| 长期时效过程中GH4586合金的微观组织演变机理 |
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| 引用本文： | 张北江,王磊,胥国华,秦鹤勇,赵光普.长期时效过程中GH4586合金的微观组织演变机理[J].沈阳黄金学院学报,2012(2):136-140. |
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| 作者姓名： | 张北江 王磊 胥国华 秦鹤勇 赵光普 |
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| 作者单位： | [1]钢铁研究总院高温材料研究所,北京100081 [2]东北大学材料各向异性与织构教育部重点实验室,沈阳110819 |
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| 基金项目： | 973计划（2010CB631203、2011CB610506）和自然科学基金51171039项目资助. |
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| 摘 要： | 系统研究了航空涡轮盘GH4586A和GH4586B合金在700～800℃长期时效时,合金微观组织的演变过程.重点研究了时效过程中沉淀强化相与奥氏体基体的稳定性,尤其是拓扑密排相（TCP相）析出行为及其与时效温度和时效时间的关系.研究表明,长期时效过程中GH4586B合金未见TCP相析出,但γ＇相随时效时间的延长快速粗化,导致合金室温与高温强度显著衰减.GH4586A合金的γ＇相长大缓慢,从而保持了稳定的抗拉强度,但在750℃、2 000 h以上时效时出现了μ相析出在晶界与晶内M6C二次碳化物表面形核并以半共格形式向奥氏体基体内生长,致使合金的塑性有所下降.
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| 关 键 词： | 高温合金 长期时效 TCP相 微观组织 |
Mechanism of microstructure evolution of GH4586 superalloy during long- term aging process |
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| Authors: | ZHANG Bei-jiangI WANG Leiz XU Guo-hua QIN He-yongI ZHAO Guang-pu |
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| Affiliation: | l ( 1. High Temperature Materials Research Division, CISPd, Beijing 100081, China; 2. Key Laboratory for Anisotropy and Texture of Materials (MOE) , Northeastern University, Shenyang 110819, Chin |
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| Abstract: | Microstructure evolution during long - term aging from 700 ℃ to 800℃ of two experimental alloys GH4586A and GH4586B was studied. Morphological stability of austenite grain boundary and γ phase, and precipitation behavior of TCP phases were evaluated. The results show that there is no TCP phase presented during aging process, while γ phase ripen rapidly and lead to decrease of tensile strength at both room and elevated temperatures. The size and morphology of γ phase in GH4586A maintain stable, which ensures GH4586A with relatively high tensile strength after a long term exposure. The phase was observed in GH4586A when aging time was longer than 2000 hours at higher than 750 ℃, which induces a deterioration of ductile. TEM observation shows that the μ phase mainly nuclear on the MtC secondary carbides. |
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| Keywords: | SuperaUoy long - term aging TcP phase Microstructure evolution |
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