热处理制度对K465合金组织和性能的影响

发布时间：2018-12-08 11:56

【摘要】：研究了两种热处理工艺对K465铸造高温合金组织和力学性能的影响,并与原叶片合金进行了对比分析。采用普通工艺和热等静压工艺制造K465合金,利用光学显微镜和扫描电镜观察合金的显微组织形貌,测试了拉伸性能和持久性能。结果表明,与原叶片相比,K465铸造高温合金叶片的组织特点是,晶粒度较小、枝晶组织偏大、γ'相尺寸较大。热等静压工艺可消除K465合金中的铸造疏松,普通工艺叶片的疏松分布较密集。与普通工艺相比,热等静压工艺使合金中γ'相尺寸明显减小,枝晶组织致密化,拉伸性能和持久性能有所提高。K465合金中少量的疏松、致密的枝晶组织、规则的枝晶排列、较小的γ'相尺寸可能是决定叶片良好振动疲劳性能的关键因素。
[Abstract]:The effects of two heat treatment processes on the microstructure and mechanical properties of K465 cast superalloy were studied and compared with the original blade alloy. K465 alloy was fabricated by conventional and hot isostatic pressing process. The microstructure of K465 alloy was observed by optical microscope and scanning electron microscope. The tensile and rupture properties of the alloy were tested. The results show that compared with the original blade, the microstructure of K465 cast superalloy blade is characterized by smaller grain size, larger dendritic structure and larger 纬 'phase size. Hot isostatic pressing can eliminate the loose casting in K465 alloy, and the loose distribution of the common process blade is more dense. Compared with the conventional process, the hot isostatic pressing process significantly reduced the 纬 'phase size, densified the dendrite structure, and improved the tensile and rupture properties of the alloy. A small amount of loose, dense dendritic structure and regular dendritic arrangement were observed in K465 alloy. The smaller 纬 'phase size may be the key factor to determine the good vibration fatigue performance of the blade.
【作者单位】：北京航空材料研究院中航工业失效分析中心航空材料检测与评价北京市重点实验室;中航工业成都发动机集团有限公司;中国人民解放军驻四二O厂军事代表室;
【分类号】：TG132.3;TG156

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