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首页> 外文期刊>Key Engineering Materials >Influencing Factors of Stress Rupture at 750 deg.C Temperature for Cast Nickel Base Superalloy K403
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Influencing Factors of Stress Rupture at 750 deg.C Temperature for Cast Nickel Base Superalloy K403

机译：铸造镍基高温合金K403在750℃下的应力破裂影响因素

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The standard heat treatment of cast nickel-base superalloy K403 is the solid solution treatment of 1210 C/4h, air-cooling. It is very difficult to meet the requirements of the intermediate temperature stress-rupture life regulated by Aviation Standard HB5155. In order to resolve the above problem, some factors influencing intermediate stress-rupture life have been explored. The results showed that the intermediate temperature stress-rupture properties impaired by treatment of 1210 C/4h were due to precipitation of too smally y phase ( < 0.2 mu m) in grains and absence of the secondary carbides at grain boundaries. The dendritic pattern appears at the fracture surface and there is no slip trace at the gauge length part of specimens treated by 1210 C /4h, but the crystallographic plane at fracture surface and the extensive slip can be observed for the specimens treated bv 1180 deg C/4h. TEM results have shown that during intermediate temperature deformation the dislocation of l/2<1 10> moves to the interface of r /r and cuts r phase to form the high energy antiphase boundaries. The finer r can be cut and passed easily by dislocation and has a poor resistance to intermediate temperature creep. The finer dendrites and the microstructure containing intergranular M6C carbide with envelope of r. and residual coarse y . within grains were beneficial. Therefore high cooling rate during solidification and partial solid solution treatment of 1180 C /4h are suitable for a turbine blade alloy K403.
机译：铸造镍基高温合金K403的标准热处理是空冷1210 C / 4h的固溶处理。要满足航空标准HB5155规定的中间温度应力断裂寿命的要求非常困难。为了解决上述问题，已经探索了一些影响中间应力断裂寿命的因素。结果表明，处理1210 C / 4h破坏了中间温度应力断裂性能，这是由于晶粒中的y相沉淀太小（<0.2μm）和晶界处没有二次碳化物所致。在1210 C / 4h处理后的试样的标称长度部分，树枝状图案出现在断裂表面，并且没有滑移痕迹，但是在1180℃下处理的试样可以观察到断裂表面的结晶面和广泛的滑移/ 4小时。 TEM结果表明，在中间温度变形期间，l / 2 <1 10>的位错移至r / r的界面并切割r相以形成高能反相边界。较细的r容易因位错而被切割和通过，并且对中间温度蠕变的抵抗性差。较细的树枝状组织和显微组织包含具有r包络的晶间M6C碳化物。以及剩余的粗略y。谷物内有益。因此，凝固过程中的高冷却速率和1180 C / 4h的部分固溶处理适用于涡轮叶片合金K403。

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