Influence of the Cr gradient in the transition layer on the creep rupture properties of dissimilar joints

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Abstract

The influence factor of the creep rupture properties of the materials in dissimilar material joints was studied using a transition layer and weld built with the same welding parameters as for real structures with the same base and weld materials. Creep rupture tests were conducted on welded joints at different temperatures and stresses. Most fractures appeared at the fusion zones between the transition layers. Metallographic observations, micro hardness tests, chemical composition analyses and scanning electron microscope (SEM) observations show a softened layer at the fusion zone of the transition layer which causes strain concentrations and easier fracture. The large Cr gradient between the transition layers leads to carbon migration and hardness reductions that eventually result in a softened layer. In addition, the crystallization orientation between the fusion zone and other areas in the transition layer is found to differ, which will also reduce the creep rupture strength. Thus, the creep rupture properties of dissimilar joints can be improved by optimizing the weld composition and the welding process.

Keywords creep rupture property transition layer carbon migration

Issue Date: 15 June 2014

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	Boqi ZHANG
	Zhipeng CAI
	Kejian LI
	Jiluan PAN

Cite this article:

Boqi ZHANG,Zhipeng CAI,Kejian LI, et al. Influence of the Cr gradient in the transition layer on the creep rupture properties of dissimilar joints[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(6): 828-833.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I6/828

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