采用光学显微镜、扫描电镜、透射电镜和高温拉伸试验机系统地研究了固溶强化Ni-Cr-W系变形高温合金组织形貌及200~900℃范围合金的拉伸变形行为.结果表明,固溶强化Ni-Cr-W系高温合金由奥氏体基体和M6C组成,组织中存在大量的堆垛层错.在650℃以下随温度的升高合金的抗拉强度和屈服强度缓慢减小,在650℃以上合金的抗拉强度迅速减小,屈服强度基本不变;在650℃以下延伸率和断面收缩率变化较小,在 650℃以上则迅速增大.形变孪晶是导致在400~700℃范围内出现锯齿状应力-应变曲线的主要因素.合金断裂方式为韧性韧窝断裂,裂纹主要在γ/M6C结合界面处产生.
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