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研究了焊接ＣＧＨＡＺ（ＣｏａｒｓｅＧｒａｉｎＨｅａｔ－ＡｆｆｅｃｔｅｄＺｏｎｅ）的相变超塑性变形及其对疲劳寿命的作用，结果发现：（１）采用相同焊接热循环与不同的拘束位移，所模拟的焊接ＣＧＨＡＺ中存在着相变超塑性现象。（２）该超塑性应变为１％时，其疲劳寿命要比无相变超塑性的提高１９％，（３）在无相变超塑性ＣＧＨＡＺ中，（Ｍ－Ａ）组元的形态基本上呈长条状；当相变超塑性应变增至１．０％时，（Ｍ－Ａ）组元变化成长条状与块状的混合型形态。
The phase transition superplastic deformation of CGHAZ and its effect on fatigue life were studied. The results show that: (1) The same welding thermal cycle and different restraining displacement are used to simulate the phase transition in CGHAZ. Superplastic phenomenon. (2) When the superplastic strain is 1%, the fatigue life is 19% higher than that of the non-phase-change superplasticity. (3) The morphology of (M-A) When the superplastic strain increased to 1.0%, the (M-A) element changed into a mixed morphology of elongated strip and block.