热处理工艺对NM600耐磨钢板组织性能的影响  

Effects of heat treatment process on microstructure and mechanical properties of NM600 wear resistant steel plate

作　　者：汪孪祥 宋仁伯[1] 温二丁 张新[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《辽宁科技大学学报》2017年第1期53-59,共7页Journal of University of Science and Technology Liaoning

摘　　要：为了提高NM600耐磨钢应用于恶劣工况下的耐磨性能,通过正交试验研究各热处理参数,包括淬火温度、淬火保温时间、回火温度、回火保温时间等,对于试验钢组织性能的影响。结果表明,回火温度是抗拉强度、屈服强度、冲击功、布氏硬度最主要的影响因素。随着回火温度升高,伸长率先小幅上升再缓慢下降,抗拉强度、屈服强度、冲击功和布氏硬度均呈下降趋势。试验钢热处理后的微观组织主要是板条马氏体、还有少量的残余奥氏体和碳化物。确定了最佳热处理工艺为:在860℃淬火保温30 min,200℃回火保温60 min。所获得的最优工艺性能为:抗拉强度1 956.2 MPa、屈服强度1 566.7 MPa、伸长率12.7%、-20℃冲击功19.2 J、布氏硬度576.5 HB。Wear resistant steel is a kind of wear resistant material used in harsh condition. In this study, the ef- fect of each heat treatment parameter including quenching temperature, quenching time, tempering tempera- ture, tempering time on microstructure and mechanical properties were investigated by orthogonal experi- ment. The results show that tempering temperature is the most significant factor to affect the tensile strength, yield strength, impact energy and hardness of the steel. With the tempering temperature increasing, the elon- gation has a slight increase before decreasing slowly, and the tensile strength, yield strength, impact energy and hardness show a downward trend. The microstructure of the test steel is mainly the martensite, and a small amount of retained austenite and carbide. The best heat treatment process is： quenching at 860 ℃ and preserve for 30 min, then tempering at 200 ℃ and preserve for 60 min. With this optimized process, the best properties were obtained： the tensile strength of 1 956.2 MPa, the yield strength of 1 566.7 MPa, the elonga- tion of 12.7%, the impact energy（-20 ℃） of 19.2 J, the hardness of 576.5HB.

关 键 词：NM600耐磨钢 正交试验 最佳热处理工艺 

分 类 号：TG143.2[一般工业技术—材料科学与工程]