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研究了Nimonic105镍基合金的热处理工艺对合金室、高温力学性能的影响,发现只采用固溶处理(单固溶或双固溶)可有效提升Nimonic105合金的室温冲击韧性,且固溶处理后,冷速越快对合金韧性的提升越大。本文推荐Nimonic105合金的优化热处理工艺为1150℃×4 h,水冷+1065℃×2 h,水冷。结合力学性能和相分析结果可知,Nimonic105合金的γ’相可提高室、高温屈服强度;M23C6相仅能提高Nimonic105合金的高温抗拉强度和高温塑性,对Nimonic105合金的室温抗拉强度和室、高温屈服强度的影响不大,而且晶界大量析出的M23C6相是Nimonic105合金冲击韧性下降的主要原因。只进行双固溶处理后可获得12%的γ’相和2.5%的M23C6相,使得Nimonic105合金具有较好的室、高温强度和塑性,同时保证了其冲击韧性仍处于较高的水平。
The effect of heat treatment process of Nimonic105 nickel-base alloy on the mechanical properties of the alloy chamber was studied. It was found that the room temperature impact toughness of Nimonic105 alloy can be effectively improved by solution treatment (single solution or double solution treatment). After solution treatment, The faster the cooling rate, the greater the toughness of the alloy. This article recommends Nimonic105 alloy heat treatment process optimization for the 1150 ℃ × 4h, water-cooled +1065 ℃ × 2h, water-cooled. Combining with the mechanical properties and phase analysis results, the γ ’phase of Nimonic105 alloy can improve the yield strength at room and high temperature. The M23C6 phase can only increase the high temperature tensile strength and high temperature plasticity of Nimonic105 alloy. The yield strength is not affected, and the M23C6 phase precipitated in grain boundary is the main reason for the decrease of impact toughness of Nimonic105 alloy. Only 12% γ ’phase and 2.5% M23C6 phase can be obtained only after double solution treatment, which makes Nimonic105 alloy have better room, high temperature strength and ductility, while ensuring its impact toughness is still at a high level.