摘要
结合Thermo-Calc热力学计算,通过高温激光共聚焦显微镜观察,研究凝固过程中马氏体不锈钢5Cr15MoV组织及碳化物的演变行为。研究发现,在0.1℃s的最低冷却速度下仍有马氏体发生转变,通过差热分析得到的奥氏体临界相变温度Ac1和Ac3分别为592.50℃和745.60℃。在冷却凝固过程中,马氏体不锈钢5Cr15MoV组织及碳化物的演变行为表现为:1468.00℃下发生匀晶转变;1386.00℃下发生包晶反应;1120.00℃下析出M7C3;1045.00℃下M7C3转变为M23C6;800.00℃下M23C6停止析出。Thermo-Calc热力学计算和实际凝固分析结果显示,马氏体不锈钢5Cr15MoV的最终凝固组织为铁素体、马氏体、残余奥氏体、M7C3和M23C6。
In this paper,the microstructure and carbide evolution of 5Cr15MoV martensitic steel during solidification are observed by Thermo-Calc thermodynamic calculation and high temperature laser confocal microscopy.The results show that martensite transformation still exists at the slowest cooling rate of 0.1℃/s.The critical transformation points of austenite transformation are A c 1592.50℃ and A c 3745.60℃ by differential thermal analysis.During cooling solidification,homogeneous transformation occurs at 1468.00℃,peritectic reaction occurs at 1386.00℃,M7C3 precipitates at 1120.00℃,M 7C 3 transforms to M23C6 at 1045.00℃,and M23C6 ceases to precipitate at 800.00℃.Combined with Thermo-Calc thermodynamic calculation and actual solidification analysis,the final solidification structure of 5Cr15MoV is ferrite,martensite,retained austenite,M7C3 and M23C6.
作者
闫寒
何志军
吕楠
刘吉辉
徐太旭
YAN Han;HE Zhijun;LU Nan;LIU Jihui;XU Taixu(School of Materials and Metallurgy,University of Science and Technology,Anshan Liaoning 114016,China)
出处
《重庆科技学院学报（自然科学版）》
CAS
2019年第6期7-13,共7页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
国家自然科学基金项目“非平衡态下多组分熔渣反应过程中的界面化学冶金行为”(51874171),“高强度合金钢中多元复合非金属夹杂的生成机理及塑性控制研究”(51504132)
辽宁科技大学-海洋装备用金属材料及其应用国家重点实验室联合基金项目“海工用高锰钢复杂温变条件下铸坯相变特性及组织控制技术研究”(SKLMEA-USTLN(201904))
关键词
马氏体不锈钢
凝固过程
组织
碳化物
martensitic stainless steel
solidification
organization
carbide
