Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Intergranular Cracking Susceptibility of 2.25Cr1.3W and 9Cr1MoVNb Weld Metals at Elevated Temperatures

  • Chang, J.C. (KEPCO Research Institute) ;
  • Heo, N.H. (KEPCO Research Institute) ;
  • Lee, C.H. (Div. of Mater. Sci. and Eng., Hanyang Univ.)
  • Received : 2010.02.11
  • Accepted : 2010.09.30
  • Published : 2010.12.01
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Abstract

The difference in elevated temperature fracture behaviors of 2.25Cr1.3W (P23) and 9Cr1MoVNb (P91) steels has been investigated through simple rupture tests. P91 showed a ductile fracture behavior in the test conditions. This is due to the strong grain boundary strengthening effect of segregated molybdenum. The intergranular fracture behavior observed only in P23 is due to the strong segregation of impurities (especially, phosphorus) and the decrease in bulk content of the grain boundary strengthener, tungsten, which arises from the formation of precipitates containing tungsten.

Keywords

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