摘要
采用外观和金相检验等方法对牙钳表面裂纹进行了分析。结果表明,该批牙钳的坯料在非控温的油炉中加热时间过长且加热温度又过高,在坯料表面出现了严重过烧及在其内部出现了严重过热。当锻件退火后进行鳃孔扩口和柄部弧形弯曲时,过热和过烧的缺陷引起表面浅层裂纹和龟裂。
Surface crack on teethclamp was studied by means of macroscopic and metallographic examination. The results showed the teethclamp was forged in oilfurnace, heating temperature was not controlled and heating- time was too long, forging-temperature was too high, so the surface had appeared over-burnt and the inside of teethclamp was severely overheating. When gillhole was enlarged and handlearc was formed after annealed, the surface shallow crack and chap appeared.
出处
《理化检验（物理分册）》
CAS
2007年第4期208-210,共3页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
关键词
牙钳
非控温油炉加热
表面过烧
鳃部扩口
弧形弯曲操作
表面浅裂纹
龟裂
Teethclamp
Noncontrol-temperature oilfurnace heating
Surface over-burnt
Gillhole enlargeing
Handlearc forming
Surface shallow crack
Chap
