摘要
选用常规热处理、调质处理加亚温热处理两种工艺对35CrMo钢进行强韧化。结果表明:35CrMo钢经850℃淬火后获得马氏体组织,其硬度值较高,通过600℃回火后测其aK为117J/cm2,σs为560MPa,σb为765MPa,硬度为32HRC,ψ=75%;35CrMo钢经850℃淬火+600℃回火+790℃淬火,其显微组织为铁素体+马氏体+弥散分布的细小残余奥氏体,硬度较高,再经600℃回火后组织为回火索氏体+铁素体,其aK为123J/cm2,σs达到550MPa、σb为755MPa,ψ达到76%,硬度为30HRC。35CrMo钢经850℃淬火+600℃回火+790℃淬火+600℃回火工艺处理后,材料的强度和韧性具有良好的配合。
The microstructure and properties of 35CrMo steel after toughening treatment were studied, which selected convention heat treatment, modified treatment and then sub-temperature heat treatment process. The results show that 35CrMo steel after 850℃ convention quenching can obtain martensitic structure, and its hardness value is higher, and after 600℃ tempering, its impact toughness （aK） at room-temperature is 117 J/cm2, o＇s is 560 MPa, σb is 765 MPa, ψ is 75%; 35CrMo steel after 850℃ ＋600 ℃ modified treatment and 790 ℃ sub-temperature quenching, its microscopic structure is ferrite ＋ martensitic ＋ dispersed small retained austenite, its hardness value is higher, and after 600℃ tempering its impact toughness （ακ） at room-temperature increases significantly, which can achieve about 123 J/cm^2, σs reaches 550 MPa, σb is 755 MPa, compared with the conventional heat treatment decreases slightly, however, ψ increases slightly, reaching 76%; 35CrMo steel after quenching at 850℃ ＋ tempering at 600℃ ＋ quenching at 790℃ ＋ tempering at 600 ℃ can achieve best performance.
出处
《热加工工艺》
CSCD
北大核心
2009年第6期144-146,共3页
Hot Working Technology
关键词
35CRMO钢
调质处理
亚温淬火
强韧性
35CrMo steel
modified treatment
sub-temperature quenching
strength-toughness
