Effect of Cr Contents and Heat Treating on Reverted Austenite in Maraging Steel Weldments

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Abstract

By conducting flux cored arc welding (FCAW) on maraging steels with Cr contents of 1.4 and 5.2 wt%, this study observed the effects of Cr content and heat treating on reverted austenite formation in welded maraging steel. Aging treatment was carried out at the temperatures of 450, 480 and 530 °C for 3 h in each condition. As the aging temperature increased, reverted austenite was formed along the interdendritic and intercellular grain boundaries, and the proportion of reverted austenite increased with increasing Cr addition. The aging process led to the segregation of Ti and Mo along the interdendritic and intercellular grain boundaries. Some of the welded specimens were subjected to solution heat treatment at 820 and 1250 °C for 1 h after welding, resulting in a decrease in reverted austenite fraction.

Keywords

Maraging steel SEM Welding Reverted austenite 

Notes

Acknowledgement

This study was supported by Dong-A University.

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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  1. 1.R&D Center EngineerShinHung Power Actuated CylinderBusanRepublic of Korea
  2. 2.Department of Materials Science and EngineeringDong-A UniversityBusanRepublic of Korea

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