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Recent progress in third-generation low alloy steels developed under M^3 microstructure control

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International Journal of Minerals,Metallurgy and Materials 2020年第1期27卷 1-9页

作者： Zhen-jia Xie Cheng-jia Shang Xue-lin Wang Xue-min Wang Gang Han Raja-devesh-kumar misra Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79968USA

During the past thirty years, two generations of low alloy steels(ferrite/pearlite followed by bainite/martensite) have been developed and widely used in structural applications. The third-generation of low alloy steels is expected to achieve high strength and improved ductility and toughness, while satisfying the new demands for weight reduction, greenness, and safety. This paper reviews recent progress in the development of third-generation low alloy steels with an M^3 microstructure, namely, microstructures with multi-phase, meta-stable austenite, and multi-scale precipitates. The review summarizes the alloy designs and processing routes of microstructure control, and the mechanical properties of the *** stabilization of retained austenite in low alloy steels is especially emphasized. Multi-scale nano-precipitates, including carbides of microalloying elements and Cu-rich precipitates obtained in third-generation low alloy steels, are then introduced. The structure–property relationships of third-generation alloys are also discussed. Finally, the promises and challenges to future applications are explored.

关键词： third-generation low alloy steels multi-phase microstructure meta-stable retained austenite multi-scale precipitates

Characterization of Compactness of Rust Layers on Weathering Steels by an Adsorption/Dehydration Test of Ethanol

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Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 846-856页

作者： Lujun Zhou Shanwu Yang Yi Dong Wenhua Zhang Jianwen Ding Guoliang Liu Chengjia Shang Raja devesh Kumar misra Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El PasoEl Paso.TX 79968 USA

A new method for evaluating the compactness of rust layers on steels has been proposed in the present study. The method includes adsorption and dehydration process of anhydrous ethanol. The protective ability of rust layers can be qualitatively reflected by the adsorption/dehydration rates. The specific surface area and porosity of rust layers can be calculated by a quantitative model. The results from the present method are consistent with electrochemical tests, N2 adsorption and X-ray diffraction analysis. The method characterizes the compactness of rust layers rather than that of corrosion products removed from the metal surfaces, which is generally practiced in classic N2 adsorption method. Furthermore, the method can reflect the compactness of inner rust layers, to which N2 adsorption is unavailable. The method provides a new approach for the study of rust layers.

关键词： Weathering steel Rust layers Ethanol adsorption/dehydration Specific surface area

Hydrogen trapping and electrochemical corrosion behavior of V–N microalloyed X80 pipeline steels consisting of acicular ferrite and polygonal ferrite

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Journal of Iron and Steel Research International 2022年第10期29卷 1683-1693页

作者： Ming-ming Wang Xiu-hua Gao Li-ying Song Cheng-lin Zhu Lin-xiu Du Raja devesh Kumar misra State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX79968USA

Hydrogen trapping behavior of V–N microalloyed X80 pipeline steels was studied by means of hydrogen permeation and hydrogen induced cracking(HIC)*** addition,the electrochemical performance of the steels in 3.5 wt.%NaCl solution was *** indicated that the microstructure of experimental steels mainly consisted of acicular ferrite and polygonal ferrite(PF).When the fraction of PF was 9.1%and 30.4%,hydrogen effective diffusion coefficient was 1.624×10^(−6) and 3.121×10^(−6) cm^(2)/s,*** pipeline steels were not susceptible to *** potential hydrogen traps distributed in homogeneous dispersion were conducive to high HIC *** increasing the fraction of PF from 9.1%to 30.4%,the corrosion current density increased from 5.39×10^(−6) to 9.49×10^(−6) A cm^(−2),the corrosion potential decreased from−0.48 to−0.57 V,and the charge transfer resistance decreased from 2301 to 2068Ωcm^(2),*** fraction of PF was disadvantageous for corrosion resistance because of galvanic corrosion.

关键词： Pipeline steel V-N microalloying Hydrogen induced cracking susceptibility Hydrogen permeation Electrochemical corrosion

Microstructural Evolution and Properties of a High Strength Steel with Different Direct Quenching Processes

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Journal of Iron and Steel Research International 2015年第4期22卷 344-351页

作者： Feng LU Chao WANG Long L Zhao-dong WANG Guo-dong WANG Raja devesh Kumar misra State Key Laboratory of Rolling and Automation Northeastern University Department of Metallurgical and Materials Engineering University of Texas at El Paso

