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Cu-assisted austenite reversion and enhanced trip effect in maraging stainless steels

Journal of Materials Science & Technology 2022年第9期104卷 52-58页

作者： M.C.Niu K.Yang J.H.Luan W.Wang Z.B.Jiao School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-changxu Innovation Center for Advance Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Materials Science and Engineering City University of Hong KongHong KongChina The Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenGuangdongChina

Control of the formation and stability of reverted austenite is critical in achieving a favorable combination of strength,ductility,and toughness in high-strength *** this work,the effects of Cu precipitation on the austenite reversion and mechanical properties of maraging stainless steels were investigated by atom probe tomography,transmission electron microscopy,and mechanical *** results indicate that Cu accelerates the austenite reversion kinetics in two manners:first,Cu,as an austenite stabilizer,increases the equilibrium austenite fraction and hence enhances the chemical driving force for the austenite formation,and second,Cu-rich nanoprecipitates promote the austenite reversion by serving as heterogeneous nucleation sites and providing Ni-enriched chemical conditions through interfacial *** addition,the Cu precipitation hardening compensates the strength drop induced by the formation of soft reverted *** tensile deformation,the metastable reverted austenite transforms to martensite,which substantially improves the ductility and toughness through a transformation-induced plasticity(trip)*** Cu-added maraging stainless steel exhibits a superior combination of a yield strength of~1.3 GPa,an elongation of~15%,and an impact toughness of~58 J.

关键词： Maraging stainless steel trip effect Austenite reversion Cu-rich nanoprecipitate

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effect of Thermomechanical Control Processing on Microstructure and Mechanical Properties of Fe-0.2C-1.44Si-1.32Mn Hot Rolled trip Steel

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Journal of Iron and Steel Research International 2010年第7期17卷 44-50页

作者： ZHANG Zi-cheng ZHU Fu-xian LI Yan-mei State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The effect of thermomechanical control processing（TMCP）on microstructure and mechanical properties of Fe-0.2C-1.44Si-1.32Mn hot rolled trip steel was investigated through ***-induced transformation and transformation-induced plasticity behavior of retained austenite were *** results show that with multipass deformation,reduction per pass of more than critical deformation in austenite recrystallization region and total reduction of more than 58% in non-recrystallization region and high temperature section of two-phase region,austenite can be refined before γ→α *** is beneficial to obtain refined ferrite grain in final *** obtain fine and uniform microstructure and excellent strength-ductility balance,a three-stage cooling process（laminar cooling-air cooling-ultra-fast cooling）after hot rolling was *** ultimate tensile strength and elongation of the investigated steel can reach 663 MPa and 41%,respectively.

关键词： hot rolled trip steel trip effect retained austenite transformation-induced plasticity mechanical property

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effect of Controlled Cooling After Hot Rolling on Mechanical Properties of Hot Rolled trip Steel

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Journal of Iron and Steel Research International 2008年第2期15卷 65-70页

作者： WU Di LI Zhuang LU Hui-sheng State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Department of Material Engineering Shenyang Institute of Aeronautical Engineering Shenyang 110034 Liaoning China Department of Science and Technology Information China Iron and Steel Research Institute Group Beijing 100081 China

A three-step cooling pattern on the runout table（ROT）was conducted for the hot rolled trip *** evolution during thermomechanical controlled processing（TMCP）was *** condition of controlled cooling on a ROT in the laboratory rolling mill was *** results indicated that the microstructure containing polygonal ferrite,granular bainite and a significant amount of the stable retained austenite can be obtained through three-step cooling on the ROT after hot *** led to ferrite grain *** cooling after hot rolling resulted in the stability of the remaining austenite and a satisfactory trip *** mechanical properties were obtained through TMCP for the hot rolled trip steel.

关键词： hot rolled trip steel three-step cooling trip effect mechanical property

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effect of Cooling Method on Microstructure and Mechanical Properties of Hot-Rolled C-Si-Mn trip Steel

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Journal of Iron and Steel Research International 2012年第1期19卷 41-46页

作者： LIU Ji-yuan ZHANG Zi-cheng ZHU Fu-xian LI Yan-mei Manabe Ken-ichi State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110004LiaoningChina Department of Mechanical Engineering Tokyo Metropolitan UniversityTokyo 192-0397Japan

