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Effect of tempering on carbides and hydrogen embrittlement in E690 high strength marine structural steel

Journal of Iron and Steel Research International 2022年第10期29卷 1669-1682页

作者： Yi Luo Wei Li Peng-wei Zhou Yuan-tao Xu Hui-yong Pang Ning Zhong Hui-sheng Jiao Xue-jun Jin Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Institute of Advanced Steels and Materials School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China China Wuyang Iron and Steel Co. Ltd.Pingdingshan462500HenanChina School of Materials Science and Engineering Shanghai Maritime UniversityShanghai200120China TESCAN CHINA Shanghai200240China

The effect of tempering on carbides and hydrogen embrittlement in E690 high strength marine structural steel has been *** steel was tempered at 600℃ for 1–3 *** characterization was carried out to characterize the microstructure,especially the dislocation density and grain *** hydrogen permeation test and thermal desorption spectroscopy test were also *** dislocation density decreases,the amount of carbide increases,and carbides(M_(23)C_(6) and MX)coarsen with the tempering time *** tempered at 600℃ for 3 h,the diffusible hydrogen trapped by lattice and dislocation decreases while the non-diffusible hydrogen trapped by carbides increases,leading to the best hydrogen embrittlement resistance,although hydrogen diffuses rapidly due to the reduction of dislocation *** the fracture mode changes from a combination of brittle cleavage and ductile dimpled fracture to fully ductile dimple fracture under hydrogen charging ***,a phenomenon that hydrogen accelerates the dislocations movement of the steel during deformation was observed,which is related to the fact that hydrogen enhanced localized plasticity mechanism.

关键词： High strength marine structural steel Carbide tempering Hydrogen embrittlement Thermal desorption spectroscopy

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Evolution of microstructures and mechanical properties with tempering temperature of a pearlitic quenched and tempered steel

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Journal of Iron and Steel Research International 2022年第9期29卷 1393-1403页

作者： De-zhen Yang Zhi-ping Xiong Chao Zhang Guan-zheng Feng Zhifang Cheng Xing-wang Cheng School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China National Key Laboratory of Science and Technology on Materials under Shock and Impact Beijing 100081China

Instead of conventional quenching and tempering,fast austenitization from an initial microstructure of lamellar pearlite followed by quenching and tempering was carried out,leading to the formation of inhomogeneous *** comprised different morphologies of lath martensite and retained austenite(RA).The effect of tempering temperature on microstructure evolution and tensile properties was systematically *** increasing tempering temperature from 150 to 250℃,transition carbides gradually coarsened and their amount increased,the dislocation density in martensitic laths gradually decreased,and RA fraction decreased from 10.9%to 2.2%.The precipitation and dislocation strengthening can ensure a high strength,while RA can ensure a good ductility,leading to a simultaneous increase in the strength and ductility when decreasing tempering ***,the best combination of tensile properties(ultimate tensile strength of 2133±41 MPa and total elongation of 11.1%±1.3%)was achieved after tempering at 150℃.

关键词： Fast austenitization Pearlite tempering Manganese Mechanical property

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Numerical Simulation of Stress Field in Physical tempering Process of Flat Soda Lime Silica Glass

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 20-30页

作者：刘超英 HE Dongsheng OU Yingchun HE Feng HAO Lizi XU Shaokun MA Juanrong China Building Materials Academy Beijing 100024China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China China Helicopter Research and Development Institute Jingdezhen 333001China

Based on the analysis of different theory for glass tempering process,the“structural theory”with stress relaxation and structural relaxation effects was selected to investigate the tempering of flat glass *** geometrical model with small size and non-homogeneous mesh were considered to build the finite element models according to the characteristics of stress *** tempering process of flat glass with12 mm thickness was calculated with the verified finite element *** transient and permanent stress of the central area,edge and corner end of the flat glass are obtained and *** the calculation results of basic case,the transient tensile stress at the upper surface of the central area,the center point of edge,the edge of edge,the edge of corner were 14.30,18.94,40.76 and 34.75 MPa,*** transient tensile stress at these points were dangerous to promote the glass to break during the *** addition,the point at the diagonal line of symmetry plane in the thickness direction,which is 14 mm from corner,has the maximum permanent tensile stress about 70.01 MPa in the flat glass after ***,it is indicated that the corner is the weakest region in the tempered glass.

