临界退火温度对冷轧0.11C-7.05Mn钢组织性能的影响

Effect of intercritical annealing temperature on microstructure and properties of cold rolled 0. 11C-7. 05Mn steel

利用SEM、TEM、XRD和拉伸试验机研究了0. 11C-7. 05Mn-0. 27Si中锰钢的组织和力学性能。结果表明,退火温度影响试验钢的再结晶过程与逆转奥氏体稳定性。570℃退火的组织中含有部分变形组织,再结晶不完全,630℃退火冷却的组织中逆转奥氏体部分相变为马氏体。残留奥氏体体积分数随退火温度的增加而增加,在630℃达到最大值22. 67%。600℃退火时试验钢的综合力学性能最优,抗拉强度(R_m)为901. 74 MPa,断后伸长率(A_(80))为23. 34%,强塑积(R_m×A)为21. 05 GPa·%。

The microstructure and mechanical properties of 0. 11C-7. 05Mn-0. 27Si manganese steel were investigated by SEM,TEM,XRD and tensile tester. The results show that the annealing temperature affects the recrystallization process and the stability of reverted austenite.When annealed at 570 ℃,the microstructure contains some deformed microstructure and the recrystallization process is incomplete. When the annealing temperature is 630 ℃,reverted austenite partially transforms into martensite during cooling. The volume fraction of retained austenite increases with the increase of annealing temperature and reaches 22. 67% at an annealing temperature of 630 ℃. When the intercritical annealing temperature is 600 ℃,the comprehensive mechanical properties of the tested steel are excellent,the tensile strength( Rm) reaches 901. 74 MPa,the total elongation( A80) reaches 23. 34%,and the product of strength and elongation( Rm× A) reaches21. 05 GPa·%.