Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of Grain Size on the Fatigue Properties in Cold-Expanded Austenitic HNSs

  • Shin, Jong-Ho (Materials and Manufacturing Technology Development Center, Corporate Research and Development Institute, Doosan Heavy Industries and Construction Co., LTD.) ;
  • Kim, Young-Deak (Materials and Manufacturing Technology Development Center, Corporate Research and Development Institute, Doosan Heavy Industries and Construction Co., LTD.) ;
  • Lee, Jong-Wook (Materials and Manufacturing Technology Development Center, Corporate Research and Development Institute, Doosan Heavy Industries and Construction Co., LTD.)
  • Received : 2018.02.07
  • Accepted : 2018.04.15
  • Published : 2018.11.20
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Abstract

Cold-expanded austenitic high nitrogen steel (HNS) was subjected to investigate the effects of grain size on the stress-controlled high cycle fatigue (HCF) as well as the strain-controlled low cycle fatigue (LCF) properties. The austenitic HNSs with two different grain sizes (160 and $292{\mu}m$) were fabricated by the different hot forging strain. The fine-grained (FG) specimen exhibited longer LCF life and higher HCF limit than those of the coarse-grained (CG) specimen. Fatigue crack growth testing showed that crack propagation rate in the FG specimen was the same as that in the CG specimen, implying that crack propagation rate did not affect the discrepancy of LCF life and HCF limit between two cold-expanded HNSs. Therefore, it was estimated that superior LCF and HCF properties in the FG specimen resulted from the retardation of the fatigue crack initiation as compared with the CG specimen. Transmission electron microscopy showed that the effective grain size including twin boundaries are much finer in the FG specimen than that in the CG specimen, which can give favorable contributions to strengthening.

Keywords

Acknowledgement

Supported by : Ministry of Trade, Industry and energy (MOTIE)

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