Effect of Heat Treatment Process on the Microstructure and Properties of 140 ksi Grade In718 Alloy

doi:10.20057/j.1003-8620.2024-00070

Abstract

Abstract: The effect of heat treatment process on the microstructure and properties of 140 ksi grade In718 alloy was studied. The solid solution temperature adopted three temperatures： 1 023 ℃， 1 030 ℃ and 1 050 ℃， and the aging temperature adopted three temperatures： 760 ℃， 780 ℃ and 800 ℃， the total of 9 sets of experimental data were cross tested. Then the alloy samples after different heat treatment processes were tested for room temperature tensile， -60 ℃ Charpy V-notch impact ， hardness， grain structure and other indicators， and analysis of the fracture structure and precipitates were analyzed. Research has shown that as the solid solution temperature increases， the strength of In718 alloy decreases， the plasticity and toughness increase， the grain size increases and δ phase decreases； At the same solid solution temperature， as the effective temperature increases at any time， the strength of In718 alloy decreases and the plasticity and toughness increase. The aging temperature has no effect on the grain size. γ″phase gradually coarsens from granular and spherical to needle like， and the number of γ″phases also shows a decreasing trend. Among them， the comprehensive performance of alloy is the best after solid solution treatment at 1 023 ℃ and aging treatment at 760 ℃， and the matching of indicators such as tensile strength， yield strength， plasticity， and impact toughness reaches the best level.

Key words: Heat Treatment Process, In718 Alloy, Organization, Properties, Precipitate Phase

摘要： 研究了热处理工艺对140 ksi等级In718合金组织与性能的影响。固溶温度采用1 023、1 030、1 050 ℃三个温度，时效温度采用760、780、800 ℃三个温度，交叉试验共9组试验数据。然后对经不同热处理工艺后的合金试样进行室温拉伸、-60 ℃夏比V型冲击、硬度、晶粒组织等指标进行测试，并对断口组织和析出相进行分析。研究表明，随着固溶温度升高，In718合金强度降低、塑韧性升高，晶粒尺寸增大、δ相量减小；相同固溶温度下，随时效温度升高，In718合金强度降低、塑韧性升高，时效温度对晶粒尺寸无影响，γ″相的形貌由颗粒状、球状逐渐粗化为针状，γ″相数量也呈现减小趋势。其中，在1 023 ℃固溶处理和760 ℃时效处理后合金的综合性能最佳，抗拉强度、屈服强度、塑性、冲击韧性等指标匹配达到最好水平。

关键词: 热处理工艺, In718合金, 组织, 性能, 析出相

CLC Number:

TG146.1+5

Zhang　Hong, Li Xu, Chen　Hua, Tang　Qing, Li　Linsen, Wang　Li, Gao　Shoulei. Effect of Heat Treatment Process on the Microstructure and Properties of 140 ksi Grade In718 Alloy[J]. Special Steel, 2024, 45(4): 139-145.

张宏, 李旭, 陈华, 唐琴, 李林森, 王立, 高首磊. 热处理工艺对140 ksi等级In718合金组织与性能的影响[J]. 特殊钢, 2024, 45(4): 139-145.

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