Microstructure and mechanical properties of friction stir welded high-strength steel for drilling pipe

Sangchul K. Lee, Yutaka S. Sato, Hiroyuki Kokawa, Jongsub Lee, Wonbae Lee, Minhyun Cho

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Friction stir welding (FSW) is an attractive method in welding of steels due to high energy efficiency, few solidification related defects, and reduction of distortion. In this study, microstructures and mechanical properties of FS welded P110 API-grade steel were examined. Microstructure of the stir zone (SZ) mainly consisted of the quenched martensite with low fraction of bainite, which led to very high hardness. The decrease in rotational speed could significantly reduce fraction of quenched martensite in the SZ, resulting in roughly the same hardness of the base material.

Original languageEnglish
Title of host publicationProceedings of the 21st (2011) International Offshore and Polar Engineering Conference, ISOPE-2011
Pages501-505
Number of pages5
Publication statusPublished - 2011 Sep 19
Event21st International Offshore and Polar Engineering Conference, ISOPE-2011 - Maui, HI, United States
Duration: 2011 Jun 192011 Jun 24

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Other

Other21st International Offshore and Polar Engineering Conference, ISOPE-2011
CountryUnited States
CityMaui, HI
Period11/6/1911/6/24

Keywords

  • Drilling
  • Friction stir welding
  • High strength steel
  • Mechanical properties
  • Microstructure
  • P110

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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