Influence of welding process on Type IV cracking behavior of P91 steel

Divya, M and Das, C R and Albert, S K and Goyal, Sunil and Ganesh, P and Kaul, R and Swaminathan, J and Murty, B S and Kukreja, L M and Bhaduri, A K (2014) Influence of welding process on Type IV cracking behavior of P91 steel. Materials Science and Engineering A, 613 (IF-2.409). pp. 148-158.

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Influence of laser welding (LW) and shielded metal arc welding (SMAW) processes on Type IV cracking behavior of modified 9Cr-1Mo (P91) steel has been investigated in this paper. The study involved comparison of stress rupture lives of modified 9Cr-1Mo steel weldments prepared by SMAW and continuous wave CO2 laser welding processes. Width of the heat affected zone (HAZ) in laser weldment was found to be 1.0 mm, whereas it was similar to 2.5 mm in SMAW weldment. The rupture lives of laser weldment were found to be higher than SMAW weldment at higher stress level and comparable at lower stress level. Under similar stress levels, the creep rupture lives of 875 degrees C heat treated specimens were found to be lower than that of the base metal and cross weld specimen. These results clearly suggest that the instability of microstructure in the intercritical heat affected zone (ICHAZ) is responsible for lower creep rupture lives of P91 steel weldment than the base metal. The experimentally observed variations in creep cavitation have been corroborated with the results of finite element (FE) analysis. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Laser welding; Shielded metal arc welding; P91 steel; Type IV cracking; Lath martensite; Finite element analysis
Divisions:Material Science and Technology
ID Code:7112
Deposited By:Sahu A K
Deposited On:07 Nov 2014 15:42
Last Modified:03 May 2016 17:29
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