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Size Effect of Impact Abrasive Particles on Wear and Surface Hardening Behavior of high‑manganese steel

Acta Metallurgica Sinica(English Letters) 2023年第6期36卷 906-916页

作者： Yongjin Wang Chuansongxin Song Renbo Song Zetian Ma Tom Taylor School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Swansea University Swansea SA18EPUK

The size effect of impact abrasive particles on wear and surface hardening behavior of high-manganese steel was studied.Impact wear tests were carried out on MLD-10 tester with abrasive particle sizes of 6.0–0.75 mm,respectively.The results showed that the impact wear behavior and surface hardening mechanism of high-manganese steel were affected by the size of abrasive particles.A critical size of abrasive particle might exhibit to distinguish the impact wear behavior.When the abrasive particle size was larger than 0.75 mm,the wear mass loss generally showed a decreasing trend with the decrease of the abrasive particle size.Dislocation strengthening and mechanical twinning contributed to the good work hardening behavior.However,effective surface hardening layer could not be formed for sample tested with particle size of 0.75 mm and the wear mass loss was the highest among all the conditions.The weak hardening effect led to the sharp increase of the wear mass loss.Press-in abrasives could be observed on the wear surface when the abrasive particle size was larger than 0.75 mm.The press-in abrasives were peeled off from the wear surface and broken,leaving deep grooves and peeling pits.Material exchange with the sample would occur with the flow of abrasives.A large area of furrow was formed on the wear surface.For particle size of 0.75 mm,aggregated abrasives formed a dynamic buffer layer on the surface and the stress distribution was more even.The formation of buffer layer would lower the effect of the impact load and the work hardening effect could not be fully activated.The mutual extrusion among the abrasives,friction wheel and sample caused plastic deformation of the worn surface during impact test.The present study would help guiding to select the application field of high-manganese steel more precisely.

关键词： Abrasive particles Three-body impact wear high-manganese steel Wear mechanism Surface hardening behavior

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Observation of the Hydrogen-Dislocation Interactions in a high-manganese steel after Hydrogen Adsorption and Desorption

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Acta Metallurgica Sinica(English Letters) 2023年第7期36卷 1105-1112页

作者： Dayong An Yuhao Zhou Yao Xiao Xinxi Liu Xifeng Li Jun Chen Department of Plasticity Technology School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200030China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China

Hydrogen embrittlement(HE)poses a significant challenge for the development of high-strength metallic materials.However,explanations for the observed HE phenomena are still under debate.To shed light on this issue,here we investigated the hydrogen-defect interaction by comparing the dislocation structure evolution after hydrogen adsorption and desorption in a Fe-28Mn-0.3C(wt%)twinning-induced plasticity steel with an austenitic structure using in situ electron channeling contrast imaging.The results indicate that hydrogen can strongly affect dislocation activities.In detail,hydrogen can promote the formation of stacking faults with a long dissociation distance.Besides,dislocation movements are frequently observed during hydrogen desorption.The required resolved shear stress is considered to be the residual stresses rendered by hydrogen segregation.Furthermore,the microstructural heterogeneity could lead to the discrepancy of dislocation activities even within the same materials.

关键词： Hydrogen embrittlement Stacking fault Dislocation movement high-manganese steel Electron channeling contrast imaging(ECCI)

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Tensile deformation behavior of nickel-free high-manganese austenitic cryogenic-temperature steel

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Journal of Iron and steel Research(International) 2022年第5期29卷 793-801页

作者： Xin-tian Wang Hui-bin Wu Yang Gu Li-xiong Xu Peng-cheng Zhang Qi-bo Tang National Center for Materials Service Safety University of Science and Technology BeijingBeijing100083China Collaborative Innovation Center of steel Technology University of Science and Technology BeijingBeijing100083China

