Journal of the Japan Institute of Metals and Materials最新文献_第10页

Effect of Screen Open Hole on Nitriding Behavior, Corrosion Resistance and Wear Resistance of Plasma Nitrided Low Carbon Steel Using Ti Screen 筛孔对Ti筛等离子体渗氮低碳钢渗氮性能、耐蚀性和耐磨性的影响

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-03-01 DOI: 10.2320/JINSTMET.J2020049

K. Imamura, A. Nishimoto

{"title":"Effect of Screen Open Hole on Nitriding Behavior, Corrosion Resistance and Wear Resistance of Plasma Nitrided Low Carbon Steel Using Ti Screen","authors":"K. Imamura, A. Nishimoto","doi":"10.2320/JINSTMET.J2020049","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2020049","url":null,"abstract":"In order to investigate the e ﬀ ect of the screen hole state of the active screen plasma nitriding ( ASPN ) process using Ti screen, low carbon steel S15C was treated by ASPN treatment and DC plasma nitriding treatment ( S – DCPN ) using the Ti screen with the hole diameter of ϕ 5mm, 10mm, and 20mm and the open area ratio of 0 ％ , 15 ％ , 35 ％ , and 55 ％ . Plasma nitriding was performed at 873K for 180min at a gas pressure of 300Pa under an atmosphere of 75 ％ N 2 + 25 ％ H 2 . After the nitriding treatment, X – ray di ﬀ raction ( XRD ) , surface microstructure observation, cross – section microstructure observation, wear test, Vickers hardness test, glow discharge optical emission spectrometry ( GD – OES ) , and corrosion test were performed. As a result, the wear resistance of the ASPN – treated samples was improved under the condition that the deposit particles were small and the deposit layer was thick. In the cross – sectional microstructure of the S – DCPN – treated samples, a compound layer composed of iron nitrides and a di ﬀ usion layer in which γ ’ – Fe 4 N was precipitated by nitrogen di ﬀ usion were con ﬁ rmed. The surface compound layer of iron nitrides was not formed when a screen with a hole size of 20mm and open area ratio of 55 ％ was used. The results of SEM – EDX also con ﬁ rmed the di ﬀ usion of titanium by S – DCPN treatment using a Ti screen. ［ doi:10.2320 / jinstmet.J2020049 ］ ( Received October 14, 2020; Accepted November 18, 2020; Published January 22, 2021 )","PeriodicalId":17322,"journal":{"name":"Journal of the Japan Institute of Metals and Materials","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86306232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modified Cellular Automaton Simulation of Metal Additive Manufacturing 金属增材制造的改进元胞自动机仿真

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-03-01 DOI: 10.2320/MATERTRANS.MT-M2021009

J. Kubo, Yuichiro Koizumi, Takuya Ishimoto, T. Nakano

{"title":"Modified Cellular Automaton Simulation of Metal Additive Manufacturing","authors":"J. Kubo, Yuichiro Koizumi, Takuya Ishimoto, T. Nakano","doi":"10.2320/MATERTRANS.MT-M2021009","DOIUrl":"https://doi.org/10.2320/MATERTRANS.MT-M2021009","url":null,"abstract":"Metal additive manufacturing ( AM ) technologies are attracting attentions not only as a forming process but also as microstructure controlling processes. In powder bed fusion ( PBF ) AM, crystal orientations can be controlled by scanning strategies of energy beam. To optimize microstructures, computer simulations for predicting microstructures play very important roles. In this work, we have developed simulation programs to explain the mechanism of the crystal orientation control. First, we simulated the shape of melt pool by analyzing the heat transfer using apparent heat conductivity when the penetration of laser beam through keyholes was taken into consideration because of the evaporation and accompanying convections. It was assumed that the primary crystal growth direction can be determined by the temperature gradient, and the crystals grow keeping the growth direction as generally recognized. The shapes of simulated melt pools agree well with experimental observations. The modi ﬁ ed cellular automaton simulations successfully reproduced two typical textures with di ﬀ erent preferential orientations along the building directions of 〈 001 〉 and 〈 011 〉 when the bidirectional scanning with and without a rotation of 90° was accomplished between the layers. ［ doi:10.2320 / jinstmet.J2020028 ］","PeriodicalId":17322,"journal":{"name":"Journal of the Japan Institute of Metals and Materials","volume":"117 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72724349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Effect of Rolling Temperature on Room Temperature Formability and Texture Formation of Mg-3 mass％Al-1 mass％Sn Alloy Sheet 轧制温度对Mg-3质量%Al-1质量%Sn合金板材室温成形性能和织构形成的影响

