含钒中锰热成形钢的高温力学性能  

High temperature mechanical properties of medium-Mn hot stamping steel containing vanadium

作　　者：魏成实 贾涓[1] 王贞[1] 葛锐 刘静[1] Wei Chengshi;Jia Juan;Wang Zhen;Ge Rui;Liu Jing(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan Hubei 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《金属热处理》2023年第8期35-41,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(51871064)。

摘　　要：采用Gleeble3500热模拟试验机对一种含钒中锰热成形钢进行了热模拟拉伸试验。观察了高温拉伸断口形貌和断口附近的显微组织,研究了拉伸温度和均热温度对中锰热成形钢高温力学性能的影响规律与机理。结果表明,经960℃与1200℃均热拉伸时,试验钢分别在830℃和850℃出现塑性低谷,此时断面收缩率分别为79.8%和58.4%。960℃均热830℃拉伸后含有较多较大的夹杂和析出颗粒,但由于原奥氏体晶粒较小,具有较好的塑性,拉伸断口为韧窝形貌。1200℃均热850℃拉伸后夹杂与析出颗粒相对较少较小,原奥氏体晶粒较大,塑性相对较差。Thermal simulation tensile testing for a kind of medium-Mn hot stamping steel containing vanadium was carried out by the Gleeble-3500 thermal simulation testing machine.The high temperature tensile fracture morphology and microstructure near the fracture were observed,and the influence rules and mechanisms of tensile temperature and soaking temperature on mechanical properties of the steel at high temperature were studied.The results show that when the steel is tensile tested after soaking at 960℃and 1200℃,the ductility trough appears at 830℃and 850℃,and the percentage reduction of area are 79.8%and 58.4%,respectively.After soaking at 960℃and then tensile testing at 830℃,more and larger inclusions and precipitates are observed,however,due to the smaller prior austenite grains,the steel has good ductility,and the tensile fracture shows ductile dimples.After soaking at 1200℃and then tensile testing at 850℃,the inclusions and precipitates are relatively fewer and smaller,the prior austenite grains are larger,and the ductility is relatively poorer.

关 键 词：含V热成形钢 拉伸温度 热塑性 原奥氏体晶粒 

分 类 号：TG352[金属学及工艺—金属压力加工]