Nickel-free high-manganese austenitic Fe–24.4Mn–4.04Al–0.057C steel was produced by smelting,and the homogenized forged billet was hot-rolled.The plastic deformation mechanism was investigated through tensile testing of the hot-rolled sample.Different characterization techniques such as scanning electron microscopy,transmission electron microscopy,electron backscattered diffraction,and X-ray diffraction were used to analyze the microstructural evolution of steel under different strain levels.The steel had a single austenite phase,which was stable during deformation.After hot rolling,annealing twins were observed in the microstructure of the steel.The steel showed an excellent combination of mechanical properties,like a tensile strength of 527 MPa,impact energy of 203 J at−196℃,and an elongation of 67%till fracture.At the initial deformation stage,the dislocations were generated within the austenite grains,entangled and accumulated at the grain boundaries and annealing twin boundaries.Annealing twins participated in plastic deformation and hindered the dislocation movement.As the deformation progressed,the dislocation slip was hindered and produced stress concentration,and the stacking faults evolved into mechanical twins,which released the stress concentration and delayed the necking.

关键词： high-manganese steel Austenite grain Tensile deformation Mechanical twin Annealing twin

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Unusual relationship between impact toughness and grain size in a high-manganese steel

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Journal of Materials Science & Technology 2021年第30期89卷 122-132页

作者： Pan Xie Shucheng Shen Cuilan Wu Jiehua Li Jianghua Chen Center for high Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha410082China Institute of Casting Research Montanuniversität LeobenA-8700LeobenAustria

The high-manganese steels are important structural materials,owing to their excellent toughness at low temperatures.However,the microstructural causes for their unusual properties have not adequately been understood thus far.Here,we report a reversal relationship between impact toughness and grain size in a high-manganese steel and its unrevealed microscopic mechanisms,which result in an excellent low-temperature toughness of the steel.Our investigations show that with increasing grain size the impact toughness of the steel can be improved drastically,especially at low-temperatures.Advanced electron microscopy characterization reveals that the enhanced impact toughness of the coarse-grained steel is attributed to the twinning induced plasticity and transformation induced plasticity effects,which produce large quantities of deformation twins,ε_(hcp)-martensite andα'_(bcc)-martensite.Inversely,in the fine-grained steels,the formation of deformation twins and martensite is significantly inhibited,leading to the decrease of impact toughness.Microstructural characterizations also indicate thatε_(hcp)-martensite becomes more stable thanα'_(bcc)-martensite with decreasing temperature,resulting in characteristic microstructures in the coarse-grained samples after impact deformation at liquid nitrogen temperature.In the coarse-grained samples under impact deformation at-80℃,ε_(hcp)-martensite transformation,α'_(bcc)-martensite transformation and deformation twinning all occur simultaneously,which greatly improves the toughness of the steel.

关键词： Toughness Grain size Twinning induced plasticity Transformations induced plasticity high-manganese steel

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Analysis of the Transformation-induced Plasticity Effect during the Dynamic Deformation of high-manganese steel

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Journal of Materials Science & Technology 2015年第2期31卷 191-198页

作者： Huizhen Wang Xiurong Sun Ping Yang Weimin Mao Li Meng School of Materials Science and Engineering University of Science and Technology Beijing

The transformation-induced plasticity(TRIP) effect and resistance characteristics to adiabatic shear failure at high strain rates of high-manganese steel were investigated by using scanning electron microscopy and electron backscattering diffraction. Results showed that the high-manganese steel exhibited excellent strain hardening effect and resistance to adiabatic shear failure because of the TRIP effect. The TRIP effect occurred during dynamic deformation and showed two distinct stages,namely,the smooth TRIP process before the formation of adiabatic shear band(ASB) and the inhibited TRIP process during further deformation. In the first stage,the martensitic transformation showed slight orientation dependence and weak variant selection,which promoted the TRIP effect. In the second stage,reverse martensitic transformation occurred. Adiabatic shear bands(ASBs) developed typical shear microtextures {111}. In microtextures,two groups of fine grains are in a twin relationship and uniform distribution,which restrained the formation of holes and cracks within the ASBs and enhanced damage resistance after ASB formation.