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-03-01 DOI: 10.2320/JINSTMET.J2020055

H. Fukuoka, Xinsheng Huang, Kazutaka Suzuki, Yuhki Tsukada, T. Koyama, Y. Chino

{"title":"Effect of Rolling Temperature on Room Temperature Formability and Texture Formation of Mg-3 mass％Al-1 mass％Sn Alloy Sheet","authors":"H. Fukuoka, Xinsheng Huang, Kazutaka Suzuki, Yuhki Tsukada, T. Koyama, Y. Chino","doi":"10.2320/JINSTMET.J2020055","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2020055","url":null,"abstract":"E ﬀ ect of rolling temperature on room temperature formability and texture formation of Mg – 3mass ％ Al – 1mass ％ Sn ( AT31 ) alloy sheet was investigated, and compared with the results of Mg – 3mass ％ Al – 1mass ％ Zn ( AZ31 ) alloy sheet. When the rolling temperature was set to a high temperature ( 798K ) , AT31 alloy showed almost the same basal texture intensity as AZ31 alloy rolled at the same condition. When the rolling temperature was set to a low temperature ( 723K ) , AT31 alloy showed lower basal texture intensity than AZ31 alloy rolled at the same condition. As a result of Erichsen test, when the rolling temperature was set to 798K, AT31 alloy exhibited excellent Erichsen value more than 8.8mm, which corresponded to AZ31 alloy rolled at the same condition. On the other hand, when the rolling temperature was set to 723K, AT31 alloy exhibited higher Erichsen value ( 6.7mm ) than that of AZ31 alloy ( 4.5mm ) . The variations in Erichsen values with di ﬀ erences in alloy composition and rolling temperature were closely related to the variations in basal texture intensity. Recrystallization behavior of AT31 alloy during the initial stage of the ﬁ nal annealing was investigated. It is found that recrystallization mainly occurred at grain boundaries, and grains with more random orientation were recrystallized, when the rolling temperature was set to 798K. Mechanisms of recrystallization and random texture formation were almost the same with those of AZ31 alloy. The reason why AT31 alloy rolled at 723K exhibited more random texture than AZ31 rolled at the same condition is that grains with more random orientation were recrystallized at grain boundaries during the ﬁ nal annealing.","PeriodicalId":17322,"journal":{"name":"Journal of the Japan Institute of Metals and Materials","volume":"332 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76586758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Comparative Investigation of the Mechanical and Wear Properties of Multilayer Si-DLC/DLC Films Si-DLC/DLC多层膜力学与磨损性能的比较研究

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-02-01 DOI: 10.2320/matertrans.mt-m2020261

Yukio Kobayashi, A. Nishimoto

{"title":"Comparative Investigation of the Mechanical and Wear Properties of Multilayer Si-DLC/DLC Films","authors":"Yukio Kobayashi, A. Nishimoto","doi":"10.2320/matertrans.mt-m2020261","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2020261","url":null,"abstract":"In this study, multilayer diamond-like carbon ﬁ lms 1µm thick with di ﬀ erent numbers of multilayer repetitions were deposited onto austenitic stainless steel SUS304 substrates using di ﬀ erent source gases. The in ﬂ uence of the gas and the di ﬀ erence in the number of multilayer repetitions on the adhesion strength and wear resistance of the ﬁ lms was subsequently investigated. The samples were subjected to cross- sectional microstructure observations, elemental analysis by glow-discharge optical emission spectroscopy, nano-indentation tests, Rockwell indentation tests, friction and wear tests, and delamination tests. The nano-indentation tests showed that the ﬁ lms prepared using C 2 H 2 gas were harder than those prepared using CH 4 gas. In addition, irrespective of the gas used, the ﬁ lm hardness was improved when four layers rather than two layers were deposited. However, the hardness of the eight layers ﬁ lm decreased. The Rockwell indentation tests showed no improvement in adhesiveness when the gas or the number of multilayer repetitions was varied. The wear tests revealed that the friction coe ﬃ cient of the ﬁ lms prepared using C 2 H 2 gas was smaller than that of ﬁ lms prepared using CH 4 gas. No di ﬀ erence was observed with increasing number of multilayer repetitions. The delamination tests showed that the distance until delamination of the ﬁ lms prepared using C 2 H 2 gas was longer than that of the ﬁ lms prepared using CH 4 gas. In addition, the distance until delamination was improved by changing the number of multilayer repetitions from two layers to four layers for both gases but decreased when the number of repetitions was extended to eight layers. In this study, the value of H / E (hardness / Young ’ s modulus) increased and various characteristics improved with increasing number of multilayer repetitions. [doi:10.2320 matertrans.MT-M2020261]","PeriodicalId":17322,"journal":{"name":"Journal of the Japan Institute of Metals and Materials","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80763071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Compressive Properties of Three-Layered Porous Aluminum Fabricated by Spacer Method Using Dissimilar Alloy Powders 不同合金粉末间隔法制备三层多孔铝的压缩性能

