摘要
优化了含Cr、Mo及RE-Si-Fe变质处理超高锰钢的热处理工艺,研究了超高锰钢不同温度回火处理后的组织和力学性能。结果表明,沉淀(弥散)强化使奥氏体晶内析出了弥散颗粒状M23C6型碳化物,强化了奥氏体基体。优化出超高锰钢的最佳热处理工艺为,加热至1100℃保温4 h,水淬,再经250℃保温4 h,空冷。该热处理工艺条件下奥氏体晶粒细小,晶内颗粒状碳化物均匀、弥散分布,力学性能得到显著提高,即bσ=994.51 MPa,sσ=430.98 MPa,kα=260J/cm2,HB227,δ=55.03%。与常规水韧处理相比bσ提高了18.2%,sσ提高了7%,kα提高了22%,δ提高了30.3%,硬度提高了9.7%。
The heat treatment process of super-high manganese steel with RE-Si-Fe modification which contains alloying elements Cr and Mo is optimized and the structure and mechanical properties of the steel by different tempering temperature treatment process are also studied. The experiment results show that after precipitation (dispersion) strengthening treatment, the second-phase, carbide particles M23C6 are distributing in austenitic grains, which intensify the austenitic matrix of the steel. The optimal heat treatment is treated by water toughening at 1100 ℃ and tempering at 250 ℃ for 4 hours. The microstructure of the super-high manganese steel is fine carbide particles relatively even precipitating in austenitic matrix, and its mechanical properties is enhanced dramatically: σb=994.51MPa, σs=430.98MPa, αk=260J/cm^2, HB227, δ=55.03%. Compared with that of the conventional treatment, the σb, σs, αk, δ and hardness are increased by 18.2%, 7%, 22%, 30.3%, and 9.7% respectively.
出处
《铸造》
EI
CAS
CSCD
北大核心
2006年第10期1067-1070,共4页
Foundry
基金
河南省杰出人才创新基金资助项目(项目编号:0621000600)。
关键词
热处理工艺
力学性能
超高锰钢
heat treatment process
mechanical properties
super-high manganese steel