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Bulletin of Materials Science

, Volume 25, Issue 3, pp 213–217 | Cite as

XRD and TEM analysis of microstructure in the welding zone of 9Cr-1Mo-V-Nb heat-resisting steel

  • L. I. Yajiang
  • Wang Juan
  • Zhou Bing
  • Feng Tao
Article

Abstract

Under the condition of tungsten inert gas shielded welding (TIG) + shielded metal arc welding (SMAW) technology, the microstructure in the welding zone of 9Cr-1Mo-V-Nb (P91) heat-resisting steel is studied by means of X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The test results indicate that when the weld heat input (E) of TIG is 8.5 ∼ 11.7 kJ/cm and the weld heat input of SMAW is 13.3 ∼ 210 kJ/cm, the microstructure in the weld metal is composed of austenite and a little amount of δ ferrite. The substructure of austenite is crypto-crystal martensite, which included angle. There are some spot precipitates in the martensite base. TEM analysis indicates that the fine structure in the heat-affected zone is lath martensite. There are some carbides (lattice constant, 1.064 nm) at the boundary of grain as well as inside the grain, most of which are Cr23C6 and a little amount of (Fe, Me)23C6.

Keywords

Heat-resisting steel welding fine structure 

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Copyright information

© Indian Academy of Sciences 2002

Authors and Affiliations

  • L. I. Yajiang
    • 1
  • Wang Juan
    • 1
  • Zhou Bing
    • 1
  • Feng Tao
    • 1
  1. 1.Key Lab of Liquid Structure and Heredity of Materials, Ministry of Education, School of Materials Science and EngineeringShandong UniversityJinanPeople’s Republic of China

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