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-02-01 DOI: 10.2320/JINSTMET.J2020044

Y. Hangai, Mizuki Ando, Ryosuke Suzuki, M. Matsubara, T. Utsunomiya, N. Yoshikawa

引用次数: 1

Rapid Evaluation of Hydrogen Embrittlement Resistance for Spot-Welds of High Tensile Strength Steel Sheet by Slow Rate Tensile Shear Test under Hydrogen Charging Conditions 加氢条件下慢速率拉伸剪切试验快速评价高抗拉强度钢板点焊抗氢脆性能

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-02-01 DOI: 10.2320/jinstmet.j2020046

G. Kitahara, H. Matsuoka, T. Asada

{"title":"Rapid Evaluation of Hydrogen Embrittlement Resistance for Spot-Welds of High Tensile Strength Steel Sheet by Slow Rate Tensile Shear Test under Hydrogen Charging Conditions","authors":"G. Kitahara, H. Matsuoka, T. Asada","doi":"10.2320/jinstmet.j2020046","DOIUrl":"https://doi.org/10.2320/jinstmet.j2020046","url":null,"abstract":"Automobile manufacturers are accelerating adoption of spot welding of Advanced High-Strength-Steels (AHSS) sheets to reduce weight of automobile bodies. Rapid evaluation of the hydrogen embrittlement (HE) resistance for the spot-welds of AHSS sheets is required, since it is worried that the HE resistance of the nugget will deteriorate compared to the base metal due to the di ﬀ erence in microstructure caused by rapid cooling and solidi ﬁ cation during spot welding. However, evaluation of the HE resistance for the spot-welds has not been established. In this study, we prepared spot-welded specimens using AHSS sheets and performed tensile shear tests with varying tensile rates under hydrogen charging to evaluate the relationship between di ﬀ usible hydrogen content and tensile shear strength. As a result, the tensile shear strength of spot welds decreased as the amount of di ﬀ usible hydrogen increased. The quasi-cleavage fracture surface and intergranular fracture surface were observed at the nugget and inside the crack generated at the nugget-heat a ﬀ ected zone interface. Furthermore, as the results of crack growth behavior and hydrogen thermal desorption spectroscopy analysis, hydrogen embrittlement in spot welds can be attributed to the stress-induced di ﬀ usion of hydrogen and the hydrogen trapped in dislocation and vacancy clusters at crack tips. [doi:10.2320 /","PeriodicalId":17322,"journal":{"name":"Journal of the Japan Institute of Metals and Materials","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80844602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Organic Additives on Electrodeposition Behavior of Zn from Zincate Solution Containing Potassium Hydroxide and Its Micro Structure 有机添加剂对含氢氧化钾锌酸盐溶液中锌电沉积行为及其微观结构的影响

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-02-01 DOI: 10.2320/jinstmet.j2020043