A high strength low alloy steel with low carbon equivalent was selected for simulating online direct quench- ing and coiling （DQ-C） process. The influence of stop quenching temperature on mechanical properties and micro- structures was studied and compared with normal direct quenching and tempering （DQ-T） process. The study con- firmed that required mechanical properties were obtained for both the processes. Properties of the experimental steel with DQ-C process could reach the same level as that of DQ-T process in general. In the DQ-C process, strength de- creased with increase in stop quenching temperature. Martensite was obtained and experienced an aging process at stop quenching temperature below Mi. On fast cooling below Mi, martensite was partially transformed and carbon partitioning occurred during slow cooling. The reduction in solid solution carbon and increased amount of retained austenite led to lower strength compared with the DQ-T process. DQ-C process was more favorable for microalloy carbide precipitation. However, impact toughness under different cooling conditions was adequate because of low car- bon equivalent and refined microstructure.

关键词： high strength steel direct quenching slow cooling carbon partitioning precipitation

Tin-induced microstructural changes and associated corrosion resistance of biodegradable Mg–Zn alloy

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Rare Metals 2022年第3期41卷 883-888页

作者： Yun Gao Ping Zhao Xiang-Qian Cao R.devesh K.misra Wei Wang Ke-Zheng Chen Laboratory of Functional and Biomedical Nanomaterials College of Materials Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Provincial University Laboratory for Protected Horticulture&Architecture and Art College Weifang University of Science and TechnologyWeifang 262700China Department of Metallurgical Materials and Biomedical EngineeringUniversity of TexasEl PasoTX 79968USA

As a new degradable medical metal material, Mg–Zn alloy has been widely used in clinical application. However, its popularization and application are seriously restricted by poor corrosion performance in the biological liquid environment. For this reason, we added a relatively non-toxic element to the human body (Sn) to Mg–Zn alloy, and we prepared Mg–2Zn–3Sn ternary system alloy.

关键词： alloy corrosion alloy.

Hot Deformation Behavior and Microstructural Characteristics of Ti–46Al–8Nb Alloy

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Acta Metallurgica Sinica(English Letters) 2018年第9期31卷 933-944页

作者： Tian-Rui Li Guo-Huai Liu Mang Xu Tian-Liang Fu Yong Tian Ra-Ja devesh Kumar misra Zhao-DongWang State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and BiomedicalEngineeringUniversity of Texas at E1 PasoE1 PasoTX 79968-0521USA

Hot deformation behavior, microstructural evolution and flow softening mechanism were investigated in Ti-46A1-8Nb alloy via isothermal compression approach. The true stress-strain curves exhibited typical work hardening and flow softening, in which the dependence of the peak stress on temperature and strain rate was obtained by hyperbolic sine equation with Zener-Hollomon （Z） parameter, and the activation energy was calculated to be 446.9 kJ/mol. The microstructural analysis shows that the alternate dark and light deformed ribbons of Al-rich and Nb-rich regions appeared and were associated with local flow involving solute segregation. The Al segregation promoted flow softening mainly arising from the recrystaUization of V phase with low stacking fault energy. The coarse recrystallized 7 and several massive phase were observed at grain boundaries. While in the case of Nb segregation, t/B2 phase harmonized bending of lamellae, combined with the growth of recrystallized γ grains and α ＋ β ＋ γ→α＋ γ transition under conditions of temperature and stress, leading to the breakdown of α2/γ lamellar colony. During the hot compression process, gliding and dissociation of dislocations occurred in γ phase that acted as the main softening mechanism, leading to extensive γ twins and cross twins in α/γ lamellae and at grain boundaries. In general, homogeneous microstructure during the hot defor- mation process can be obtained in TiAl alloy with high Nb addition and low Al segregation. The deformation substructures intrinsically promote the formability of Ti--46Al-8Nb alloy.

关键词： Titanium aluminides Deformation behavior Activation energy Dynamic recrystallization Local flow softening

Advancements in three-dimensional titanium alloy mesh scaffolds fabricated by electron beam melting for biomedical devices: mechanical and biological aspects

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Science China Materials 2018年第4期61卷 455-474页

作者： Krishna Chaitanya Nune Shujun Li R. devesh Kumar misra Biomaterials Science and Engineering Laboratory Metallurgical Materials and Biomedical Engineering Department University of Texas at El Paso TX 79968 USA Institute of Metals Research Chinese Academy of Sciences Shenyang 11016 China

