轧制退火工艺对高碳含量孪晶诱发塑性钢拉伸变形行为的影响  

Effect of rolling and annealing process on tensile deformation behavior of high carbon content twin-induced plasticity steel

作　　者：黄玖龙 孙威杰 张岩 刘帅 冯运莉 HUANG Jiu-long;SUN Wei-jie;ZHANG Yan;LIU Shuai;FENG Yun-li(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China;Manufacturing Department,Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063210,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]首钢京唐钢铁联合有限责任公司制造部,河北唐山063210

出　　处：《塑性工程学报》2024年第5期64-70,共7页Journal of Plasticity Engineering

基　　金：河北省自然科学基金资助项目(E2021209080);河北中央引导地方资助项目(236Z1014G);唐山市科技局资助项目(23130206E);华北理工大学重点科研项目(ZD-ST-202310-23)。

摘　　要：以Fe-18Mn-1.0C高碳含量TWIP钢为研究对象,利用单向拉伸试验、光学显微镜和扫描电子显微镜研究了冷轧压下量和退火温度对高碳TWIP钢拉伸变形行为的影响。结果表明,随着压下量的增加,试验钢中产生大量变形组织,在轧制变形组织作用下,Fe-18Mn-1.0C钢的屈服强度及抗拉强度显著提高但塑性降低;冷轧高碳TWIP钢拉伸过程中产生动态应变时效(DSA)现象,随着压下量的增加,锯齿幅度减弱,锯齿数量减少,DSA现象减弱;对冷轧40%试样进行不同温度的退火处理,发现随退火温度的升高,试样屈服强度降低,当退火温度超过400℃时,抗拉强度明显下降,伸长率出现先增加后降低的现象;对于高碳TWIP钢,当退火温度超过400℃时,碳化物快速析出是其抗拉强度及伸长率降低的主要原因。Taking Fe-18Mn-1.0C high carbon content TWIP steel as the research object,the effects of cold rolling reduction and annealing temperature on tensile deformation behavior of high carbon TWIP steel were studied by uniaxial tensile tests,optical microscope(OM)and scanning electron microscope(SEM).The results show that with the increase of the rolling reduction,a large number of deformed structures are produced in the test steel.The yield strength and tensile strength increase obviously,whereas the plasticity decreases under the effect of rolling deformed structure.The dynamic strain aging(DSA)phenomenon occurs during the tensile process of the cold rolling high carbon TWIP steel.With the increase of rolling reduction,the amplitude and number of serrations decrease,and the DSA phenomenon is suppressed.The samples with cold rolling reduction of 40%were annealed at different temperatures,and it is found that with the increase of annealing temperature,the yield strength of sample decreases,the tensile strength decreases obviously when the annealing temperature is over 400℃,and the elongation increases first and then decreases.Carbide precipitation is the main reason for the decrease of tensile strength and elongation of high carbon TWIP steel when the annealing temperature exceeds 400℃.

关 键 词：孪晶诱发塑性钢 高碳含量 冷轧 退火处理 纳米孪晶 

分 类 号：TG156.2[金属学及工艺—热处理] TG335.12[金属学及工艺—金属学]