Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

An Evaluation of Fatigue Properties on Dissimilar Friction Weld of Heat-Resisting Steels Used in Vehicle Valves

차량 밸브용 내열강재 이종 마찰용접부의 피로특성 평가

  • 이동길 (조선대학교 대학원 기계공학과) ;
  • 이상열 (목포과학대학 자동차과) ;
  • 정재강 (조서대학교 기계공학부)
  • Published : 2002.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

The fatigue crack propagation characteristics were investigated on dissimilar friction weld of two kind of heat-resisting steels (STR3 and STR35) commonly used in valve materials for vehicles. A small circular artificial defect was machined to induce fatigue crack at bonded line, heat affected zone and base metal of the weld on the surface of the specimens. From the results of the experiment, the fatigue limits of the materials STR3 and STR35 were obtained to be 429.0MPa and 409.4MPa respectably. The STR35 base metal and 1.0mm HAZ specimens showed 190% and 82% higher fatigue life than STR3 base metal. And the fatigue life of 1.0mm HAZ specimen was shown 99% on STR3 and 29% on STR35 higher than that of their base metal. But the fatigue life of weld interface specimen was shown 18% on STR3 and 72% on STR35 lower than that of their base metal because of the weld interface separation.

Keywords

References

  1. 정호신, T.Shinoda, '마찰용접의 이론과실제의 적용,' 대한용접학회지, 제15권 제6호, pp1-12, 1997
  2. D.E.Spindler, 'Whatlndustry Needs to know about Friction Welding, 'Welding journal, pp.37-42, 1994
  3. 조현수, 서성재, 'Inconel 713C와 SCM440의 마찰용접,' 대한용접학회지, 제15권 제6호, pp.564-565, 1997
  4. 채왕석, 권용기, 김동현, '마르텐사이트계 내열강의 금속및 기계적특성에 관한연구,' 한국정밀공학회 춘계학술대회논문집, p.1073, 1997
  5. 한봉희, 금속재료, 희중당, pp.268-300, 1993
  6. 西谷, 鹿毛, '電解硏磨した廣穴材の回轉曲げ, '日本機械學會論文, 第39卷 第323號, pp. 2005-2012, 1966
  7. 西谷弘信, 森光武則, "小穴付 き試驗片の回轉軸げ試驗によるき裂傳ば特性の評價,' 日本機械學會文集, 第42卷 第354號, p.328, 1976
  8. 이상용, '비관통 원공 결함재에 있어서 짧은 균열의 비선형 거동 및 크랙성장에 관한 연구, 고려대학교 석사학위논문, pp.22-48, 1992
  9. 이동길, 이상열, 정재강, '미소원공결함을 갖는자동차 전륜구동축재의 온도변화에 따른피로크랙전파거동에관한연구,' 한국자동차공학회논문집, 제6권 제6호, pp.185-194, 1998