脉冲电流处理对MS1300马氏体钢组织性能的影响  

Effect of pulse current treatment on microstructure and properties of MS1300 martensite steel

作　　者：徐栋恺 陈鑫 李细锋 XU Dongkai;CHEN Xin;LI Xi-feng(Research Institute of Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China;State Key Laboratory of Development and Application Technology of Autonotive Steels(BaoSteel),Shanghai 201900,China;Institute of Forming Technology&Equipment,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]宝山钢铁股份有限公司研究院,上海201900 [2]汽车用钢开发与应用技术国家重点实验室(宝钢),上海201900 [3]上海交通大学材料科学与工程学院塑性成形技术与装备研究院,上海200030

出　　处：《塑性工程学报》2021年第4期157-162,共6页Journal of Plasticity Engineering

基　　金：NSFC-辽宁联合基金资助项目(U1908229);装备预研领域基金资助项目(61409230408)。

摘　　要：为了分析脉冲电流处理对MS1300马氏体钢微观组织和宏观力学性能的影响规律,开展了100 s持续脉冲电流处理、等温加热炉处理和短时高密度脉冲电流冲击试验。当有效电流密度不超过5.68 A·mm^(-2)时,脉冲电流处理后几乎不对材料性能和微观组织产生影响。当电流密度为9.15 A·mm^(-2),温度达到427℃时,发生回火脆性,伸长率和抗拉强度与原始试样相比分别降低33.7%和13.4%。而当电流密度为12.07 A·mm^(-2)时,MS1300钢组织中的马氏体相彻底分解并发生再结晶。采用较高电流密度时,脉冲电流处理对马氏体组织转变的作用效果比等温加热炉处理显著,引起的组织转变速度更快。控温下的短时高密度脉冲电流冲击对MS1300钢的性能基本不造成影响,脉冲电流的焦耳热效应占主导地位,非热效应在达到临界温度的前提下才能影响MS1300钢组织性能的变化。To analyze the influence of pulse current treatment on the microstructure and macro-mechanical properties of MS1300 martensite steel,continuous pulse current treatment with a duration of 100 s,isothermal furnace treatment and high-density pulse current impulse tests with short time were performed.When the effective current density does not exceed 5.68 A·mm^(-2),the pulse current treatment hardly affects the properties and microstructure of material.When the temperature reaches to 427℃at the current density of 9.15 A·mm^(-2),the temper embrittlement occurs,and the elongation and ultimate tensile strength are decreased by 33.7%and 13.4%respectively compared with that of as-received specimens.When the current density is 12.07 A·mm^(-2),the martensitic phase in the microstructure of MS1300 steel completely decomposes and the recrystallization appears.When a higher current density is applied,the effect of pulse current treatment on martensitic transformation is more prominent than that of isothermal furnace treatment,and the induced transformation rate is higher.The high-density pulse current impulse treatment with short time by controlling temperature plays a negligible role in properties of MS1300 steel.The Joule heating effect from pulse current dominates,and non-thermal effect influences the variations of microstructure and properties of MS1300 steel under the premise of reaching a critical temperature.

关 键 词：MS1300马氏体钢 脉冲电流处理 微观组织 力学性能 

分 类 号：TG301[金属学及工艺—金属压力加工]