Home Kovove Materialy-Metallic Materials 2017 Metallic Materials Vol. 55 (2017), no. 2, pp.115-121

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Metallic Materials Vol. 55 (2017), no. 2, pp.115-121

Title: Microstructure evolution of P92 steel weld metal after service for 8000 h
Author: J. ZHANG, B. SH. DU, X. M. LI, G. L. QIN, Y. ZOU

Abstract: Microstructure characterization and impact toughness test were performed on the P92 steel weld metal which was sectioned from the component of the main steam pipe of an ultra- supercritical unit after 8000 h exposure at high temperature. Precipitates of M23C6, MX, and Laves phase were detected in the weld metal. The weld metal after long-term service possessed much lower impact toughness compared with the as-fabricated weld metal. Micro-cracks were also found in the weld metal which formed during the welding process. Impact toughness reduction in the weld metal was correlated with the microstructure evolution.

Keywords: P92 steel, weld metal, microstructure, impact toughness, precipitates
Published online: 10-Apr-2017
Year: 2017, Volume: 55, Issue: 2 Page From: 115, Page To: 121

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