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Journal of Iron and Steel Research International 2018年第11期25卷 1140-1148页

作者： Hui Zheng Wei Li Yu Gong Li Wang xue-jun jin Institute of Advanced Steels and Materials School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong University Shanghai 200240China State Key Lab of Development and Application Technology of Automotive Steels Baosteel Research Institute Shanghai 201900China

The microstructure-based finite element modeling was conducted to study the mechanical properties of Q&P 980 steel at the microscopic *** two-dimensional representative volume elements of real microstructure were obtained from electron backscattered diffraction ***-Kocks equation was used to predict the constitutive strain-stress relationships of individual ***-induced martensitic transformation takes place when the driving force exceeds the critical driving force according to a stress-invariant-based *** macroscopic stress-strain curves and the work-hardening rate curves obtained from modeling fit well with the experimental *** simulation results also indicate that the local distributions of stress and strain in constituent phases are dependent on their *** ferrite carries the highest strain,while hard mechanical-induced martensite carries the highest *** comparing the modeling results of the microstructures with and without austenite,it shows that the transformation of retained austenite to hard martensite can increase the .work-hardening ability and hence improve the strength and ductility of the *** detailed finite element modeling methods and results are presented and discussed.

关键词： Q&P steel Retained austenite Mechanical property TRIP effect Finite element modeling

Competitive role of film-like austenite and transition carbides on hydrogen embrittlement resistance and impact toughness in bainite-containing quenched and partitioned steel

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Journal of Iron and Steel Research International 2023年第4期30卷 782-794页

作者： Kai Yang Yi Luo Wei Li Li Wang Zhong-qu Sun jun-liang Liu xue-jun jin Bao Steel-SJTU Joint Research Center of Future Steels School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Development and Application Technology of Automotive Steels(Bao Steel) Research Institute(R&D Center)Baoshan Iron&Steel Co.Ltd.Shanghai 200240China

A microstructure composed of martensite matrix,lower bainite,and stable film-like austenite was designed by a quenching and isothermal bainitic holding process in a 0.30C–2.69Mn–1.71Si(wt.%)*** yield strength,tensile strength,and ductile-to-brittle transition temperature(DBTT)of the high-strength steel thus obtained were 1263 MPa,1521 MPa,and-33℃,respectively,and at-20℃,it showed superior low-temperature toughness,which reached 77.5 J/cm^(2).Meanwhile,it showed excellent hydrogen embrittlement(HE)resistance,and the total elongation loss is only 3.1%after 15 min of hydrogen *** excellent comprehensive performance is attributed to the fact that fine stable austenite with film-like morphology hindered the crack nucleation and propagation,and hindered hydrogen diffusion as a hydrogen ***,with a decrease in the isothermal temperature,transition carbide precipitation was accompanied by a further decrease in austenite grain *** this condition,although transition carbides can act as effective hydrogen traps,excessive precipitation decreased the carbon content of retained austenite and increased the deformation heterogeneity between austenite and martensite matrix,leading to weakened austenite stability and HE resistance,a total elongation loss of approximately 39%(15 min hydrogen charging),a sharp decrease in impact toughness,and an increase in *** competitive role of film-like austenite and transition carbides on the comprehensive mechanical performance of steel is revealed,especially the suppression of crack nucleation and propagation that will provide a guide for the design of high strength steels with excellent impact toughness and HE resistance.

关键词： Quenched and partitioned steel Isothermal bainite transformation Transition carbide Hydrogen embrittlement Impact toughness

Tensile behavior and deformation mechanism of quenching and partitioning treated steels at different deforming temperatures

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Journal of Iron and Steel Research International 2017年第11期24卷 1104-1108页

作者： Lian bo Luo Wei Li Yu Gong Li Wang xue-jun jin Institute of Advanced Steels and Materials School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel Research InstituteShanghai 201900China

