In this paper, the failure of hot-work valve die is analysed with SEM,optical microscope and hardometer.The crack mechanism is explained and some methods are presented to prolong the die-durability.

• 本文运用电子扫描、金相分析、硬度测量等方法对气门阀热镦模的早裂进行了失效分析；探讨了模具的失效机理；提出了改善模具质量、提高模具使用寿命的途径.