关键词： high-manganese steel Martensitic transformation Ad

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Effect of casting speed on dendrite arm spacing of Mn13 steel continuous casting slab

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Journal of Iron and steel Research(International) 2020年第6期27卷 665-672页

作者： Jian-min Li Mao-fa Jiang Jun-xiang Ning Jun Zhai Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Northeastern UniversityShenyang110819LiaoningChina Shanxi Taigang Stainless steel Co. Ltd.Taiyuan 030003ShanxiChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The dendrite arm spacing in the continuous casting slab of Mn13 steel under different casting speeds was measured using the metallographic microscope. Meanwhile, a heat transfer model was established by the Pro-cast software. The relationship between the dendrite arm spacing and casting speed in continuous casting slab of Mn13 steel was studied and described by a function expression. The results provide an important theoretical basis for the development and optimization of con-tinuous casting production process of high-manganese steel and help to improve the quality of continuous casting slab of high-manganese steel. Under the experimental conditions, the suitable casting speed is about 0.9 m/min. The secondary dendrite spacing maintains a relatively stable low-amplitude increase trend, and it is beneficial to obtain a higher proportion of equiaxed crystals.

关键词： high-manganese steel Dendrite arm spacing Continuous casting Casting speed

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Determination of liquidus temperatures in high-alloyed Fe-C-Mn-Si- Al steels using differential thermal analysis

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Journal of Iron and steel Research(International) 2018年第5期25卷 546-553页

作者： Chang-ling Zhuang Jian-hua Liu College of Materials and Metallurgy Guizhou UniversityGuiyang 550025 Guizhou China Engineering Research Institute University of Science andTechnology Beijing Beijing 100083 China

The liquidus temperature of the Fe-C-Mn-Si-Al alloy was investigated by using an improved differential thermal analysis method, which effectively tackles down the manganese evaporation in the course of differential thermal analysis experiments for high-manganese twinning-induced plasticity （TWIP） steels at high temperature. It was found that the liquidus temperature is more strongly dependent on the silicon content than expected. By considering the high manganese content in the Fe-C-Mn-Si-Al TWIP steels, the effect of carbon content on the depression coefficient of manganese should not be ignored, which has considerable impact on the liquidus temperature. An equation was summarized to effectively predict the liquidus temperature for a wide range of high-manganese steels. Meanwhile, the prediction results of the equation are consistent with the experimental results, as well as those results acquired from ThermoCalc.

关键词： TWIP steel Thermal analysis Liquidus temperature high-manganese steel

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Effect of deformation twinning on the evolution of texture in TWIP steels during cold-rolling

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Baosteel Technical Research 2012年第1期6卷 7-11页

作者： ZHONG Yong1,2),WANG Li 1,2),LIANG Gaofei1,2) and JIANG Yunzhe1,3) 1) Auto steel Division,Research Institute,Baoshan Iron & steel Co.,Ltd.,Shanghai 201900,China 2) State Key Laboratory of Development and Application Technology of Automotive steels (Baosteel),Shanghai 201900,China 3) School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China Auto steel Division Research InstituteBaoshan Iron &Steel Co. Ltd. Shanghai 201900 China State Key Laboratory of Development and Application Technology of Automotive steels(Baosteel) Shanghai 201900 China Auto steel Division Research InstituteBaoshan Iron &Steel Co. Ltd. Shanghai 201900 China School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Texture evolution of high-manganese twining-induced plasticity (TWIP) steels (Fe-16Mn-0.6C) during cold-rolling is studied by means of quantitative orientation distribution function (ODF)analysis.Thickness reductions of the specimens during cold-rolling are 10%,20%,30%,50% and 65%,respectively.Evolution of texture is of the Brass type,which is typical for low-stacking fault energy (SFE) materials.The contribution of deformation twinning to the development of texture is clearly illustrated by the monotonic increase of the twinned Cu component.In the present study,the deformation twinning was identified as significantly contributing to deformation up to the maximum reduction applied.These results are useful for the prediction and control of the texture in TWIP steels.

关键词： high-manganese steel deformation twin SFE texture cold-rolling

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