Application of Numerical Simulation Considering the Effect of Phase Transformation to the Estimation of Hardness Distribution in Welds

Abstract:

This study investigated a method for estimating hardness distribution in welds, considering the effect of phase transformation and weld thermal cycles. Hardness distribution in welds was estimated from fractions and hardness of each microstructure by using rule of mixture. Finite element heat conduction analysis was performed to calculate weld thermal cycles. Microstructures formed corresponding to the thermal cycle were also calculated based on the continuous cooling transformation (CCT) diagram. The method mentioned above was applied to welds of Ultra-Narrow Gap welding process, which was developed for welding of ultrafine-grained steels. The calculated thermal cycles in the welds corresponded with measured results. Moreover, the estimated hardness distribution in the welds, which were estimated by using calculated thermal cycles and the phase fraction of each microstructure, was also in good agreement with measured values.

• Periodical: Materials Science Forum (Volume 512)
• Pages: 379-382
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.512.379
• Online since: April 2006
• Authors: Yoshiki Mikami, Masahito Mochizuki, Terumi Nakamura, Kazuo Hiraoka, Masao Toyoda
• Keywords: CCT-Diagram, Hardness, Numerical Simulation, Phase Transformation, Ultrafine Grained Steel, Ultra-Narrow Gap Welding

References

This article has no references.