热处理工艺对20CrMoH钢齿轮锻件组织和硬度的影响  

Effect of heat treatment process on microstructure and hardness of 20CrMoH steel gear forgings

作　　者：孙江波 段路昭 任帅 孙彩凤 高志新 彭飞 Sun Jiangbo;Duan Luzhao;Ren Shuai;Sun Caifeng;Gao Zhixin;Peng Fei(Hebei HBIS Material Technology Research Institute Co.,Ltd.,Shijiazhuang Hebei 050023,China)

机构地区：[1]河北河钢材料技术研究院有限公司,河北石家庄050023

出　　处：《金属热处理》2025年第3期143-146,共4页Heat Treatment of Metals

摘　　要：为消除大锻比20CrMoH钢制齿轮锻坯心部至1/2半径处畸变最为严重部位的流线状组织,研究了不同正火工艺对畸变最为严重部位的显微组织转变和硬度变化的影响。结果表明,880~920℃区间加热时,当加热时间超过2 h时,等温温度在600℃以上保温1 h即可消除锻坯组织遗传,消除变形流线,铁素体晶粒度可达9级,同时硬度可由锻坯的249 HBW大幅度降低至146~165 HBW,且随着加热和等温时间的延长,正火效果没有明显增加。而当880~920℃区间加热时间缩短到1 h时,等温温度需要达到630℃可取得相近效果,且能节省更多的能源,降低生产成本。In order to eliminate the streamlined structure of the most severely distorted part from the core to 1/2 radius of the forged billet of 20CrMoH steel gear with a large forging ratio,the effects of different normalizing processes on the microstructure transformation and hardness change of the most severely distorted part were studied.The results show that when the heating temperature is 880-920℃and the heating time exceeds 2 h,the isothermal temperature is above 600℃and the holding time is 1 h,the microstructure heredity of the forged billet can be eliminated,and the deformation streamline can be eliminated.The ferrite grain size can reach grade 9,and the hardness can be greatly reduced from 249 HBW to 146-165 HBW.With the extension of heating and isothermal time,the normalizing effect do not increase significantly.When the heating time in the range of 880-920℃is shortened to 1 h,the isothermal temperature needs to reach 630℃to achieve the same effect,and more energy can be saved and production costs can be reduced.

关 键 词：20CRMOH钢 正火 显微组织 硬度 

分 类 号：TG156.4[金属学及工艺—热处理]