Study on a Kind of White Massive Microstructure in P91 Steel Weld Joint

Xue Xia Xu; Yan Ting Feng; Wen Peng Li; Peng Sun; Jie Ouyang; Xiao Guang Niu

doi:10.4028/www.scientific.net/AMR.538-541.1522

Paper Titles

TEM and DSC Analysis of LT-3 Aluminum Alloy Vacuum Brazing
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An Weld Line Optimization System of Tailor Welded Blanks Based on Compensation Principle
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Numerical Simulation of Double-Sided Double Arc Welding without Back Chipping Based on MSC.MARC
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Numerical Simulation of Influences of Preheating and Postweld Heat Treatment in Welding
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Study on a Kind of White Massive Microstructure in P91 Steel Weld Joint
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Effect of Welding Method on the Hardness of Joint of 600MPa Grade New Generation Steel
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Welding Technology of SAF2507 for Offshore Platform
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The Study on 1Cr18Ni9Ti and 2Cr13 Steel Welding Joints Corrosion Resistance Properties
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Joining Refractory Metals for High-Temperature Applications
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Study on a Kind of White Massive Microstructure in P91 Steel Weld Joint

Abstract:

A kind of white massive microstructure in weld joint of P91 steel was first discussed by OM, SEM and EDS analysis. Results indicated that it is a kind of substance with low melting temperature other than the conventional delta ferrite. It contains high content of Cr due to improper choice of weld electrode and weld heat treatment. The existance of the abnormal microstructure will result in cracking under large stress for poor toughness. Solutions are suggested to prevent the formation of the white massive microstructure.