摘要
H13钢模具零件在使用过程中开裂为多块。为弄清开裂原因,通过宏观观察、扫描电镜及能谱分析、金相组织分析等方法对开裂零件进行了深入分析,结果表明:零件表面渗层呈网络状,导致脆性增加,在应力作用下,产生较多表面裂纹并逐渐扩展,最终导致零件开裂失效。为了减轻或消除零件表面网状渗层,可通过严格控制碳氮共渗工艺等途径加以解决。
A die component made of H13 steel suddenly cracked to pieces in the working process. In order to find how it fractured, the broken sample was deeply studied by macro-scopic observation, SEM, X-ray energy spectrometer and metallography microscope. The re-sult shows that nitriding layer is reticulate which makes the superficial structure crisp. Un-der the stress, more surface fractures generated and extended and finally led to the crack-ing failure. In order to reduce or eliminate network cementite, carbonnitriding process should be controlled strictly.
出处
《模具工业》
2014年第10期62-65,共4页
Die & Mould Industry
关键词
H13钢
模具零件
开裂
碳氮共渗
扩散退火
H13 steel
die components
cracking
carbonitriding
diffusion annealing
