High temperature mechanical properties of HK40-type heat-resistant cast austenitic stainless steels

Yoon Jun Kim, Dong Geun Lee, Hyeon Kyeong Jeong, Yong Tai Lee, Ho Jang

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

This work characterized HK40-type, cast austenitic stainless steel, as the W content was varied from 0 to 3.6 wt.%. Analysis of microstructure using optical and scanning electron microscopies showed that the alloys contained relatively large amount of Cr-carbide, Nb-compound, and MnS at the austenite grain boundary. The addition of W promoted the formation of Cr-carbide and affected the high-temperature mechanical properties. According to tension tests carried out at room temperature, 400, 600, and 800 °C, the alloys became significantly stronger and brittle as W content increased. The low-cycle fatigue tests showed that fatigue resistance was also increased with Waddition, but an excessive amount of W decreased the fatigue resistance. The HK40-type alloys with 2.0 wt.% Wexhibited best high-temperature mechanical performances.

Original languageEnglish
Pages (from-to)700-704
Number of pages5
JournalJournal of Materials Engineering and Performance
Volume19
Issue number5
DOIs
Publication statusPublished - 2010 Jul

Bibliographical note

Funding Information:
This work was supported partly by the Materials & Components Technology Development program funded by the Korean Ministry of Knowledge Economy, and partly by the Korea Science and Engineering Foundation (KOSEF) through the National Research Lab. Program funded by the Ministry of Science and Technology (No. R0A-2007-000-10011-0).

Keywords

  • Heat resistant steels
  • Intermetallic phase
  • Low-cycle fatigue
  • Stainless steels
  • Tensile strength

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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