外加应力对15CrMo钢贝氏体相变和显微组织的影响  

Effect of external stress on bainite transformation and microstructure of 15CrMo steel

作　　者：李振江 赵永琦 李柏年 齐会萍[1] 杨雯[1] 宋宇光 LI Zhen-jiang;ZHAO Yong-qi;LI Bai-nian;QI Hui-ping;YANG Wen;SONG Yu-guang(Shanxi Key Laboratory of Metal Forming Theory and Technology,School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Yangmei Chemical Machinery(Group)Co Ltd,Taiyuan 030032,China)

机构地区：[1]太原科技大学材料科学与工程学院金属材料成型理论与技术山西省重点实验室,山西太原030024 [2]阳煤化工机械(集团)有限公司,山西太原030032

出　　处：《材料热处理学报》2024年第11期167-175,共9页Transactions of Materials and Heat Treatment

基　　金：山西省基础研究计划资助项目(202203021211207);山西省科技创新人才团队专项资助(202204051001002);山西省重点研发计划(202202150401007)。

摘　　要：在Gleeble-3500热模拟机上对15CrMo钢进行了不同拉/压应力下的等温贝氏体相变试验。利用膨胀仪和扫描电镜研究了外加应力对15CrMo钢贝氏体相变动力学和微观组织的影响。结果表明,外加应力能为贝氏体相变提供额外的机械驱动力,促进贝氏体相变并增加贝氏体相变量,使贝氏体板条变得细长,同时细化了样品中的M/A岛组织,导致15CrMo钢的维氏硬度增加。由于施加了外应力,贝氏体相变过程中发生了择优取向现象。当外加拉应力和外加压应力大小相同时,总的相变驱动力大小相近,对贝氏体相变的影响差别不大,两种应力状态下的微观组织形貌没有明显差别。Isothermal bainite transformation tests were conducted on 15CrMo steel under different tensile and compressive stresses using a Gleeble-3500 thermal simulator.The effect of external stress on the kinetics and microstructure of bainite transformation in the 15CrMo steel was studied using an dilatometer and scanning electron microscopy.The results show that the external stress can provide additional mechanical driving force for bainite transformation,promote bainite transformation and increase the volume fraction of bainite,make the bainite laths become slender,and refine the M/A island structure in the sample,resulting in an increase in Vickers hardness of the 15CrMo steel.Due to the application of external stress,the preferred orientation phenomenon occurs during the bainite phase transition process.When the magnitude of external tensile stress and external compressive stress is the same,the total driving force for phase transformation is similar,and the effect on bainite phase transformation is not significantly different.There is no significant difference in the microstructure morphology under the two stress states.

关 键 词：15CRMO钢 贝氏体相变 外加应力 显微组织 

分 类 号：TG142.3[一般工业技术—材料科学与工程]