Effect of Cr Contents and Heat Treating on Reverted Austenite in Maraging Steel Weldments
- 227 Downloads
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.
KeywordsMaraging steel SEM Welding Reverted austenite
This study was supported by Dong-A University.
- 12.S. Hossein Nedjad, PhD Thesis. University of Tehran (2005)Google Scholar
- 13.Nam-Hoe Heo, Hu-Chul Lee, Role of chromium on mechanical properties of Fe-Mn-Ni-Mo-Ti maraging steels. Met. Mater. 1, 77–83 (1995)Google Scholar
- 17.Z. Paley, The heat treatment of 18% Ni maraging steel. Weld. Res. Suppl. 48, 245s–252s (1969)Google Scholar
- 18.ASM International, ASM Handbook 4, 528–548 (1991)Google Scholar
- 19.F. H. Lang, N. Kenyon, Welding of maraging steels. Weld. Res. Counc. Bull. 159, 3–43 (1971)Google Scholar
- 22.N. Kenyon, Effect of austenite on the toughness of maraging steel welds. Weld. J 47, 193–198 (1968)Google Scholar
- 23.T. Boniszewski, D.M. Kenyon, Examination of electron beam welds in 18% Ni/Co/Mo maraging steel sheet. Br. Weld. J. 13, 415–435 (1996)Google Scholar
- 24.J.A. Kies, H.L. Smith, H.E. Romine, Fracture toughness and critical defect sizes with welds of 18% nickel maraging steels. Metals Eng. Q. 6, 37–47 (1996)Google Scholar