•  
  •  
 

Abstract

At high temperature application, the failures of dissimilar metal weldments associated with the relevant degradation processes, which include chemical diffusion, oxide notching, precipitation, softening of the heat affected zone (HAZ), and creep type voids leading to cracking. This reveals that a creep in a gradient related to the microstructural degradation exists. The impression creep test was applied to monitor the effects of microstructural gradients on the localized high temperature creep properties in an autogeneous GTA aluminum weldment, and an austenitic stainless steel to ferritic steel dissimilar metal weldment respectively. To simplify the complexity of microstructural gradients, multipass weldments in A36 steel were produced. The local creep properties as a function of position were evaluated by impression creep test. A qualitative analysis of Qc and no, based on two-component composite model, was conducted at the interface region of the solidified weld metal and the reheat affected zone.

Download
COinS