Scholarlink

<p>Nickel-based superalloys demonstrate exceptional mechanical strength stemming from their unique γ/γ′ microstructure. Understanding microstructural state effects on the strength of GH4742 superalloy is critical for mechanical performance. The investigation of GH4742 superalloy samples with controlled microstructure was conducted via a methodology combining tailored thermomechanical processing, heat treatment, and strengthening mechanism modeling. The γ + γ′ duplex structure achieves an optimal strength-ductility synergy, exhibiting yield strength of 805&#xa0;MPa, ultimate tensile strength of 1440 MPa, and elongation of 21%. Comparatively, samples containing fine single-modal γ′ precipitates exhibit marginally reduced performance, while mixed-grain structures containing grain boundary-localized columnar γ′ precipitates demonstrate severe property degradation (yield strength of 582&#xa0;MPa, ultimate strength of 1007&#xa0;MPa, elongation of 12%). Quantitative analysis indicates that mechanical responses are predominantly governed by multimodal γ′ precipitate distributions and their synergistic precipitation strengthening effects. Notably, the γ + γ′ duplex structure exhibits exceptional strengthening efficacy, with precipitation strengthening mechanisms contributing 670.83&#xa0;MPa to its overall strength.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of microstructure on strengthening mechanisms in GH4742 superalloy

  • 期刊论文

  • 发表日期：

    2026年2月17日

查看全文
  • Yun-Long Liu,
  • Wen-Wen Zhang,
  • Tong-Gang Lu,
  • Lan-Jun Ren,
  • Hu-Cheng Li,
  • Xin-Gang Liu,
  • Qiang Tian,
  • He-Yong Qin,
  • Kai-Yao Wang

摘要

Nickel-based superalloys demonstrate exceptional mechanical strength stemming from their unique γ/γ′ microstructure. Understanding microstructural state effects on the strength of GH4742 superalloy is critical for mechanical performance. The investigation of GH4742 superalloy samples with controlled microstructure was conducted via a methodology combining tailored thermomechanical processing, heat treatment, and strengthening mechanism modeling. The γ + γ′ duplex structure achieves an optimal strength-ductility synergy, exhibiting yield strength of 805 MPa, ultimate tensile strength of 1440 MPa, and elongation of 21%. Comparatively, samples containing fine single-modal γ′ precipitates exhibit marginally reduced performance, while mixed-grain structures containing grain boundary-localized columnar γ′ precipitates demonstrate severe property degradation (yield strength of 582 MPa, ultimate strength of 1007 MPa, elongation of 12%). Quantitative analysis indicates that mechanical responses are predominantly governed by multimodal γ′ precipitate distributions and their synergistic precipitation strengthening effects. Notably, the γ + γ′ duplex structure exhibits exceptional strengthening efficacy, with precipitation strengthening mechanisms contributing 670.83 MPa to its overall strength.