采用拉伸、冲击、硬度等力学性能的测试以及金相组织观察、XRD、SEM分析了27SiMn钢在淬火温度为770~830℃、等温温度为360~420℃和等温时间为10~90min时，显微组织和力学性能的变化规律。结果表明，通过790℃加热保温50min，380℃等温20min，空冷到室温后可以得到铁素体+贝氏体+残余奥氏体的三相组织，得到最好的综合性能，Rm×A5为27225MPa×%，其中抗拉强度Rm为825MPa，伸长率A5为33%，其冲击韧性和硬度分别为47J/cm2和HB219。此时残余奥氏体含量为15.76%，贝氏体孕育期最短，TRIP效应最明显。
The micro-structure and mechanical properties of 27SiMn steel was investigated by tensile test, hardness test, impact toughness, metallographic structure, XRD and SEM for quenching in 770-830℃, isothermal holding temperature in 360-420℃and isothermal holding time in 10-90min. The results show that 27SiMn can obtain of the ferrite, bainite and retained austenite of three-phase organization after heating at 790℃, holding 50min and isothermal holding at 380℃ for 20min. Mechanical properties are 27225MPa×% of the best overall performance, 825MPa of the tensile strength, 33% of the elongation, 47J/cm2 and HB219 of the impact toughness and hardness. This residual austenite content is 15.76% and the bainite incubation period is the shortest, which contributes to TRIP effect.
参考文献
| [1] | |
| [2] | 江利.[J].张太超,崔永丽.现代金属材料及应用[M].徐州:中国矿业大学出版社,2009,:- |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%