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Date of Publication:2022-10-10

Journal:材料热处理学报

Affiliation of Author(s):材料科学与工程学院

Issue:12

Page Number:90-97

ISSN No.:1009-6264

Abstract:The Inconel 740 superalloy was prepared by electron beam melting technology, microstructure and hardness of the alloys were characterized by means of scanning electron microscopy, transmission electron microscopy, X-ray diffractometer and Vickers hardness tester, the effect of solution temperature and time on the microstructure and hardness of the 740 alloy was studied. The results show that when the solution temperature is lower than 1210, TiNiSi phase is soluted into the matrix gradually with increasing of solution temperature. When solution treated at 1210, the size of primary MC carbides in the matrix decreases with increasing of solution time. When the solution temperature is 1220, the decomposition of M23C6is caused due to long time solution treatment, G phase on the grain boundaries is transformed from the rafting γ�?phase after aging. The average size of secondary phase is less than 30 nm after solution treatment at 1210 and 1220 for 2 h and aging, its volume fraction is 40% approximately. The solution microvoids will be formed when solution treated at 1230. The Vickers hardness value show little change with increasing of solution time, the hardness of the alloy increases significantly after aging treatment, whose value is decided by the interaction between dislocations and dislocations with secondary phase. © 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.

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