陈豪豪,操光辉

• 1:上海大学材料科学与工程学院省部共建高品质特殊钢冶金与制备国家重点实验室

摘要(Abstract)：

对铸态IN 939(Inconel 939)合金进行了两种不同工艺的热处理：固溶+时效(SA),双固溶+双时效(DSA),并研究了热处理对其显微组织及室温拉伸性能的影响。结果表明：铸态IN 939合金的显微组织由γ、γ′、MC碳化物、η相及γ/γ′共晶组成，其中γ′相有细小和粗化两种形貌。固溶+时效热处理后合金内的η相和粗大γ′相固溶进基体中重新析出细小γ′相，由于细小γ′相充分弥散而得到较为均匀的组织，MC碳化物转变为M_(23)C_6和少许粗化的γ′相；双固溶+双时效热处理使得合金中溶解了更多的析出相，使显微组织更均匀，γ′相充分长大。两种工艺热处理后合金的室温拉伸屈服强度较铸态都有一定提高，固溶+时效热处理试样提升了13.5%,双固溶+双时效试样提升了2.2%,但室温抗拉强度和塑性相比于铸态均有所降低。铸态IN 939合金的断裂机制属于韧性断裂，而SA和DSA试样均属于脆性断裂，DSA试样与SA试样相比，其室温下的塑性和拉伸性能都相对较好。

关键词(KeyWords)： IN 939合金;热处理;微观组织;拉伸性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 陈豪豪,操光辉

DOI: 10.13289/j.issn.1009-6264.2022-0172

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