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添加微量镁以改善固溶强化型镍基高温合金的热加工性,在代N-155合金中收到良好效果。在最佳镁含量下,锻造收得率达到:78.6～88.2％,而当含镁小于0.0015％或大于0.02％时,性能明显变坏。本工作以高温拉伸试验为基础,并采用俄歇,电子探针,离子探针,金相及X光衍射等仪器对该合金的断口形貌,组织结构作了分析,对三种不同镁含量的合金的奥氏体晶界的成份及结构进行了研究。基于实验结果,探讨了镁元素对代N-155合金热加工性的影响机制。
Addition of trace amounts of magnesium to improve the hot workability of the solution strengthened nickel-based superalloy received good results on behalf of the N-155 alloy. At the best magnesium content, the forging yield reached 78.6 ~ 88.2%, while the performance was obviously deteriorated when the content of magnesium was less than 0.0015% or more than 0.02%. Based on the high temperature tensile test, the fracture morphology and microstructure of the alloy were analyzed by means of Auger, electron probe, ion probe, metallography and X-ray diffraction. The effects of three different magnesium Content of the alloy austenite grain boundary composition and structure were studied. Based on the experimental results, the effect mechanism of magnesium on the hot workability of the generation N-155 alloy was discussed.