We elucidate here the process-structure-property relationships in three-dimensional（3 D） implantable titanium alloy biomaterials processed by electron beam melting（EBM） that is based on the principle of additive manufacturing. The conventional methods for processing of biomedical devices including freeze casting and sintering are limited because of the difficulties in adaptation at the host site and difference in the micro/macrostructure, mechanical, and physical properties with the host tissue. In this regard, EBM has a unique advantage of processing patient-specific complex designs, which can be either obtained from the computed tomography（CT） scan of the defect site or through a computeraided design（CAD） program. This review introduces and summarizes the evolution and underlying reasons that have motivated 3 D printing of scaffolds for tissue *** overview comprises of two parts for obtaining ultimate functionalities. The first part focuses on obtaining the ultimate functionalities in terms of mechanical properties of 3 D titanium alloy scaffolds fabricated by EBM with different characteristics based on design, unit cell, processing parameters, scan speed, porosity, and heat treatment. The second part focuses on the advancement of enhancing biological responses of these 3 D scaffolds and the influence of surface modification on cell-material interactions. The overview concludes with a discussion on the clinical trials of these 3 D porous scaffolds illustrating their potential in meeting the current needs of the biomedical industry.

关键词： Electron beam melting 3D printing tissue engineering mechanical properties biocompatibility

Fatigue behavior of Ti-6Al-4V cellular structures fabricated by additive manufacturing technique

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Journal of Materials Science & Technology 2019年第2期35卷 285-294页

作者： Dechun Ren Shujun Li Hao Wang Wentao Hou Yulin Hao Wei Jin Rui Yang R.devesh K.misra Lawrence E.Murr Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China Department of Metallurgical and Materials Engineering The University of Texas at EI Paso

Porous titanium and its alloys have been considered as promising replacement for dense implants, as they possess low elastic modulus comparable to that of compact human bones and are capable of providing space for in-growth of bony tissues to achieve a better fixation. Recently, the additive manufacturing(AM) method has been successfully applied to the fabrication of Ti-6 Al-4 V cellular meshes and *** to traditional fabrication methods, the AM method offers advantages of accurate control of complex cell shapes and internal pore architectures, thus attracting extensive attention. Considering the long-term safety in the human body, the metallic cellular structures should possess high fatigue *** this paper, the recent progress on the fatigue properties of Ti-6 Al-4 V cellular structures fabricated by the AM technique is reviewed. The various design factors including cell shapes, surface properties, post treatments and graded porosity distribution affecting the fatigue properties of additive manufactured Ti-6 Al-4 V cellular structures were introduced and future development trends were also discussed.

关键词： Ti-6Al-4V cellular structures Additive manufacturing Fatigue behavior

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碳纤维增强固体浮力材料性能研究

功能材料 2018年第8期49卷 8205-8210页

作者：王耀声亚斌周秉文孟令刚 devesh misra 张兴国大连理工大学材料科学与工程学院辽宁省凝固控制与数字化制备技术重点实验室辽宁大连116024 德克萨斯大学埃尔帕索分校冶金与材料工程系美国德克萨斯州79968

使用浓H_2SO_4/浓HNO_3的混酸体系对碳纤维(CF)的表面进行处理得到氧化碳纤维(OCF)。采用超声分散和模具浇注成型法制备氧化碳纤维/空心玻璃微珠(HGMs)/环氧树脂固体浮力材料,研究了材料的密度、抗压强度、吸水率和断面形貌。使用ABAQU... 详细信息

使用浓H_2SO_4/浓HNO_3的混酸体系对碳纤维(CF)的表面进行处理得到氧化碳纤维(OCF)。采用超声分散和模具浇注成型法制备氧化碳纤维/空心玻璃微珠(HGMs)/环氧树脂固体浮力材料,研究了材料的密度、抗压强度、吸水率和断面形貌。使用ABAQUS数值模拟软件,建立了碳纤维增强固体浮力材料的模型,研究了碳纤维对材料应力分布的影响。结果表明,碳纤维经过氧化后,表面形成了羟基和羧基等基团,提高了自身与环氧树脂的界面结合状态。随着氧化碳纤维含量的增加,复合材料的占空比逐渐提高,但密度变化不大,而其抗压强度呈现先升高后降低的趋势。当碳纤维含量为5%(质量分数)时,抗压强度达41MPa,提高约13.8%。固体浮力材料吸水率随碳纤维含量增加而提高,但所有试样的吸水率均小于2%。复合材料模型受压后的应力云图表明,碳纤维能够有效代替固体浮力材料基体承载很大一部分载荷,空心玻璃微珠球壳所受应力降低,减少了空心玻璃微珠破碎和裂纹源的产生,从而对固体浮力材料起到增强作用。

关键词：碳纤维环氧树脂空心玻璃微珠力学性能数值模拟