关键词： nite element tempering stress relaxation structural relaxation compressive stress tensile stress

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Universality of quenching-partitioning-tempering local equilibrium model

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Journal of Materials Science & Technology 2022年第29期124卷 116-120页

作者： J.Z.Zhang L.Y.Zeng X.W.Zuo J.F.Wan Y.H.Rong N.Min J.Lu N.L.Chen Department of Mechanical Engineering City University of Hong KongGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceTat Chee AvenueKowloonHong KongChina Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Laboratory for Microstructures Shanghai UniversityShanghai 201900China CityU-Shenzhen Futian Research Institute Shenzhen 518045China

*** As typical 3rd generation advanced high strength steels(AHSSs),quenching and partitioning(Q&P)steel has attracted lots of attention for excellent performance in strength-ductility[1–5].With absorbing carbon partitioning as the core idea of Q&P process,quenching-partitioning-tempering(Q-P-T)process was proposed with emphasis on precipitation strengthening for better combination of strength and ductility[6–10].

关键词： tempering strength ductility

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tempering Behavior of Ductile 1700 MPa Mn-Si-Cr-C Steel Treated by Quenching and Partitioning Process Incorporating Bainite Formation

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Journal of Materials Science & Technology 2015年第2期31卷 199-204页

作者： Guhui Gao Han Zhang Xiaolu Gui Zhunli Tan Bingzhe Bai Materials Science & Engineering Research Center Beijing Jiaotong University Max-Planck-Institut für Eisenforschung Max-Planck-Str.1Düsseldorf 40237Germany Key Laboratory of Advanced Materials Department of Material Science & EngineeringTsinghua University

We obtained a good combination of strength and ductility in a 0.4C-2.0Mn-1.7Si-0.4Cr（wt%） steel,namely,;.7 GPa of ultimate tensile strength and;6% of elongation,by conducting a Q-P-T（quenching-partitioning- tempering） process incorporating the formation of carbide-free bainite. The tempering behavior of this steel was discussed by using experimental finding(scanning electron microscopy,X-ray diffraction（XRD）,transmission electron microscopy and dilatometer) and CCE（constrained carbon equilibrium） modeling. The XRD results combined with CCE calculation prove that carbon partitioning from martensite to austenite occurs during tempering. Consequently,the thermodynamic stability of retained austenite is enhanced. This idea can be utilized to design novel Q-P-T processes in future.

关键词： Bainite Quenching and partitioning tempering Micro

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tempering stability of Fe–Cr–Mo–W–V hot forging die steels

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1145-1157页

作者： Yuan-ji Shi Xiao-chun Wu Jun-wan Li Na Min School of Materials Science and Engineering Shanghai University Shanghai 200072 China

The tempering stability of three Fe–Cr–Mo–W–V hot forging die steels(DM, H21, and H13) was investigated through hardness measurements and transmission electron microscopy(TEM) observations. Both dilatometer tests and TEM observations revealed that DM steel has a higher tempering stability than H21 and H13 steels because of its substantial amount of M_2C(M represents metallic element) carbide precipitations. The activation energies of the M_2C carbide precipitation processes in DM, H21, and H13 steels are 236.4, 212.0, and 228.9 kJ/mol, respectively. Furthermore, the results indicated that vanadium atoms both increase the activation energy and affect the evolution of M_2C carbides, resulting in gradual dissolution rather than over-aging during tempering.

关键词： tempering stability hot forging die steels carbide precipitation

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tempering microstructure and mechanical properties of pipeline steel X80

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中国有色金属学会会刊：英文版 2009年第S3期19卷 573-578页

作者：牛靖齐丽华刘迎来马蕾冯耀荣张建勋 Xi'an Tubular Goods Research Center of China National Petroleum Corporation School of Materials Science and Engineering Xi'an Jiaotong University School of Materials Science and Engineering Xi’an Jiaotong University

The tempering microstructure and mechanical properties of X80 steel used for heating-bent pipe were analyzed. The results show that the microstructure of X80 steel tempered at 550 ℃ and 600 ℃ is bainitic ferrite (BF)+granular bainite (GB), and partial ferrite laths in BF merge and broaden. The interior sub-lath boundary of some GB begins to disappear due to merging, the M/A constituent (a mixture of martensite plus retained austenite) in GB is orbicular. At the two tempering temperatures the tested X80 steel shows a certain degree of tempering stability. After being tempered at 650 ℃, the microstructure of X80 steel is GB+quasi-polygonal ferrite(QF), and the original BF laths have merged to form smaller GB crystal grains. The reason is that the steel shows better match of strength and toughness. After being tempered at 700 ℃ , the microstructure of X80 steel is composed mainly of QF, which can improve the plasticity but decline severely the yield strength of X80, and the M/A constituent assembles and grows up at the grain boundary of QF, resulting in excellent lower low-temperature toughness of X80.

