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| Effect of solution and aging temperature on microstructure and properties of a
new powder superalloy |
| ZHONG Zhiyong1，2，LIU Jiantao1，2，ZHANG Yiwen1，2，LI Xiaokun1，2，JIA Jian1，2 |
| 1High Temperature Materials Research Institute，China Iron and Steel Research Institute，Beijing 100081，
China；2Beijing Key Laboratory of Advanced High Temperature Materials，Beijing 100081，China |
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Abstract The effect of solution and aging temperature on the microstructure of the new designed alloy was studied
by JMatPro、OM、FEG-SEM and EPMA . The relationship between microstructure and mechanical properties
of the alloy was analyzed. The results show that the non-dissolved large-size γ′ phases in the alloy lead to the reduction
of secondary γ′ phase after heat treatment at 1 160-1 190 ℃＋ 740-920 ℃，which meant the strengthening effect
of γ′ phase is reduced. After heat treatment at 1 190-1 220 ℃＋ 740-920 ℃，the secondary γ' phases grow up
to 240 nm and tertiary γ' phases grow up to 70 nm. Secondary γ' phases split because its center of <100> edge pitted
inward. After heat treatment at 1 190-1 220 ℃＋740-890 ℃，the volume fraction of secondary and tertiary γ′
phases is 56% ，and the morphology of secondary γ′ phases is stable and regularly arranged，which significantly increases
strengthening effects of the γ′ phase and the high temperature strength of the alloy. After that heat treatment，
the rupture life of the alloy is up to 437 h under the condition of 750 ℃/750 MPa，and the comprehensive
mechanical properties are the best.
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Received: 29 March 2019
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2021, Vol. 31 
