低碳硅锰钢奥氏体区形变对贝氏体组织及力学性能影响

Effect of austenite deformation on bainite microstructure and mechanical properties of low carbon Si-Mn steel

以低碳硅锰钢为研究对象,采用Q&PB与奥氏体形变+Q&PB两种工艺,利用Gleeble-3500热模拟试验机、SEM以及拉伸试验机等对奥氏体形变对其组织及力学性能的影响进行研究。结果表明:试样经奥氏体形变之后,显微组织由粗大板条贝氏体、块状M/A岛以及马氏体演变成较细板条贝氏体以及M/A岛,块状马氏体数量减少,显微组织得到明显细化;抗拉强度由1038 MPa降到1012 MPa,伸长率由11.8%提高到13.9%,强塑积得到提高,综合力学性能得到改善。

Effect of austenite deformation on microstructure and mechanical properties of low carbon Si-Mn steel under the QPB and austenite deformation ＋ QPB process were analyzed by means of Gleeble-3500 thermal simulation testing machine,SEM and tensile test machine. The results show that the microstructure of the steel changes from coarse lath bainite,massive M/A islands and martensite into finer lath bainite and M/A islands,and is refined obviously by the decrease in the number of blocky martensite. Meanwhile,the tensile strength decreases from 1038 MPa to 1012 MPa and the elongation increases from 11. 8% to 13. 9%,which can be concluded that the strength and ductility of the steel is improved.