Effect of Solution Heat Treatment Temperature and Cooling Mode on Microstructure and Mechanical Property of Ni-Cr-Mo-Co Alloy

doi:10.20057/j.1003-8620.2025-00068

Abstract

Abstract: The influence laws of solution treatments at diverse temperatures and the cooling modalities subsequent to solution treatments on the microstructure and properties of the alloy were investigated. The outcomes reveal that within the temperature range of 1 100 ℃ - 1 160 ℃， with the elevation of the solution treatment temperature， carbides dissolve back into the matrix， which makes the grain grow and has a certain adverse effect on the strength and plasticity of the alloy. More thorough dissolution of carbides can further facilitate the precipitation of more continuous M₂₃C₆ - type carbides along the grain boundaries during the ensuing aging treatment， consequently reducing the mechanical properties of the alloy. Taking into account the microstructure characteristics， 1 140 ℃ can be chosen as the solution treatment temperature for this alloy.A relatively sluggish cooling approach subsequent to the alloy's solution treatment augments the precipitation propensity of M₆C type carbides and the size of these carbides. Additionally， it can prompt the precipitation of the γ′ phase， thereby enhancing the strength of the alloy. In the event that the alloy undergoes air - cooling subsequent to solution treatment， a substantial quantity of fine granular carbides will precipitate at the sites of the original carbides and their adjacent regions during the aging treatment. Abundant γ′ phases precipitate both during the slow - cooling process following solution treatment and during the aging treatment， remarkably elevating the strength of the alloy. Simultaneously， the precipitation of a large number of carbides at the grain boundaries attenuates the strength of the grain boundaries， imposing an adverse influence on the plasticity and impact energy of the alloy.

Key words: Nickel-based Alloy, Solution Heat Treatment, Cooling Rate, Microstructure, Mechanical Property

摘要： 研究了不同温度的固溶处理及固溶处理后的冷却发方式对合金组织与性能的影响规律。结果表明，在1 100~1 160 ℃温度范围内，随着固溶处理温度的升高，碳化物回溶到基体中，从而使得晶粒长大，进而对合金的强度与塑性产生一定的不利影响；碳化物更充分的回溶也可促进后续时效处理过程中晶界更加连续的M₂₃C₆型碳化物析出，从而降低合金的力学性能。结合组织情况，可选择1 140 ℃为该合金的固溶处理温度。合金固溶处理后较慢的冷却方式，增加了M₆C型碳化物的析出倾向和碳化物的尺寸，并可析出γ′相，进而提高合金的强度；若合金在固溶处理后采用空冷方式，则会在时效处理过程中于原碳化物及附近位置析出大量细小颗粒状的碳化物。固溶处理后的缓冷过程中和时效处理过程中均会析出大量的γ′相，显著提高合金的强度，同时，晶界大量碳化物的析出弱化了晶界强度，对合金的塑性和冲击功产生不利影响。

关键词: 镍基合金, 固溶处理, 冷却速率, 显微组织, 力学性能

CLC Number:

TG156.1

Bai　Yaguan, Nie　Yihong, Yang　Xiaoyu, Wang　Dapeng, Bai　Xinghong, Peng　Yamin, Fu　Wangtang. Effect of Solution Heat Treatment Temperature and Cooling Mode on Microstructure and Mechanical Property of Ni-Cr-Mo-Co Alloy[J]. Special Steel, 2025, 46(4): 150-156.

白亚冠, 聂义宏, 杨晓禹, 王大鹏, 白兴红, 彭亚敏, 傅万堂. 固溶处理温度及冷却方式对Ni-Cr-Mo-Co耐热合金组织与性能的影响[J]. 特殊钢, 2025, 46(4): 150-156.

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