheng Han, Chengzhi Zhao, Hexin Zhang

{"title":"Effects of the Growth Rate on the High-temperature Tensile Properties and Micro-organization of Directionally Solidified Ti-44Al-9Nb-1Cr-0.2W-0.2Y Alloys","authors":"Yao Huang, Zhuhang Jiang, Renheng Han, Chengzhi Zhao, Hexin Zhang","doi":"10.5755/j02.ms.30647","DOIUrl":"https://doi.org/10.5755/j02.ms.30647","url":null,"abstract":"In this experiment, Ti-44Al-9Nb-1Cr-0.2W-0.2Y alloy was prepared by the directional solidification method. The effect of different growth rates on tensile properties and microstructure orientation at high temperature was studied. Three kinds of alloys with different growth rates of 10 μm/s, 15 μm/s and 20 μm/s were prepared. The results show that the tensile properties of the alloy at 800 ℃ decrease with increasing growth rate, and recrystallization occurred at the position of intracrystal fracture in the microstructure. The size of columnar crystals decreases with the increase of the growth rate, increasing the number of grains and decreasing the orientation difference between the growth and axial directions as well as the preferred orientation of lamellar, and the anisotropy of the material, which leads to the obvious decrease of the tensile strength and plasticity. Combined with electron backscattering diffraction test results, the lamellar orientation of the effective parts of the three specimens after high temperature stretching was studied. It was found that the axial preferred orientation of the alloy specimens decreased obviously with the increase of the growth rate, and the orientation became disorderly and the uniformity of lamellar thickness decreased gradually with the increase of the growth rate. In addition, it was found that a new single-phase γ phase is formed in the microstructure after high temperature stretching, and the distribution range increased with the increase of the growth rate, which seriously degraded the axial preferred orientation of the alloy. It can be concluded that the directionally solidified alloy with a growth rate of 10 μm/s has better microstructure orientation and high temperature tensile properties.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49230424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and Properties of Masonry Mortar from Spontaneous Combustion Coal Gangue 自燃煤矸石砌筑砂浆的制备及性能研究

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-08-16 DOI: 10.5755/j02.ms.31843

Wenqing Meng, Xin Liu, Shenglei Feng, Hanlong Cui, Yapeng Zhang

{"title":"Preparation and Properties of Masonry Mortar from Spontaneous Combustion Coal Gangue","authors":"Wenqing Meng, Xin Liu, Shenglei Feng, Hanlong Cui, Yapeng Zhang","doi":"10.5755/j02.ms.31843","DOIUrl":"https://doi.org/10.5755/j02.ms.31843","url":null,"abstract":"To solve the problem of gangue stockpiling, this paper intends to study the feasibility of preparing masonry mortar based on spontaneous combustion gangue. After crushing the spontaneous combustion gangue, the gangue below 4.75 mm was selected, and substituted manufactured sand to prepare masonry mortar in equal quantity. The single factor test method was used to select the replacement rate of spontaneous combustion gangue, water-binder ratio (W/B) and water reducer dosage as variables to explore their effects on the basic properties of fresh mortar mixtures, such as fluidity, apparent density and water retention of fresh mortar, and the mechanical properties of hardened mortar. The anti-frost resistance of gangue mortar was evaluated by a freezing-thawing cycle test. SPSS.20 software was used for variance analysis, and the results showed that the replacement rate of spontaneous combustion gangue, W/B and water reducer dosage on mechanical properties of mortar differences are significant (P < 0.001). With the increase of the replacement rate of spontaneous combustion gangue, the mortar strength decreases, and with the rise of W/B, the mortar strength raises first and then reduces, while with the increase of the water reducer dosage, the mortar strength increases first and then decreases. Spontaneous combustion gangue mortar shows better anti-frost resistance under the freezing-thawing cycle. After 50 freezing-thawing cycles, the maximum mass and strength loss rate of mortar specimens are 2.4 % and 12.67 %, respectively. When the replacement rate of spontaneous combustion coal gangue is 100 %, the mechanical properties and anti-frost resistance of mortar both meet the requirements of the standard and realize the maximum utilization of gangue waste resources. This paper aims to provide theoretical support for the application of spontaneous combustion gangue in masonry mortar.","PeriodicalId":18298,"journal":{"name":"Materials Science-medziagotyra","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46061863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simple Ways to Obtain Activation Energy for Hydride Decomposition by Applying Data from a Volumetric Method to the Kissinger Equation 利用Kissinger方程的体积法数据求氢化物分解活化能的简单方法

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-08-16 DOI: 10.5755/j02.ms.32434

M. Song, Y. Kwak

引用次数: 0

Plasma electrolytic oxidation of AZ31 Mg alloy in bipolar pulse mode and influence of corrosion to surface morphology of obtained coatings AZ31镁合金双极脉冲模式等离子体电解氧化及其腐蚀对镀层表面形貌的影响

IF 1.1 4区材料科学

Materials Science-medziagotyra Pub Date : 2023-08-16 DOI: 10.5755/j02.ms.32182

R. Drunka, I. Blumbergs, P. Iesalniece, K. Savkovs, I. Šteins

引用次数: 1