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<p>This study aims to enhance the predictive capability of grain growth in the nickel-based superalloy, GH4738. Systematic experiments were conducted to investigate the grain growth behavior at temperatures ranging from 1040°C to 1140°C with holding times of up to 50&#xa0;h. The results reveal that MC carbides remain stable below 1080°C, exerting a pinning effect that effectively suppresses grain growth. As a result, the grain growth curves at 1040°C and 1060°C nearly overlap. Above 1080°C, however, the carbides undergo significant dissolution, leading to a marked reduction in the pinning force and a consequent increase in the steady-state grain size. Based on these observations, improved versions of the Zener and Sellars models are proposed. By incorporating the experimentally measured steady-state grain size, the improved models circumvent the need for direct measurement of carbide volume fraction and radius, thereby simplifying the parameter set and reducing application complexity. For predicting grain growth under short-term heating conditions (10&#xa0;min), the modified Sellars model demonstrates superior extrapolation performance.</p>

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Simulation of Grain Growth Model for GH4738 Alloy with Steady-State Grain Size

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Chuan Wang,
  • He Jiang,
  • Jianxin Dong

摘要

This study aims to enhance the predictive capability of grain growth in the nickel-based superalloy, GH4738. Systematic experiments were conducted to investigate the grain growth behavior at temperatures ranging from 1040°C to 1140°C with holding times of up to 50 h. The results reveal that MC carbides remain stable below 1080°C, exerting a pinning effect that effectively suppresses grain growth. As a result, the grain growth curves at 1040°C and 1060°C nearly overlap. Above 1080°C, however, the carbides undergo significant dissolution, leading to a marked reduction in the pinning force and a consequent increase in the steady-state grain size. Based on these observations, improved versions of the Zener and Sellars models are proposed. By incorporating the experimentally measured steady-state grain size, the improved models circumvent the need for direct measurement of carbide volume fraction and radius, thereby simplifying the parameter set and reducing application complexity. For predicting grain growth under short-term heating conditions (10 min), the modified Sellars model demonstrates superior extrapolation performance.