退火对汽车用0.1C-7Mn-0.3Si中锰钢组织与力学性能的影响  

Effects of Annealing on Microstructure and Mechanical Properties of 0.1C-7Mn-0.3Si Medium Manganese Steel for Automobile

作　　者：崔海军[1] 王春风[1] 桑振远 樊璐 CUI Haijun;WANG Chunfeng;SANG Zhenyuan;FAN Lu(Department of Electromechnical Engineering,Heilongjiang Oriental College,Harbin 150066,China;Harbin Tonghe Optics and Precision Machinery Co.,Ltd.,Harbin 150028,China)

机构地区：[1]黑龙江东方学院机电工程学部,黑龙江哈尔滨150066 [2]哈尔滨同和光学精密机械有限公司,黑龙江哈尔滨150028

出　　处：《热加工工艺》2020年第18期135-137,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(51075049)。

摘　　要：对汽车用0.1C-7Mn-0.3Si中锰钢进行了580~670℃、保温8 h的退火处理试验。采用扫描电镜、XRD分析、拉伸试验等方法研究了不同温度退火对0.1C-7Mn-0.3Si中锰钢组织与力学性能的影响。结果表明:随着退火温度的升高,试验钢组织中奥氏体体积分数先升高后降低,610℃退火试验钢的奥氏体体积分数最高,达到16.2vol%。当退火温度达到670℃时,试验钢组织中奥氏体已基本转化为马氏体。随着退火温度的升高,试验钢的抗拉强度逐渐升高,屈服强度、伸长率先降低后升高。经过610℃×8 h退火的试验钢强塑积最佳,达到21.6 GPa·%,其抗拉强度、屈服强度和伸长率分别为914.5 MPa、682.2 MPa和23.6%。The annealing of 0.1 C-7 Mn-0.3 Si medium manganese steel for automobile was carried out at 580-670 ℃ for 8 h. The effects of annealing at different temperatures on the microstructure and mechanical properties of the 0.1 C-7 Mn-0.3 Si medium manganese steel were studied by means of SEM, XRD, tensile test and so on. The results show that with the increase of annealing temperature, the volume fraction of austenite in the test steel increases first and then decreases. The volume fraction of austenite in the test steel annealed at 610 ℃ is the highest, reaching 16.2 vol%. When the annealing temperature reaches 670 ℃, the austenite in the test steel has basically transformed into martensite. With the increase of annealing temperature, the tensile strength of the steel increases gradually, and the yield strength and elongation first decrease and then increase. The product of strength and elongation of the steel annealed at 610 ℃ for 8 h is the best, reaching 21.6 GPa·%. Its tensile strength, yield strength and elongation are 914.5 MPa, 682.2 MPa and 23.6%, respectively.

关 键 词：中锰钢 退火 显微组织 强塑积 

分 类 号：TG161[金属学及工艺—热处理] TG156.2[金属学及工艺—金属学]