高淬透性高碳铬轴承钢的组织与性能  

Microstructure and properties of high hardenability high-carbon chromium bearing steel

作　　者：王秉楠 贾玉鑫 王姗姗 张亚辉 Wang Bingnan;Jia Yuxin;Wang Shanshan;Zhang Yahui(Luoyang Bearing Science and Technology Co.,Ltd.,Luoyang Henan 471000,China;Luoyang Bearing Research Institute Co.,Ltd.,Luoyang Henan 471000,China)

机构地区：[1]洛阳轴研科技有限公司,河南洛阳471000 [2]洛阳轴研所有限公司,河南洛阳471000

出　　处：《金属热处理》2024年第9期31-35,共5页Heat Treatment of Metals

基　　金：洛阳市重大科技创新专项(2201006A)。

摘　　要：对3种高淬透性高碳铬轴承钢GCr18MnMo、GCr18MnMo1和GCr19SiMnMo1进行马氏体淬火和贝氏体淬火处理,对比其显微组织、最大淬透尺寸、残留奥氏体、冲击性能差异。结果表明,淬透性从高至低排序为GCr19SiMnMo1钢>GCr18MnMo1钢>GCr18MnMo钢。若以心部硬度≥55 HRC为淬透标准,GCr18MnMo钢最大淬透尺寸约为70 mm, GCr18MnMo1钢最大淬透尺寸约为100 mm, GCr19SiMnMo1钢最大淬透尺寸约为130 mm;3种钢进行贝氏体淬火时,可保证残留奥氏体含量在1%以下;进行马氏体淬火时,GCr18MnMo钢、GCr18MnMo1钢残留奥氏体含量在15%以下,GCr19SiMnMo1钢可通过附加回火在保证高硬度的前提下,将残留奥氏体含量降低到1%以下;3种钢冲击性能接近,且贝氏体淬火后的冲击性能比马氏体淬火后高约70%。壁厚或直径超过?100 mm的零件仅可采用GCr19SiMnMo1钢以保证心部屈氏体符合要求。Martempering and austempering treatments were conducted on three types of high-hardenability high-carbon chromium bearing steels,namely GCr18MnMo steel,GCr18MnMol steel and GCr19SiMnMol steel.The differences in their microstructure,maximum hardenability size,retained austenite and impact properties were compared.The results show that the hardenability is ranked from high to low as GCr19SiMnMol steel>GCr18MnMol steel>GCr18MnMo steel.If the hardenability standard is that the core hardness is greater than or equal to 55 HRC,the maximum hardenability size of CCr18MnMo steel is approximately 70 mm,the maximum hardenability size of GCr18MnMol steel is approximately 100 mm,and the maximum hardenability size of GCr19SiMnMol steel is approximately 130 mm.When these three tested steels undergo austempering,the retained austenite content can be guaranteed to be less than 1%.During martempering,the retained austenite content of GCr18MnMo and GCr18MnMol steels is less than 15%,and for GCr19SiMnMol steel,the retained austenite content can be reduced to less than 1%by additional tempering while ensuring high hardness.The impact properties of these three specimen steels are very close,and the impact property after austempering is approximately 70%higher than that after martempering.Only GCr19SiMnMol steel can be used for parts with wall thickness or diameter more thanΦ100 mm to ensure that the core troostite meets the requirements.

关 键 词：高淬透性高碳铬轴承钢 最大淬透尺寸 冲击性能 残留奥氏体 

分 类 号：TG162.71[金属学及工艺—热处理]