The effects of deforming temperatures on the tensile behaviors of quenching and partitioning treated steels were investigated. It was found that the ultimate tensile strength of the steel decreased with the increasing temperature from 25 to 100 ℃, reached the maximum value at 300 ℃, and then declined by a significant extent when the temperature further reached 400 ℃. The total elongations at 100, 200 and 300 ℃are at about the same level. The steel achieved optimal mechanical properties at 300 ℃due to the proper transformation behavior of retained austenite since the stability of retained austenite is largely dependent on the deforming temperature. When tested at 100 and 200 ℃, the retained aus tenite was reluctant to transform, while at the other temperatures, about 10 vol. % of retained aus- tenite transformed during the tensile tests. The relationship between the stability of retained austenite and the work hardening behavior of quenching and partitioning treated steels at different deforming temperatures was also studied and discussed in detail. In order to obtain excellent mechanical properties, the stability of retained austenite should be carefully controlled so that the effect of transforma tion-induced plasticity could take place continuously during plastic deformation.

关键词： Quenching and partitioning treated steel Mechanical property Deforming temperature Retained austenite Work hardening behavior

Effects of Sub-zero Celsius Treatment and Tempering on the Stability of Retained Austenite in Bearing Steel

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Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 787-792页

作者： Xiao-Hui Lu Wei Li Cheng-Lin Wang Hong-Shan Zhao xue-jun jin State Key Lab of Metal Matrix Composite School of Materials Science and Engineering Shanghai Jiao Tong University Institute of Advanced Steels and Materials School of Materials Science and Engineering Shanghai Jiao Tong University

In this work, the influence of sub-zero Celsius treatment and tempering on the mechanical and thermal stability of retained austenite in beating steel were assessed by tensile test and DSC. Compared with traditional quenched and tempered treatment, sub-zero Celsius treatment obviously decreases the volume fraction of retained austenite. Moreover, the mechanical stability of retained austenite was enhanced due to the accumulation of compressive stresses in retained austenite after sub-zero Celsius treatment and tempering. Meanwhile, the morphology of retained austenite changed from film-like to blocky with austenitization temperature increasing, and the mechanical stability of film-like retained austenite is higher than that of blocky one. The DSC results showed that the activation energy of retained austenite decomposition slightly increased through sub-zero Celsius treatment and tempering. This result may probably be ascribed to partitioning of carbon during tempering. However, the temperature at which retained austenite starts to decompose is unchanged.

关键词： Bearing steel Sub-zero Celsius treatment Retained austenite Stability

Stability of Retained Austenite Through a Combined Intercritical Annealing and Quenching and Partitioning(IAQP) Treatment

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Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 386-393页

作者： Ri-Ming Wu Wei Li Cheng-Lin Wang Yi Xiao Li Wang xue-jun jin School of Materials Science and Engineering Shanghai Jiao Tong University School of Materials Science and Engineering Shanghai University State Key Lab of Development and Application Technology of Automotive Steels Baosteel Research Institute

Intercritical annealing（IA） at various temperatures followed by quenching and partitioning（IAQP） treatments was conducted on a cold-rolled Fe-0.2C-1.42Si-l.87Mn（wt%） sheet *** microstructure and enhanced mechanical properties were achieved through appropriate adjustment of IA *** steel which was annealed at1,033 K for 600 s,then quenched to 573 K and partitioned at 693 K for 20 min,designated as 1033 QP steel,exhibits maximum 16.3 vol% retained austenite（RA） with good mechanical properties（ultimate tensile strength 886 MPa and total elongation 27%）.It was found that the thermal and mechanical stabilities of RA are mainly influenced by the combined effect of its average carbon content and amount of adjacent ***,the transformation-induced plasticity effect increased the peak n-values observed at the second stage of the work hardening of IAQP steels.

关键词： Intercritical annealing and quenching and partitioning treatment(IAQP) Retained austenite(RA) Average carbon content(ACC) Amount of adjacent martensite(AAM) Transformation-induced plasticity(TRIP)

Improving hydrogen embrittlement resistance of a modified press hardening steel by introducing retained austenite as hydrogen trap

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Journal of Iron and Steel Research International 2022年第11期29卷 1864-1872页

作者： Wei Ding Kai Yang Yu Gong Li Wang Ji-yao Hong Wei Li xue-jun jin Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China Institute of Advanced Steels and Materials School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Development and Application Technology of Automotive Steels BaoSteel Research InstituteShanghai 201900China

