线材轧机链板失效分析

通过对链板断裂件进行金相组织、断裂形貌分析，发现链板断裂原因是链板热处理时淬火冷却速度不够，在组织中出现沿晶界分布的铁素体，导致强度下降。在机械应力作用下，使链板在短期内发生脆性断裂。

Wire Mill Chain-Slah Failure analysis

By metallographic and fractographic analysis on a fractured chain - slab workpiece, the failure reason of the workpiece is found. It is because the quench - speed of the workpiece isn' t rapid enough to avoid the formation of the intergranular ferrite, and the formation of the intergranalar ferrite leads to intensity decreased. In the end, the chain - slab workpiece fractures under stress during a short period of time.