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<p>The effect of the environment on the fatigue crack growth (FCG) behavior of SS316L(N) steel, under Constant <i>R</i> and Constant <i>K</i><sub>max</sub> test conditions, has been analyzed using the two-parametric approach that considers amplitude Δ<i>K</i> and the maximum stress intensity factor, <i>K</i><sub>max</sub>, are the governing load parameters controlling crack growth. The data for any selected crack growth rates plotted in terms of Δ<i>K</i> <i> vs</i> <i> K</i><sub>max</sub> fall into L-shaped curves defining the limiting values for Δ<i>K</i><sup>*</sup> and <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11661_2025_7734_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="38" /> </InlineMediaObject> <EquationSource Format="TEX">\(K_{\max }^{*}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mi>K</mi> <mrow> <mo movablelimits="true">max</mo> </mrow> <mrow> <mrow /> <mo>∗</mo> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation> for each crack growth rate, starting from the threshold growth rate. The plot of these limiting values provides the material crack growth trajectory, showing the relative contributions of each on the crack growth rate in different environments. The results indicate that the <i>K</i><sub>max</sub> contribution is dominant during crack growth in this alloy, particularly in corrosive environments. The time-dependent contributions during cyclic loads occur <i>via</i> the <i>K</i><sub>max</sub> variable. In the present case, it can be predominately due to environmental effects. The fractographic evaluation provides further confirmation.</p>

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Effect of Environment on the Fatigue Crack Growth Behavior of Nitrogen-Alloyed Stainless Steel

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月20日

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  • M. Nani Babu,
  • R. Duraipandi,
  • A. Moitra,
  • M. Vasudevan,
  • K Sadananda,
  • A. K. Vasudevan

摘要

The effect of the environment on the fatigue crack growth (FCG) behavior of SS316L(N) steel, under Constant R and Constant Kmax test conditions, has been analyzed using the two-parametric approach that considers amplitude ΔK and the maximum stress intensity factor, Kmax, are the governing load parameters controlling crack growth. The data for any selected crack growth rates plotted in terms of ΔK vs Kmax fall into L-shaped curves defining the limiting values for ΔK* and \(K_{\max }^{*}\) K max ∗ for each crack growth rate, starting from the threshold growth rate. The plot of these limiting values provides the material crack growth trajectory, showing the relative contributions of each on the crack growth rate in different environments. The results indicate that the Kmax contribution is dominant during crack growth in this alloy, particularly in corrosive environments. The time-dependent contributions during cyclic loads occur via the Kmax variable. In the present case, it can be predominately due to environmental effects. The fractographic evaluation provides further confirmation.