K. Fukumoto, S. Oue, Tsukasa Niwa, Yoshiharu Kikuchi, S. Akamatsu, Hiroaki Nakano

{"title":"Effect of Organic Additives on Electrodeposition Behavior of Zn from Zincate Solution Containing Potassium Hydroxide and Its Micro Structure","authors":"K. Fukumoto, S. Oue, Tsukasa Niwa, Yoshiharu Kikuchi, S. Akamatsu, Hiroaki Nakano","doi":"10.2320/jinstmet.j2020043","DOIUrl":"https://doi.org/10.2320/jinstmet.j2020043","url":null,"abstract":"Zn was electrodeposited on an Fe electrode at a current density of 505000A·m12, charge of 4 © 104C·m12, and temperature of 313K in an unagitated zincate solution containing 0.62mol·dm13 of ZnO, 4.0mol·dm13 of KOH or NaOH, and organic additives. The effects of KOH and NaOH on the deposition behavior of Zn in the solution containing the organic additives and on the microstructure of the deposits were investigated. In a solution containing a straight-chain polymer composed of a quaternary ammonium cation (PQ) and a quaternary ammonium salt with a benzene ring (QA), the current efficiency for Zn deposition in a high-current-density region (10005000A·m12) to produce glossy films was higher with KOH than that with NaOH. At high current densities above 1000A·m12, the Zn deposition approached the diffusion limitation of ZnO2 ions. With the addition of PQ and QA, the diffusion of ZnO2 ions was significantly suppressed, and the degree of suppression was smaller with KOH than that with NaOH. The polarization resistance at 200A·m12, which was investigated through alternating current impedance, revealed that the adsorption ability of PQ and QA onto the cathode was smaller with KOH than that with NaOH. Since the suppression effect of the additives on the Zn deposition was smaller with KOH than that with NaOH, the current efficiency for Zn deposition in the high-current-density region was larger with KOH. The upper limit of the current density needed to produce glossy films was smaller with KOH than that with NaOH, and spongy thin films were partially observed on platelet crystals obtained at high current densities in the KOH solution. The C content resulting from the additives in the deposited Zn was smaller with KOH because the adsorption ability of PQ and QA onto the cathode was smaller with KOH than that with NaOH. [doi:10.2320/matertrans.MT-M2021027]","PeriodicalId":17322,"journal":{"name":"Journal of the Japan Institute of Metals and Materials","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74826556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of One-Pass Strain on Steady-State Grain Size by Cyclic - HPT Straining 循环HPT应变对一次应变稳态晶粒尺寸的影响

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-02-01 DOI: 10.2320/JINSTMET.J2020045

H. Sato, N. Adachi, Y. Todaka

引用次数: 0

Effect of Ni Concentrations and C/O Ratios on the Stability of Nonmetallic Inclusions in Ni-Rich Ti-Ni Alloys Ni浓度和C/O比对富Ni Ti-Ni合金中非金属夹杂物稳定性的影响

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-01-01 DOI: 10.2320/jinstmet.j2020056

F. Yamashita, Y. Soejima, H. Akamine, M. Nishida

引用次数: 0

Understanding the Anomalous Discontinuous Precipitation in Cu-Ni-X (X = Co,Fe) Alloys Based on CALPHAD Method and Phase-Field Simulation 基于CALPHAD法和相场模拟的Cu-Ni-X (X = Co,Fe)合金中异常不连续析出

Journal of the Japan Institute of Metals and Materials Pub Date : 2021-01-01 DOI: 10.2320/jinstmet.j2020037

J. Goto, T. Koyama, Yuhki Tsukada

{"title":"Understanding the Anomalous Discontinuous Precipitation in Cu-Ni-X (X = Co,Fe) Alloys Based on CALPHAD Method and Phase-Field Simulation","authors":"J. Goto, T. Koyama, Yuhki Tsukada","doi":"10.2320/jinstmet.j2020037","DOIUrl":"https://doi.org/10.2320/jinstmet.j2020037","url":null,"abstract":"The anomalous discontinuous precipitation which is called “Cellular Decomposition (CD)” has been observed in Cu–Ni–X (X = Co,Fe) ternary systems, i.e., the precipitate morphology in cell region is a nanoscale fine fiber, the direction of the fibers does not take specific crystal orientation, and the morphology is wavy. In this study, we elucidated the reason why such an unusual cellular decomposition occurs by means of the Calphad method and phase–field simulations. In particular, we focused on the spinodal decomposition inside the grain before CD. The results showed that the Ni component preferentially segregates at the interface region between precipitate and matrix phase in the two–phase microstructure by spinodal decomposition, and the Ostwald ripening is suppressed due to the low solute solubility of the matrix phase in the Cu–Ni–X (X = Co,Fe) system. Hence, the spinodal microstructure formed inside the grain before CD is trapped into high–energy level, which induces the discontinuous precipitation with high speed grain boundary migration, that provides “Cellular Decomposition”. [doi:10.2320/jinstmet.J2020037]","PeriodicalId":17322,"journal":{"name":"Journal of the Japan Institute of Metals and Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90787419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1