关键词： X80 steel microstructure tempering temperature mechanical property

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tempering Behavior of 4.5Cr-2W-0.25V Steel

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Journal of Iron and Steel Research International 2010年第10期17卷 57-62页

作者： Mohsen Asadi Asadabad Shahram Kheirandish Abdul Javad Novinrooz Department of Materials Science and Metallurgical Engineering Iran University of Science and Technology Advanced Materials Group Materials Research School Center of Excellence for Advanced Materials and Processing

The tempering behavior of a Cr-W-V steel was investigated in this research. This new alloy with the com- position of Fe-4.5Cr-2W-0. 25V-0. 1C was austenitized at 1 000 ℃ for 30 rain and tempered at 600 and 700 ℃ for dif- ferent time up to 100 h. An OM analysis of the microstructure of air cooled and water quenched specimens before tempering showed that although under both conditions fully martensitic matrix formed, finer structure had formed in the water quenched specimens. The XRD and TEM results showed that the most stable carbides formed during tempering of the steel were M23C6 and M7C3, respectively. Other carbides such as M3C and M2C, formed in the first stages of tempering, and stable MC were also observed. The results showed that when the tempering time, tempera- ture and cooling rate were increased, mass percent of extracted precipitates was increased. In addition, the formation rate of the stable carbides such as M23 Cs and dissolution rate of the metastable carbides such as M3C and M2C were increased.

关键词： Cr-W-V steel carbide tempering TEM XRD

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tempering Behavior of M50 Steel with Different Austenite Proportion Induced by High Current Pulsed Electron Beam

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稀有金属材料与工程 2012年第S1期41卷 475-477页

作者： G.E.Ozure Institute of High Current Electronics 4Academichesky Av.Tomsk 634055Russia

M50 steel was irradiated by high current pulsed electron beam(HCPEB)with different *** subsequent tempering was carried out between 500 and 625℃.Microstructure evolution was analyzed by scanning electron microscopy and X-ray *** is found that the HCPEB treatment could constrain martainsite transformation in the surface layer of the *** behavior of HCPEB remelted layer strongly depends on the proportion of retained *** saturated more carbon and metallic elements depict higher tempering *** tempered process,carbides precipitates among the grain and phase *** decreased solution of the elements promotes the retained austenite into martensite.

关键词： electron beam irradiation M50 steel tempering microstructure

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Microstructure evolution and mechanical properties of PESR 55Cr17Mo1VN plastic die steel during quenching and tempering treatment

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Journal of Iron and Steel Research International 2021年第12期28卷 1625-1633页

作者： Cong-peng Kang Fu-bin Liu Huai-bei Zheng Hua-bing Li Zhou-hua Jiang Kui Chen Hao-yang Suo Xin-hao Yu School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114002LiaoningChina

55Cr17Mo1VN high nitrogen martensitic stainless steel is usually applied to the high-quality mold,which is largely produced by the pressurized electro slag remelting *** microstructure evolution of quenching and tempering heat treatment were investigated and an optimal heat treatment process to achieve excellent mechanical properties was found *** main precipitates in the steel included carbon-rich type M_(23)C_(6) and nitrogen-rich type M_(2)*** increasing austenitizing temperature,the equivalent diameter of the precipitates got fined,and retained austenite content increased significantly when the austenitizing temperature exceeded 1020℃.The fracture mode gradually changed from brittle fracture to ductile fracture with increasing tempering temperature from 200 to 550℃.The experimental steel tempered at 350℃ achieved a good combination of hardness(60.6 HRC)and strength(2299.2 MPa)to meet service *** M_(23)C_(6) precipitated along martensite lath boundaries and the secondary hardening phenomenon occurred when the tempering temperature was 450℃.Due to the high nitrogen content,M_(2)N precipitated from the inside of laths and matrix when tempered at 550℃.

关键词： Microstructure Mechanical property Plastic die steel Quenching tempering Precipitate

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