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本文借助于光学显微镜和扫描电镜，全面观察了在热应力的作用下，热疲劳裂纹在GJW50碳化钨钢结理质合金（未经锻造）表面扩展的全过程．观察结果表明，热疲劳扩展方式与硬质合金中的硬质相分布状态有关．小颗粒的硬质相聚集区与钢基体的界面是热疲劳裂纹的主要扩展地；热疲劳裂纹前沿已经开裂的大颗粒硬质相为热疲劳裂纹扩展的必经地．
In this paper, with the aid of optical microscope and scanning electron microscope, we comprehensively observed the whole process of the thermal fatigue crack expanding on the surface of GJW50 tungsten carbide steel junctional texture alloy under the action of thermal stress. The observation shows that the thermal fatigue expansion mode is related to the hard phase distribution in the cemented carbide. Small particles of hard phase aggregation area and the steel matrix interface is the main thermal fatigue crack expansion; thermal fatigue crack front has cracked large particles of hard phase thermal fatigue crack growth must pass through.