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在LTES700R基础上发展了一种新型镍基耐热合金,并研究了该改进合金700℃时效后的组织与力学性能。结果表明:合金热处理后主要析出相为γ’、TiC、M_(23)C_6;在5000 h时效过程中合金组织结构稳定,Cr_(23)C_6在晶界处不连续分布,γ’粗化不明显;合金硬度随时效时间的延长先增加后缓慢降低。改进合金的室温和高温拉伸强度略低于LTES700R合金,长期时效的冲击韧性大于Nimonic263,晶界处不连续分布的碳化物增加合金晶界结合力,提高改进合金冲击韧性。
Based on LTES700R, a new type of Ni-based heat resistant alloy was developed. The microstructure and mechanical properties of the improved alloy after 700 ℃ aging were studied. The results show that the main precipitation phases are γ ’, TiC and M_ (23) C_6 after heat treatment. The alloy structure is stable during the aging of 5000 h, the discontinuous distribution of Cr_ (23) C_6 at the grain boundaries and the coarsening of γ’ Obviously, the hardness of alloy increases slowly and then decreases slowly with the increase of aging time. The tensile strength at room temperature and high temperature of the improved alloy is slightly lower than that of LTES700R alloy. The impact toughness of long-term aging is greater than that of Nimonic263. The discontinuous carbides at the grain boundaries increase the grain boundary bond strength and improve the impact toughness of the alloy.