摘要
使用不同工艺对机床用W18Cr4V高速钢刀具进行了热处理,研究了热处理工艺参数对钢组织和性能的影响。结果表明,试验钢球化退火组织为球状珠光体+细小粒状碳化物,淬火组织为马氏体+残余奥氏体+少量碳化物,回火组织为回火马氏体+少量粒状碳化物及残余奥氏体。随着淬火温度的提高,抗拉强度、硬度和冲击韧度均先升高后降低,1200℃时达到最大值。随着回火温度升高,硬度先降低后升高,400℃时最低,600℃最高为65 HRC。综合考虑硬度及强韧性等因素,最优淬火温度为1200℃,最优回火温度为600℃。
Heat treatment of W18Cr4V high speed steel cutter for machine tool was carried out by different processes. The influences of heat treatment process parameters on the mierostrueture and mechanical properties were investigated. The results show that, the spheroidizing annealing microstructure of tested steel is spheroidal pearlite and fine granular carbides, quenching microstructure is martensite, residual austenite and samll amount of carbides, and tempering microstructure is tempered martensite and a small amount of granular carbides and residual austenite. The tensile strength, hardness and impact toughness increase firstly and then decrease with the increase of quenching temperature, and a maximum value is at 1200 ℃. With the increase of the tempering temperature, the hardness decreases firstly and then increases, and the lowest hardness is at 400 ℃ and the highest is 65 HRC at 600 ℃. Considering the factors such as hardness and toughness, the optimum quenching temperature is 1200 ℃, and the optimum tempering temperature is 600 ℃.
出处
《热加工工艺》
CSCD
北大核心
2017年第12期215-217,221,共4页
Hot Working Technology
基金
2014年江苏省科技厅产学研项目(BY2014103)
关键词
热处理
高速钢
组织和性能
heat treatment
high speed steel
microstructure and properties