The effect of retained austenite(RA)with higher mechanical stability on hydrogen embrittlement resistance of a modified 22MnB5(C 0.22,Si 0.8,Mn 1.5,B 0.002,Fe balance,in wt.%)press hardening steel(PHS)has been ***-step quenching and partitioning(Q&P)treatment was applied to PHS,and around 6 vol.%ultra-fine RA was *** ultra-fine RA was found to act as stronger hydrogen trap than dislocations and grain boundaries in martensitic matrix and can decrease the apparent diffusion coefficient of hydrogen from 5.97×10^(-7) to 3.83×10^(-7) cm^(2) s^(-1),which was verified by the combination of thermal desorption spectroscopy analysis and hydrogen permeation *** higher mechanical stability of the ultrafine RA assures enough stability of the hydrogen trap,which results in better hydrogen embrittlement resistance in Q&P-treated PHS than the conventional directly quenched PHS.

关键词： Hydrogen embrittlement Press hardening steel Quenching and partitioning Retained austenite Thermal desorption spectroscopy Hydrogen permeation

An optimization of harmonic structure nickel-saving cryogenic steel via combinatorial high-throughput experiment

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Journal of Iron and Steel Research International 2023年第5期30卷 1042-1049页

作者： Xing-qi Jia Feng-hua Lu Kai Yang Shi-long Liu Chun Yu Wei Li xue-jun jin Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106JiangsuChina

A combinatorial high-throughput experiment(HTE)was used to optimize composition and process of nickel-saving cryogenic steel.A gradient temperature heat treatment method with a high linear distribution of heat treatment temperature using customized graphite sleeve direct current heating was used in the combinatorial HTE,which enhanced the richness of the sample library for the single preparation of the 10^(2) level component process *** steel with excellent mechanical properties was optimized using this combinatorial HTE,and the Ni content was reduced from the traditional 9 to 5.6 wt.%by using Mn instead of *** heterogeneous structure architecture strategy and strengthening and toughening mechanism of the harmonic structure induced by intrinsic heat treatment of additive manufacturing were *** the composition process optimization of Ni-saving cryogenic steel as an example,the boosting ability of combinatorial HTE in the research and development of new metal materials was proposed.

关键词： High-throughput experiment Laser metal deposition Gradient heat treatment Cryogenic steel Heterogeneous structure

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

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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

Microstructural Characterization of Welded Joint in Duplex Stainless Steel by Laser Continuous Heat Treatment

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Journal of Iron and Steel Research International 2014年第7期21卷 710-714页

作者： He-ping LIU Bin LIU Da-zhao LI Hu-er SUN Feng-er SUN xue-jun jin School of Materials Science and Engineering North University of China School of Materials Science and Engineering Shanghai Jiao Tong University

Microstructural characterization in fusion zone of the laser continuous heat treatment welded joint was in vestigated. The results showed that the martensite-like microstructure is the face centered cubic （FCC） crystal structure so that it can be identified as the secondary austenite. The dislocation is observed inside and outside the seconda ry austenite, whereas inclusion is not found in the vicinity of the secondary austenite. In the fusion zone, there is a kind of carbide precipitate which is identified as M23 C6 by the means of transmission electron microscope （TEM）. The carbide precipitate is a representative mode of transformation, which can be generated by the eutectoid reaction. Furthermore, the formation mechanisms of the secondary austenite and chromium carbide are analyzed.

关键词： fusion zone continuous heat treatment characterization secondary austenite carbide

Targeting cholesterol trafficking to mitigate axonal degeneration in hereditary spastic paraplegia

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Neural Regeneration Research 2025年第5期20卷 1397-1398页

作者： Zhenyu Chen xue-jun Li Department of Biomedical Sciences University of Illinois College of Medicine RockfordRockfordILUSA Department of Bioengineering University of Illinois at ChicagoChicagoILUSA

Axonal degeneration underlies many debilitating diseases including hereditary spastic paraplegia(HSP),a genetically and clinically diverse group of disorders characterized by spasticity and weakness of the lower *** is one significant cause of chronic neurodisability due to the lack of effective treatments and a wide range of onset ages from early childhood to 70 years.

关键词： degeneration diseases hereditary