摘要
采用Thermo-calc热力学计算软件,对SKD61钢在400～1600℃存在的平衡相进行了热力学计算,探讨了不同合金元素含量对回火析出相析出行为的影响,在此基础上设计出热处理工艺,并对热处理试样中的析出相经电解腐蚀后进行扫描电镜(SEM)和EDS研究。计算结果表明:SKD61钢中平衡析出相主要为MC、M7C3、M6C和M23C6,试样回火后的稳定析出相为MC和M23C6,合金元素V、C对MC相和M23C6相影响最大。SKD61钢热处理后的结果显示,该模具钢较合适的淬火温度区间为(1040±20)℃,回火温度的确定应以不出现粗大的M23C6碳化物相为宜。
Equilibrium precipitated phases in SKD61 steel in the temperature range of 400 to 1600 ℃ were calculated by using thermodynamic software Thermo-cale to investigate the effect of different alloying elements content on the equilibrium precipitated phases of the tempered samples. Heat treatment process was designed based on the calculation results. Then, the heat-treated samples were electrolyticly etched and the preciptated phases were analyzed by scanning electron microscopy（SEM） and EDS. The calculation results indicate that the main equilibrium precipitated phases in SKD61steel are MC, M7C3, M6C and Mz3C6 among which MC and Mz3C6are stable precipitated phases in the tempered samples, and the most effects of alloying elements V and C on the MC and M23 C6 phases. The heat treatment results of SKD61 steel show that the appropriate quenching temperature is 1040 ± 20 ℃ , the determination of temper temperature is not appearing coarse carbide M21C6.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第5期58-64,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51174020)