The controlled cooling technology following hot rolling process is a vital factor that affects the final micro- structure and mechanical properties of the hot-rolled transformation induced plasticity （trip） steels. In the present study, low alloy C-Si-Mn trip steel was successfully fabricated by hot rolling process with a 4450 hot roiling mill. To maximize the volume fraction and stability of retained austenite of the steel, two different cooling methods （aircooling and ultra-fast cooling ＂AC-UFC＂ and ultrmfast cooling, air cooling and ultra-fast cooling ＂UFC-AC-UFC＂） were conducted. The effects of the cooling method on the microstructure of hot-rolled trip steel were investigated via optical microscope, transmission electron microscope and conversion electron Mossbauer spectroscope. The mechanical properties of the steel were also evaluated by conventional tensile test. The results indicated that ferrite and bainite in the microstructure were refined with the cooling method of UFC-AC-UFC. The morphology of retained austenite was also changed from small islands distributing in bainite district （obtained with AC-UFC） to granular shape locating at the triple junction of the ferrite grain boundaries （obtained with UFC-AC-UFC）. As a result, the trip steel with a content of retained austenite of 11. 52%, total elongation of 32% and product of tensile strength and total elongation of 27 552 MPa·% was obtained.

关键词： hot-rolled trip steel retained austenite trip effect Mossbauer spectra mechanical property

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Influences of Thermal Martensites and Grain Orientations on Strain-induced Martensites in High Manganese trip/TWIP Steels

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Journal of Materials Science & Technology 2011年第3期27卷 257-265页

作者： Fayun Lu Ping Yang Li Meng Fenge Cui Hua Ding School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China College of Materials and Metallurgy Northeastern University Shenyang 110004 China

Strain-induced martensites in high manganese trip/TWIP steels were investigated in the presence of thermal martensites and under the influence of austenitic grain orientation by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and electron backscattered diffraction （EBSD）. Before deformation, the morphology of α＇- M depended mainly on the number of variants and growing period. Regardless of martensite morphologies and deformation, the Kurdjumov-Sachs （K-S） orientation relationships always maintained. The 6 α＇-M variants formed from a plate of ε-M were of 3 pairs of twins with a common axis 〈110〉α＇ parallel to the normal of {112}γ habit plane to minimize transformation strain. When α＇-M could be formed only by deformation, it nucleated at the intersection of ε-M variants and grew mainly in thick ε-M plates. Thick ε plates promoted significantly the α＇-M and weakened the influence of grain orientations. During tension, the transformation in 〈100〉-oriented grains was observed to be slower than that in 〈121〉-oriented grains. Deformation twins promoted ε-M formation slightly and had no apparent effect on α＇-M. Deformation increased the number of ε-M variants, but reduced that of α＇-M variants.

关键词： High manganese steel Martensite trip effect Orientation relationship Electron backscattered diffraction (EBSD)

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Microstructure and mechanical properties of a cast trip-assisted multiphase stainless steel

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China Foundry 2024年第3期21卷 221-228页

作者： Meng-xin Wang Zi-xiang Wu Jing-yu He Xiang Chen School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China

Stainless steels are used in a wide range of complex environments due to their excellent corrosion *** stainless steels can offer an excellent combination of strength,toughness and corrosion resistance due to the coexistence of different *** microstructure and mechanical properties of a novel cast multiphase stainless steel,composed of martensite,ferrite,and austenite,were investigated following appropriate heat treatment processes:solution treatment at 1,050℃ for 0.5 h followed by water quenching to room temperature,and aging treatment at 500℃ for 4 h followed by water quenching to room *** show reversed austenite is formed by diffusion of Ni element during aging process,and the enrichment of Ni atoms directly determines the mechanical stability of *** austenite with a lower Ni content undergoes a martensitic transformation during plastic *** tensile strength of the specimen exceeds 1,100 MPa and the elongation exceeds 24%after solid solution,and further increases to 1,247 MPa and 25%after aging *** enhancement is due to the trip effect of austenite and the precipitation of the nanoscale G-phase pinning dislocations in ferrite and martensite.

关键词： multiphase stainless steel mechanical properties trip effect reversed austenite G-phase

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effects of Warm Deformation on Mechanical Properties of trip Aided Fe-C-Mn-Si Multiphase Steel

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Journal of Iron and Steel Research International 2012年第6期19卷 47-52页

作者： TIAN Yong LI Zhuan~ State Key Laboratory of Roiling and Automation Northeastern University Shenyang 110004 LiaoningChina Department o{ Material Engineering Shenyang Institute of Aeronautical Engineering Shenyang110034 Liaoning China）

Warm deformation tests were performed using a kind of tubby heater. The microstructures and mechanical properties of an Fe-C-Mn-Si multiphase steel resulting from different warm deformation temperatures were investiga- ted by using LOM （light optical microscopy）, SEM and XRD. The results indicated that the microstructure contai- ning polygonal ferrite, granular bainite and a significant amount of the stable retained austenite can be obtained through hot deformation and subsequent austempering. Warm deformation temperature affects the mechanical prop- erties of the hot rolled trip steels. Ultimate tensile strength balance reached maximum （881 MPa） when the speci- men was deformed at 250 ~C, and the total elongation and strength-ductility reached maximum （38% and 28 614 MPa ~ ~, respectively） at deforming temperature of 100 ~C. Martensite could nucleate when austenite was deformed above M~, because mechanical driving force compensates the decrease of chemical driving force. The trip effect occurs in the Fe-C-Mn-Si multiphase steel at deforming temperature ranging from 15 to 350 ~C. The results of the effects of warm deformation on the mechanical properties of the Fe-C-Mn-Si multiphase steel can provide theoretical basis for the ap- plications and the warm working of the hot rolled trip sheet steels in industrial manufacturing.

