采用热疲劳龟裂网纹模拟法，定性地研究了无钴Ｔｉ（Ｃ，Ｎ）基金属陶瓷与３Ｃｒ２Ｗ８Ｖ钢的热疲劳特性差异．结果表明，在热循环周次相同与相近的条件下，前者热疲劳裂纹呈粗大交叉的直线，起源于试样棱边的尖角处，并以较快的速度进入失稳扩展；后者形成细小典型的龟裂网纹，扩展缓慢，显示出热疲劳抗力高于前者． Thermal fatigue crack mesh simulation method was used to qualitatively study the thermal fatigue characteristics of non-cobalt (C, N) -based cermets and 3Cr2W8V steels. The results show that under the same and similar thermal cycles, the thermal fatigue cracks show a straight line of coarse intersections, originating at the sharp corners of the edge of the specimen and entering the instability propagation at a faster rate. The latter forms Small Typical cracked textured, slow expansion, showing higher thermal fatigue resistance than the former.