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Fatigue behavior of ultrafine-grained and coarse-grained Cr-Ni austenitic stainless steels

机译:Cr-Ni奥氏体不锈钢的超细晶粒和粗晶粒的疲劳行为

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摘要

High-cycle bending fatigue behavior of an ultrafine-grained Cr-Ni Type 301LN austenitic stainless steel, obtained by reversion annealing, was investigated and compared to that of the conventional coarsegrained counterpart. The fatigue limit was significantly increased from 350 MPa to 630 MPa, reaching 59% of the tensile strength, a behavior attributed to grain refinement. Fatigue cycling resulted in hardness increments that were very different between these structures; in the coarse-grained steel 47%, but only 6-10% in the ultrafine-grained steel. The fatigue damage was observed to occur by grain boundary cracking in the ultrafine-grained steel, while mostly by slip band formation and crack propagation along these slip bands and grain boundaries in the coarse-grained counterpart. Dislocation structures observed reflected these pronounced differences in the cyclic behavior.
机译:研究了通过回归退火获得的超细晶粒Cr-Ni 301LN奥氏体不锈钢的高周弯曲疲劳行为,并将其与常规粗晶粒对应物进行了比较。疲劳极限从350 MPa显着提高到630 MPa,达到了抗拉强度的59%,这归因于晶粒细化。疲劳循环导致这些结构之间的硬度增加非常不同。在粗晶粒钢中占47%,而在超细晶粒钢中只有6-10%。观察到疲劳损伤是由超细晶粒钢中的晶界裂纹引起的,而主要是由于滑移带的形成以及沿这些滑移带和晶界在粗晶粒对应物中的裂纹扩展。观察到的位错结构反映了这些明显的周期性变化。

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  • 来源
    《Materials Science and Engineering》 |2011年第11期|p.3890-3896|共7页
  • 作者单位

    Materials Engineering Laboratory, Box 4200, University ofOulu, 90014 Oulu, Finland,Metallurgical and Materials Engineering Department, Faculty of Petroleum & Mining Engineering, Suez Canal University, Box 43721, Suez, Egypt;

    University of Oulu, Department of Mechanical Engineering, Linnanmaa, 4K0MT, Box 4200,90014 Oulu, Finland.;

    Center for Structural and Functional Materials and Chemical Engineering Department, University of Louisiana at Lafayette, Box 44130, Lafayette, LA 70504-4130, USA;

    Center for Structural and Functional Materials and Chemical Engineering Department, University of Louisiana at Lafayette, Box 44130, Lafayette, LA 70504-4130, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    austenitic stainless steel; fatigue strength; ultrafine-grained microstructure; grain boundary cracking; dislocation structure;

    机译:奥氏体不锈钢;疲劳强度;超细晶粒组织晶界裂纹;位错结构;

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