关键词： warm deformation Fe-C-Mn-Si multiphase steel trip effect mechanical property

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Fatigue of 0.55C-1.72Si Steel with Tempered Martensitic and Carbide-Free Bainitic Microstructures

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Acta Metallurgica Sinica(English Letters) 2014年第1期27卷 55-62页

作者： Alejandro Leiro Arash Roshan Karl-Gustaf Sundin Esa Vuorinen Braham Prakash Department of Engineering Sciences and Mathematics Lule University of Technology

High-Si spring steel was heat treated in three different ways： Quenching and tempering at 460 ℃ to obtain a tempered martensite microstructure, and austempering at 300 and 350 ℃, respectively, to obtain two different carbide-free bainitic microstructures. In the steel austempered at 350 ℃, both the bainite lath thickness and retained austenite content were higher than those of the steel austempered at 300 ℃. Rotating-bending fatigue tests were done in order to evaluate the effect of each heat treatment on the high-cycle fatigue behavior of the steel. When the austempering temperature was 300 ℃, the endurance limit was increased by 25% despite a 5% reduction in tensile strength when compared with that of the quenched and tempered steel. The relationship between endurance limit [Rfat （50~）] and ultimate tensile strength （Rm） was higher for the austempered samples in comparison with that of the quenched and tempered material. Therefore, it is believed that the presence of retained austenite affects the relationship between endurance limit and tensile strength.

关键词： Steels Fatigue Carbide-free bainite trip effect

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Work Hardening Behavior and Stability of Retained Austenite for Quenched and Partitioned Steels

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Journal of Iron and Steel Research International 2016年第2期23卷 130-137页

作者： Cun-yu WANG Ying CHANG Jie YANG Wen quan CAO Han DONG Yi-de WANG Central Iron and Steel Research Institute Beijing 100081China Taiyuan Iron and Steel Group Co. Ltd.Taiyuan 030003ShanxiChina National Key Laboratory of Industrial Equipment Structural Analysis School of Automotive EngineeringDalian University of TechnologyDalian 116024LiaoningChina Society of Automotive Engineers of China Beijing 100055China

Both microstrueture and mechanical properties of low alloy steels treated by quenching and partitioning （Q＆P） process were examined. The mixed microstructure of martensite and large-fractioned retained austenite （about 27.3%） was characterized and analyzed, excellent combinations of total elongation of 19% and tensile strength of 1 835 MPa were obtained, and three-stage work hardening behavior was demonstrated during tensile test. The en hanced mechanical properties and work hardening behavior were explained based on the transformation induced plas ticity effect of large fractioned austenite.

关键词： Q&P process work hardening retained austenite martensite mechanical property trip effect

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effects of Mn and Cr contents on microstructures and mechanical properties of low temperature bainitic steel

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Journal of Iron and Steel Research International 2017年第3期24卷 290-295页

作者： Hui Guo Peng Zhou Ai-min Zhao Chao Zhi Ran Ding Jia-xing Wang Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing Beijing 100083 China Institute of Engineering Research University of Science and Technology Beijing Beijing 100083 China

The effects of Mn and Cr contents on bainitic transformation kinetics,microstructures and mechanical properties of high-carbon low alloy steels after austempered at 230,300 and 350 ℃ were determined by dilatometry,optical microscopy,scanning electron microscopy,X-ray diffraction and tensile tests. The results showed that Mn and Cr can extend bainitic incubation period and completion time,and with the increase of Mn and Cr content,the bainitic ferrite plate thickness decreased and the volume fraction of retained austenite increased. trip（ transformation induced plasticity） effect was observed during tensile testing which improved the overall mechanical property. The increase of Mn concentration can improve the strength to a certain extent,but reduce the ductility. The increase of Cr concentration can improve the ductility of bainitic steels which transformed at a low temperature. The low temperature bainitic steel austempered at 230 ℃ exhibited excellent mechanical properties with ultimate tensile strength of（ 2146 ± 11） MPa and total elongation of（ 12. 95 ± 0. 15） %.

关键词： Low temperature bainitic steel Kinetics Retained austenite trip effect

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