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Metals 2015, 5(3), 1487-1506; doi:10.3390/met5031487

A Creep Damage Model for High-Temperature Deformation and Failure of 9Cr-1Mo Steel Weldments

1
Department of Mechanical Engineering, University of Idaho, 875 Perimeter Drive, MS 0902, Moscow, ID 83844-0902, USA
2
Department of Chemical & Materials Engineering, University of Idaho, 875 Perimeter Drive, MS 3024, Moscow, ID 83844-3024, USA
3
Department of Mathematics, University of Idaho, 875 Perimeter Drive, MS 1103, Moscow, ID 83844-1103, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 23 July 2015 / Revised: 15 August 2015 / Accepted: 17 August 2015 / Published: 21 August 2015
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Abstract

A dislocation-based creep model combined with a continuum damage formulation was developed and implemented in the finite element method to simulate high temperature deformation behavior in modified 9Cr-1Mo steel welds. The evolution of dislocation structures was considered as the main driving mechanism for creep. The effect of void growth, precipitate coarsening, and solid solution depletion were considered to be the operating damage processes. A semi-implicit numerical integration scheme was developed and implemented in the commercial finite element code ABAQUS-Standard as a user material subroutine. Furthermore, several creep tests of modified 9Cr-1Mo steel welded specimens were conducted at temperatures between 550–700 °C and stresses between 80–200 MPa. The accuracy of the model was verified by comparing the finite element results with experiments. The comparison between the experimental and computational results showed excellent agreement. The model can be used to simulate and predict the creep-damage behavior of Cr-Mo steel components used as structural applications in power plants. View Full-Text
Keywords: creep; dislocation; elastic-viscoplastic material; finite element; 9Cr-1Mo Steel welds creep; dislocation; elastic-viscoplastic material; finite element; 9Cr-1Mo Steel welds
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Basirat, M.; Shrestha, T.; Barannyk, L.L.; Potirniche, G.P.; Charit, I. A Creep Damage Model for High-Temperature Deformation and Failure of 9Cr-1Mo Steel Weldments. Metals 2015, 5, 1487-1506.

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