通过在690℃高温回火后对15SiMn2Mo低碳贝氏体钢进行10%拉伸变形或不同变形量压缩变形,再进行不同温度回火,研究了冷变形(拉伸和压缩)和变形后不同温度回火对试验材料的组织和性能的影响。结果显示,随着回火温度增加,试验材料的抗拉强度增加,300℃回火强度达到最大值,与热轧低温回火强度相当。超过300℃回火材料的强度下降,伸长率和断面收缩率增加。随着压缩变形量的提高,材料的硬度值升高,加工硬化效果显著,组织中出现铁素体形变带。压缩变形后随着回火温度的提高,材料组织发生回复与再结晶,形成细小等轴晶粒,组织细化,压缩变形量增加,细化效果增加。

The effect of cold deformation (elongation and compression) and after deformation at different temperature temper on microstructure and mechanical properties of 15SiMn2Mo low carbon beinaitic steel were studied. The results show that after 10% pre-tensile deformation and different temperature temper,increase the temper temperature,tensile strength increased and reached the best value after 300℃ temper and equaled the hot rolling and low temperature temper in strength. The temperature in excess of 300℃,the tensile strength decreases and percentage elongation and area reduction increase. The compressibility coefficient increases and brings about work hardening and hardness increases and forms ferrite deformation bands in microstructure. After compressibility deformation and different temperature temper,the microstructure takes place recovery and recrystallization and forms refined equiaxed crystal grain,microstructure refinement and the compressibility deformation amount increases,refined effect increases.