利用体视显微镜(SM)、光学显微镜(OM)和扫描电镜(SEM)对DWTT典型异常断口进行了研究,探讨了裂纹的扩展机制.结果表明,试样采用压制缺口导致撕裂面多点起裂,裂纹传播过程中发生止裂和重新起动;异常断口的形成由裂纹的止裂和重新起裂导致,同时受到锤头打击塑性变形区的影响,与产品厚度和钢级无显著相关性.
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