Scholarlink

<p>The hot compression behavior and dynamic recrystallization (DRX) process of the GH2909 superalloy were studied through an isothermal compression experimental system at temperature of 950-1100&#xa0;°C and strain rates of 0.001-1&#xa0;s<sup>−1</sup>. Based on the flow stress data, an Arrhenius-type constitutive model was developed, and the thermal activation energy was calculated to be 483.238&#xa0;kJ/mol. The dynamic material model (DMM) is utilized to create thermal processing maps that delineates the area of stable processing and the zone of rheological instability. The optimal parameters for hot processing are 1050&#xa0;°C/0.01&#xa0;s<sup>−1</sup>, at which point the power dissipation efficiency attains its peak value (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\eta \approx 0.39\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>η</mi> <mo>≈</mo> <mn>0.39</mn> </mrow> </math></EquationSource> </InlineEquation>). The GH2909 superalloy’s microstructural evolution and DRX mechanisms were studied in detail using multiple microstructural characterization techniques. At the deformation parameters of 1050&#xa0;°C/0.01&#xa0;s<sup>−1</sup>, the alloy undergoes complete DRX, resulting in a uniformly distributed equiaxed grain structure, which significantly enhance the alloy’s mechanical properties. Furthermore, the DRX process in this alloy involves both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) mechanisms, with DDRX serving as the primary nucleation mechanism and CDRX as the auxiliary nucleation mechanism.</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

Hot Compression Behavior and Dynamic Recrystallization Analysis of GH2909 Nickel-based Superalloy

  • 期刊论文

  • 发表日期：

    2025年11月25日

查看全文
  • Haiping Zhou,
  • Chuanxi Lan,
  • Bin Wang,
  • Peng Zhang,
  • Chunjiang Liu,
  • Jiyuan Wang,
  • Hongbin Zhang

摘要

The hot compression behavior and dynamic recrystallization (DRX) process of the GH2909 superalloy were studied through an isothermal compression experimental system at temperature of 950-1100 °C and strain rates of 0.001-1 s−1. Based on the flow stress data, an Arrhenius-type constitutive model was developed, and the thermal activation energy was calculated to be 483.238 kJ/mol. The dynamic material model (DMM) is utilized to create thermal processing maps that delineates the area of stable processing and the zone of rheological instability. The optimal parameters for hot processing are 1050 °C/0.01 s−1, at which point the power dissipation efficiency attains its peak value ( \(\eta \approx 0.39\) η ≈ 0.39 ). The GH2909 superalloy’s microstructural evolution and DRX mechanisms were studied in detail using multiple microstructural characterization techniques. At the deformation parameters of 1050 °C/0.01 s−1, the alloy undergoes complete DRX, resulting in a uniformly distributed equiaxed grain structure, which significantly enhance the alloy’s mechanical properties. Furthermore, the DRX process in this alloy involves both discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) mechanisms, with DDRX serving as the primary nucleation mechanism and CDRX as the auxiliary nucleation mechanism.