摘要
采用光学显微镜、扫描电镜和力学性能测试等研究了稳定化处理对优质GH738合金组织及力学性能的影响。结果表明,稳定化温度对优质GH738合金的组织和强度影响不显著,845℃及以下时,随稳定化温度的升高,优质GH738合金的强度和持久寿命略微升高,主要原因在于二次γ′相的尺寸随稳定化温度的升高逐渐长大,一次γ′相尺寸基本不变,二者含量随稳定化温度的升高变化不明显;与稳定化温度相比,稳定化处理时间对优质GH738合金组织和性能的影响作用更加显著,随稳定化时间延长,两种γ′相的尺寸均缓慢长大,而合金强度先升高后降低。不同稳定化处理条件下优质GH738合金的力学性能变化的本质是一次及二次γ′相的尺寸、分布及其与位错的交互作用所致。
Effect of stabilizing treatment on microstructure and mechanical properties of high quality GH738 alloy was studied by means of optical microscope, scanning electron microscopy and mechanical properties test. The results show that the effect of stabilizing temperature on the microstructure and strength of the GH738 alloy is not significant, and when the temperature is equal or lower than 845 ℃, the strength and rupture life of the high-quality GH738 alloy increase slightly with the increase of stabilizing temperature. The main reason is that with the increase of stabilizing temperature, the size of secondary γ′ phase grows up gradually, but the size of primary γ′phase is basically unchanged, and the content of both of them does not change obviously. Compared with stabilizing temperature, the effect of stabilizing time on the microstructure and mechanical properties of the high quality GH738 alloy is obvious, and with the increase of stabilizing time, the sizes of the two γ′ phases grow slowly, while the strength of the alloy increases first and then decreases. The change of mechanical properties of the high quality GH738 alloy under different stabilization conditions is essentially caused by the size and distribution of primary and secondary γ′ phases and their interaction with dislocations.
作者
李钢
荣义
杨成斌
曲敬龙
杜金辉
LI Gang;RONG Yi;YANG Cheng-bin;QU Jing-long;DU Jin-hui(AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China;Gaona Aero Material Co Ltd,Beijing 100081,China;Beijing Key Laboratory of Advanced High Temperature Materials,Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2021年第7期65-71,共7页
Transactions of Materials and Heat Treatment
基金
某发动机用优质GH738合金涡轮盘锻件研制(XXXX-2016-076)。
关键词
优质GH738合金
稳定化处理
组织性能
high quality GH738 alloy
stabilizing treatment
microstructure and mechanical property
