To investigate the high-temperature, high-cycle fatigue performance of Haynes 230 alloy TIG-welded joints, high-cycle fatigue tests were conducted using a fatigue testing machine. The Basquin equation was employed to characterize the relationship between stress amplitude and fatigue life, while the Manson–Garofalo (M-G) model was introduced to describe the evolution of cyclic cumulative plastic strain under varying stress amplitudes and temperatures. These two models are complementary: The Basquin equation provides a macroscopic fatigue life prediction, whereas the M-G relationship captures the progressive strain accumulation mechanism, enabling a more comprehensive understanding of fatigue damage. The derived expression for cyclic cumulative strain is:<InlineEquation ID="IEq1"> <EquationSource Format="TEX">$\left( {\varepsilon_{A}^{P} = T\left( {2.03 \times 10^{ - 6} \sigma_{a} + 0.00315} \right) - 3.7} \right)$</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close=")" open="("> <mrow> <msubsup> <mi>ε</mi> <mrow> <mi>A</mi> </mrow> <mi>P</mi> </msubsup> <mo>=</mo> <mi>T</mi> <mfenced close=")" open="("> <mrow> <mn>2.03</mn> <mo>×</mo> <msup> <mn>10</mn> <mrow> <mo>-</mo> <mn>6</mn> </mrow> </msup> <msub> <mi>σ</mi> <mi>a</mi> </msub> <mo>+</mo> <mn>0.00315</mn> </mrow> </mfenced> <mo>-</mo> <mn>3.7</mn> </mrow> </mfenced> </math></EquationSource> </InlineEquation>Microstructural and fracture surface analyses were conducted using optical microscopy and scanning electron microscopy. The results revealed characteristic fatigue striations in the crack propagation zone, with striation spacing positively correlated with stress amplitude—indicative of cyclic plastic passivation. In the final fracture region, micropore coalescence and surface oxidation led to the formation of dimpled fracture features with oxide inclusions.

Analysis of High-Temperature Fatigue Performance of Haynes 230 Alloy TIG-Welded Joints

期刊论文
发表日期：

2026年7月6日

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Xiaopeng Zhang,
Fuheng Nie,
Tieshan Cao,
Jie Zhao,
Lin Yang,
Guijun Mao,
Jikun Yang,
Yang Guo,
Yang Ran,
Dong Yang

摘要

To investigate the high-temperature, high-cycle fatigue performance of Haynes 230 alloy TIG-welded joints, high-cycle fatigue tests were conducted using a fatigue testing machine. The Basquin equation was employed to characterize the relationship between stress amplitude and fatigue life, while the Manson–Garofalo (M-G) model was introduced to describe the evolution of cyclic cumulative plastic strain under varying stress amplitudes and temperatures. These two models are complementary: The Basquin equation provides a macroscopic fatigue life prediction, whereas the M-G relationship captures the progressive strain accumulation mechanism, enabling a more comprehensive understanding of fatigue damage. The derived expression for cyclic cumulative strain is:

$\left( {\varepsilon_{A}^{P} = T\left( {2.03 \times 10^{ - 6} \sigma_{a} + 0.00315} \right) - 3.7} \right)$ $(ε_{A}^{P} = T (2.03 \times 10^{- 6} σ_{a} + 0.00315) - 3.7)$

Microstructural and fracture surface analyses were conducted using optical microscopy and scanning electron microscopy. The results revealed characteristic fatigue striations in the crack propagation zone, with striation spacing positively correlated with stress amplitude—indicative of cyclic plastic passivation. In the final fracture region, micropore coalescence and surface oxidation led to the formation of dimpled fracture features with oxide inclusions.