Session: CS-14-01: Repair, Replacement and Mitigation for Fitness-for-Service Rules

Paper Number: 84884

84884 - Quantification of the Tempering Response for Temper Bead Welding of SA-508 Low Alloy Steel 

The objective of this work is to demonstrate the computational design of experiment (DoE) approach for process - microstructure – property optimization in the heat affected zone (HAZ) of SA-508 Gr. 2 Cl. 1 subjected to temper bead welding (TBW).

The tempering response in the CGHAZ and ICHAZ was quantified by a series of TBW thermal history simulations, followed by microstructural characterization and hardness measurements. Tempering response predictive equations were developed utilizing a version of the Grange Baughman parameter (GBP), modified to reflect the thermal histories in multipass welding.

In parallel, FEA models were developed to replicate the experimental weld overlays made on SA-508 Gr.2 Cl.1 by temper bead welding. Model calibration was completed by comparing the HAZ thermal histories and hardness values from both the FEA simulations and the experimental welds, and post-simulation model adjustments were made to better reflect the thermal conditions of multi-pass welding.

Also, a computational DoE simulation was developed and calibrated using the information provided by the FEA models. A TBW DoE simulation for SA-508 Gr.2 Cl.1 was ran, with the distribution of the hardness and microstructure in the HAZ serving as the model output results. By analyzing the HAZ tempering efficiency results for each set of welding parameters, the case with the highest tempering efficiency can be selected from the DoE to determine the optimal welding parameters. 

Presenting Author: Eun Jang OSU

Presenting Author Biography: Eun Jang is a Ph.D-seeking graduate student in the Welding Engineering department at The Ohio State University. He received a bachelor’s degree in Welding Engineering on May 2019.

Authors:

Eun Jang OSU
Yuxiang Luo The Ohio State University
Boian Alexandrov The Ohio State University
Steven Mccracken Electric Power Research Institute (EPRI)
Jon Tatman Electric Power Research Institute (EPRI)
Darren Barborak AZZ