Paper Title:
Fatigue Performance of Laser Brazes in Advanced High Strength Steels
  Abstract

Advance high strength steels (AHSS), like dual phase (DP) and transformation induced plasticity (TRIP) steels, offer high strength and toughness combined with excellent uniform elongation. However, the higher alloying content of these steels limit their weldability and the thermal cycle of welding processes destroys the carefully designed microstructure. This will result in inferior mechanical properties of the joint. Therefore, joining processes with a low heat input, like brazing, are recommendable. Data regarding mechanical properties of joints in DP and TRIP steel is limited, especially for brazed joints. Results with respect to the fatigue lifetime of laser brazed butt joints are presented. In DP and TRIP steel, crack initiation takes place at the braze toe. In DP steel the crack propagates through the base metal. In TRIP steel, however, the crack may either follow the interface or may continue through the steel depending on the maximum stress level. The different failure mechanisms are explained on the basis of process conditions, the microstructure and the stress state.

  Info
Periodical
Materials Science Forum (Volumes 638-642)
Main Theme
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
3254-3259
DOI
10.4028/www.scientific.net/MSF.638-642.3254
Citation
M.H.E. Janssen, M.J.M. Hermans, M. Janssen, I.M. Richardson, "Fatigue Performance of Laser Brazes in Advanced High Strength Steels", Materials Science Forum, Vols. 638-642, pp. 3254-3259, 2010
Online since
January 2010
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