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| Effectts of heat treatment process on microstructure and mechanical property of IN713C alloy prepared by injection molding |
| XIE Xiaohui1, WU Wei1, PAN Donghua1, YANG Zhongchen2, LU Renwei2, LI Duxin1 |
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Changsha Juzhong Metallurgy Technology Co., Ltd., Changsha 410000, China |
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Abstract IN713C alloy was prepared through metal injection molding using IN713C pre-alloyed gas atomized powder as raw powder, after solution treatment at 1 150, 1 175 and 1 120 ℃, and then aging at 760, 850 and 930 ℃. The microstructure and phase composition of the alloy were observed and analyzed by scanning electron microscopy (SEM) and energy spectrometer. The hardness and tensile strength of the alloy in temper state were determined. The results show that the γ′ precipitation phase in cooling phase decreases when the solution temperature continue to increase over a certain value. The hardness and tensile strength of the alloy reaches to 42.4 HRC and 1 175.9 MPa respectively when solid solution at 1 175 ℃. When aging at 760 ℃, the hardness and tensile strength reaches 43.6HRC and 1 223.7MPa respectively. When the aging temperature is above 760 ℃, γ′ phase size become coarser due to larger lattice mismatch; with increasing aging treatment temperature, γ′ phase the size increases, the quantity of γ′ phase and the volume fraction of the strengthening phase decrease, and the hardness and tensile strength of the alloy decrease. The optimal heat treatment process of IN713C in this study is 1 175 ℃2 h/AC+760 ℃16 h/AC.
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Received: 27 March 2017
Published: 11 July 2019
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2018, Vol. 23 
