形变热处理变形量对Fe-25Mn-8Al-5Ni-1.2C钢组织和性能的影响
Effect of thermo-mechanical controlled processing deformation on microstructures and tensile properties of Fe-25Mn-8Al-5Ni-1.2C steel
张汉驰 1王迎春 1邱旭扬帆 1熊志平 1程兴旺1
作者信息
- 1. 北京理工大学材料学院,北京 100081
- 折叠
摘要
采用OM、SEM、TEM等试验方法研究了 1 050 ℃固溶与热轧复合的形变热处理不同变形量对450 ℃时效后Fe-25Mn-8Al-5Ni-1.2C低密度钢微观组织及力学性能的影响.结果表明,试验钢经不同变形量的形变热处理及时效后均为奥氏体单相组织.随着变形量由20％增加到60％,晶粒显著细化,平均晶粒尺寸从75μm降低至14μm;B2相的析出数量增多,尺寸增大;较大尺寸κ碳化物逐渐减少,较小尺寸κ碳化物增多,分布逐渐均匀.与未变形的时效态钢相比,形变热处理后的时效态钢屈服强度提升了 45％～72％,这源于细晶强化、位错强化以及析出强化的综合作用.同时,随着变形量的增加,钢的应变硬化能力也得到了提高.
Abstract
The effects of different deformation in thermo-mechanical controlled processing(TMCP)combined the solid solution at 1 050 ℃ with hot rolling on the microstructure and mechanical properties of Fe-25Mn-8Al-5Ni-1.2C low-density steels aged at 450 ℃ were studied by OM,SEM,TEM characterization and other experimental methods.The results show that after TMCP with different rolling reductions and aging,all the tested steels show single-phase austenite grains.With the deformation increasing from 20％to 60％,the grains are refined effectively and the average grain size decreases from 75μm to 14 μm,the precipitation and size of B2 increase;the number of the relatively large κ carbides are reduced while the smaller are increased,and its distribution gradually became homogenized.Compared with the undeformed aged steel,the yield strength of the aged steels after TMCP increases by 45％-72％d ue to the combination of grain refinement strengthening,dislocation strengthening and precipitation strengthening.Meanwhile,the strain hardening ability is improved with the deformation increasing.
关键词
形变热处理/低密度钢/析出/拉伸性能/碳化物Key words
thermo-mechanical controlled processing/lightweight steel/precipitation/tensile property/carbide引用本文复制引用
基金项目
国家科技重大专项资助项目(J2019-VI-0019-0134)
出版年
2024
NETL
NSTL
维普
万方数据