摘要
以低碳硅锰钢为研究对象,采用两相区退火(I&Q)和两相区退火+奥氏体化+贝氏体等温处理(I&Q&PB)工艺,对两相区退火过程中的Mn配分行为以及I&Q&PB工艺中两相区保温时间对钢的组织和性能的影响进行研究。结果表明,两相区保温过程中Mn元素由铁素体向奥氏体扩散。I&Q&PB工艺中,当两相区保温时间为5~10 min时,显微组织主要是粒状贝氏体;当达到20~60 min时,随着保温时间延长,显微组织主要为弥散分布的马奥岛以及晶界边缘逐渐出现的块状马奥岛组成的粒状组织,抗拉强度未发生明显变化;受到残余奥氏体稳定性的影响,伸长率呈现先升高后降低的趋势。
The Mn partitioning in the intercritical annealing（IQ） process and the effect of Mn partitioning time in IQPB process on microstructure and mechanical properties of a low carbon Si-Mn steel were analyzed. The results show that the Mn element diffuses from the ferrite to the austenite in the IQ process. During the IQPB process, when the holding time of intercritical is 5~10 min, the microstructure is mainly granular bainite; when reaching 20-60 min, with the prolongation of holding time, it is mainly granular structure; dispersive arrangement of M/A and grain boundaries gradually appear in the massive M/A leading to its tensile strength is not change significantly. In addition, the elongation tends to increase first and then decrease as a result of the retained austenite stability.
出处
《铸造技术》
北大核心
2017年第12期2809-2812,共4页
Foundry Technology
基金
国家级大学生创新创业训练计划(201510081023)
河北省自然科学基金项目(E2016209048)
河北省高等学校科学技术研究项目(QN2016185)资助
