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从工程角度定义了热作模具钢的热疲劳裂纹萌生（TFCN）寿命，应用TFCN寿命的数学模型：Ni＝K（△T一△T0）－2，对4CrZNiMoV和SCrMnMo热作模具钢热疲劳裂纹的萌生进行了分析。当热作模具的热循环温差（△T）低于热疲劳损伤的临界温差（△T0）时，热作模具的热疲劳裂纹起始寿命趋于无穷。研究表明，在最佳热处理条件下，4Cr2NiMoV钢的△T0为350℃，SCrMnMo钢的△T0为320℃，前者比后者具有较好的热疲劳抗力。
The thermal fatigue crack initiation (TFCN) life of hot work die steel was defined from engineering point of view. The thermal fatigue crack of hot work die steel of 4CrZNiMoV and SCrMnMo was simulated by using the mathematical model of TFCN life: Ni = K (△ T -ΔT0) -2 The initiation of the analysis. When the thermal cycle temperature difference (ΔT) of the hot die is lower than the critical temperature difference (ΔT0) of the thermal fatigue damage, the thermal fatigue crack initiation life of the hot die tends to infinity. The results show that △ T0 of 4Cr2NiMoV steel is 350 ℃ and △ T0 of SCrMnMo steel is 320 ℃ under the optimal heat treatment conditions. The former has better thermal fatigue resistance than the latter.