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采用Gurson失效理论对K452镍基高温合金进行数值模拟,测定了合金的力学特性,并采用Jmatpro对该合金进行步冷曲线计算,得到它的相组成。最后采用ANSYS软件对合金的失效特性进行计算。结果显示,在步冷过程中,该合金共有7相析出,其中包括γ相、γ’、MC和M23C6等偏析相。失效特性则表现为,在相邻的空穴裂纹扩展前沿的塑性应变值最大为0.273,而远离材料空穴的区域没有发现塑性变形,说明K452高温合金内部的空穴是造成合金裂纹扩展及失效的诱发因素。
The Gurson failure theory was used to simulate the K452 nickel base superalloy. The mechanical properties of the alloy were measured and the phase composition of the alloy was obtained by Jmatpro calculation. Finally, using ANSYS software to calculate the failure characteristics of the alloy. The results show that during the cooling step, a total of seven phases are precipitated in the alloy, including the segregation phase of γ phase, γ ’, MC and M23C6. The failure characteristics are as follows: the maximum value of plastic strain at the front of the adjacent cavity crack growth is 0.273, and no plastic deformation is found in the area far away from the material hole, indicating that holes in the K452 superalloy cause crack growth and failure The predisposing factors.