Depth-sensing indentation-based studies of surface mechanical behavior and fatigue damage evolution of an austenitic stainless steel subjected to cyclic straining

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• 作者：Duyi Ye ; ^{duyi_ye@zju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Haifeng Xu ; Xianfeng Feng ; Yuandong Xu ; Lei Xiao
• 关键词：Depth-sensing indentation (DSI) ; Indentation characteristic parameters (ICPs) ; Mechanical behavior ; Crack-initiation damage ; Surface
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：5 January 2016
• 年：2016
• 卷：650
• 期：Complete
• 页码：38-51
• 全文大小：3971 K

文摘

In this paper the depth-sensing indentation (DSI) testing was used to study the elasto-plastic behavior and damage evolution in the surface layers of 304 stainless steel subjected to low-cycle fatigue loadings. For this purpose, the load–penetration depth (pan id="mmlsi0108" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0108.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=8f311366be041b5e1c2cdbc396761239" title="Click to view the MathML source">P−hpan>pan class="mathContainer hidden">pan class="mathCode">$P-h$pan>pan>pan>) curves on the surface layers of cyclically deformed specimens corresponding to various stages of fatigue process were measured, from which the indentation characteristic parameters (pan id="mmlsi0109" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0109.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=142a10222b7cedf3488a62a271299dcd" title="Click to view the MathML source">HVpan>pan class="mathContainer hidden">pan class="mathCode">$\mathrm{HV}$pan>pan>pan>, pan id="mmlsi0110" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0110.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=e6dca528441039de579295de5526d99b" title="Click to view the MathML source">Span>pan class="mathContainer hidden">pan class="mathCode">$S$pan>pan>pan>, pan id="mmlsi0111" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0111.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=b29af9c6d5c08ecbf1a5e4f53506ee44" title="Click to view the MathML source">h_rpan>pan class="mathContainer hidden">pan class="mathCode">$h_r$pan>pan>pan> and pan id="mmlsi0112" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0112.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=45e8fe85e60f6be5afe2a0b16cd49af0" title="Click to view the MathML source">W_ppan>pan class="mathContainer hidden">pan class="mathCode">$W_p$pan>pan>pan>) were extracted to evaluate the surface elasto-plastic behavior of the stainless steel during cyclic deformation. Based on the indentation characteristic parameters, the basic mechanical properties (pan id="mmlsi0113" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0113.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=e623d5e4630168710e4afcf48c3f9d5f" title="Click to view the MathML source">Epan>pan class="mathContainer hidden">pan class="mathCode">$E$pan>pan>pan>, pan id="mmlsi0114" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0114.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=f0e9f94d77c4e50b60afaec6149ae22d" title="Click to view the MathML source">σ_ypan>pan class="mathContainer hidden">pan class="mathCode">${\sigma }_y$pan>pan>pan> and pan id="mmlsi0115" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0115.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=b56fa45d052b9cca8197888f224a3ae8" title="Click to view the MathML source">npan>pan class="mathContainer hidden">pan class="mathCode">$n$pan>pan>pan>) were estimated using Dao et al.’s analysis algorithm to establish the constitutive descriptions of the fatigued surface layers. In terms of the continuum damage mechanics, a new damage indicator parameter, the indentation plastic work (pan id="mmlsi0116" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315304871&_mathId=si0116.gif&_user=111111111&_pii=S0921509315304871&_rdoc=1&_issn=09215093&md5=70b2939f81558c9d77bab388b8a5dbe6" title="Click to view the MathML source">W_ppan>pan class="mathContainer hidden">pan class="mathCode">$W_p$pan>pan>pan>), was proposed to characterize the fatigue crack-initiation damage for the stainless steel, and its evolution character during fatigue cycling was analyzed. In this study the deformation microstructures formed in near-surface regions of fatigued specimens were also examined using OM and TEM techniques to provide the micro-mechanisms for the surface mechanical behavior and fatigue damage evolution. It is finally suggested that the DSI testing could provide a potential nondestructive evaluation method for the early detection of fatigue damage of engineering components and structures in alternating service conditions.