Influence of Second Thermal Cycle on Reheat Cracking Susceptibility of Welding CGHAZ in Vanadium-Modified 2.25Cr1Mo Steel. (2015)

• Record Type: Journal Article
• Authors: Han, Y.C.; Chen, X.D.; Fan, Z.C.; Bu, H.Q.
• Is Part Of: Procedia engineering. Volume 130(2015)
• Page Start: 487
• Page End: 496
• Publication Date: 2015
• Subjects: reheat cracking susceptibility -- welding coarse grained heat affected zones -- second thermal cycle -- welding thermal simulation; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2015.12.245
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: The welding coarse grained heat affected zones (CGHAZ) of Vanadium-modified (V-mod) 2.25Cr1Mo steel are prone to reheat cracking because of its poor ductility in the temperature range of intermediate stress relief treatment (650∼680 ̊C). Considering the multiple-pass welding procedure of V-mod 2.25Cr1Mo steel, the microstructure, high temperature ductility and reheat cracking susceptibility of the CGHAZ subjected to second welding thermal cycle with different peak temperatures (Tp2 ) were studied by the thermal simulation technique. The results show that the high temperature ductility of double-cycle CGHAZs with all second peak temperature (730 ̊C, 890 ̊C, 1020 ̊C, 1250 ̊C) exhibits recovery in comparison to the single-cycle CGHAZ. Under the condition of Tp2 =890 ̊C and Tp2 =1020 ̊C, the recrystallization of prior austenite grains in CGHAZ results in a remarkable elevation of the high temperature ductility and a significant reduction of the reheat cracking susceptibility.