40Cr钢齿轮齿面点状剥落失效分析  

Failure analysis of the spot flaking on 40Cr steel gears surface

作　　者：谷志刚[1] 郝德中[1] 由向群[1] 

机构地区：[1]辽宁工业大学材料与化学工程学院,辽宁锦州121001

出　　处：《金属热处理》2008年第4期96-98,共3页Heat Treatment of Metals

摘　　要：通过化学成分分析、硬度检测、宏观以及微观分析等方法,对40Cr钢齿轮齿面发生点状剥落的原因进行了分析。结果表明,由于齿轮在渗氮处理前期,炉内发生了严重的短时超温,使经过调质处理的齿轮在渗氮前又发生了先期退火,造成基体组织强度和硬度过低,在强大接触负荷作用下,齿面发生了接触疲劳而造成点状剥落。The mechanism of the spot flaking on the 40Cr steel gears surface was studied by means of chemical composition, hardness, macrostructure and microstructure analyses. The results show that the furnace temperature is much high for a short time at the beginning stage of the nitriding process. The higher temperature makes the hardening and tempering gears suffer annealing, which makes the strength and hardness of the gear matrix lower. The gears surface under that nitriding process would produce the spot flaking when the gears are under the strong contact stress.

关 键 词：齿轮 渗氮 点状剥落 接触疲劳 失效分析 

分 类 号：TG157[金属学及工艺—热处理]