Microstructures and creep fracture analysis of W strengthened high Cr steel weldment

Issue title: International Conference on Complexity and Frontiers in Strength and Fracture (ICS 2001), Sendai, Japan, 24–27 June 2001, Part II

Article type: Research Article

Authors: Tabuchi, M. | Matsui, M. | Kubo, K. | Watanabe, T. | Abe, F.

Affiliations: National Institute for Materials Science, Tsukuba, 305‐0047, Japan

Note: [] Corresponding author. E‐mail: tabuchi.masaki@nims.go.jp.

Abstract: Creep and crack growth properties of W strengthened high Cr steel weldment have been investigated at 923 K. Most of the joint specimens were type IV fractured in fine‐grained HAZ and showed shorter creep lives than base metals. The relations of creep properties and precipitation and dislocation microstructures of HAZ were investigated. The effect of welding procedure on creep life and fracture behavior was clarified by creep tests of three types of welded joints. In order to analyze the effect of vacancy diffusion on type IV creep fracture, the FEM code that simulates creep crack growth behavior taking the void formation into account has been developed.

Keywords: P122 steel, welded joint, type IV creep fracture, computational simulation

Journal: Strength, Fracture and Complexity, vol. 1, no. 2, pp. 109-116, 2003