ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Effect of Temper-bead Thermal Cycle on Toughness of Weld ICCGHAZ of Low Alloy Steel SQV-2A
Kenji IkeuchiJinsun LiaoHiroki TanabeFukuhisa Matsuda
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JOURNAL FREE ACCESS

1995 Volume 35 Issue 10 Pages 1203-1212

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Abstract

In order to examine HAZ properties of SQV-2A steel welded by the temper-bead technique, the effect of temper-bead thermal cycle on the toughness has been investigated for the simulated ICCGHAZ (intercritically reheated coarse-grained HAZ). The simulated ICCGHAZ specimen was produced by applying double thermal cycle consisting of first thermal cycle with a peak temperature of 1623 K and subsequent second thermal cycle with various peak temperatures Tp2 involving Ac1 and Ac3 temperatures. At Tp2 from 973 to 1003 K, serious embrittlement of the ICCGHAZ occurred which could be attributed to the formation of coarse necklace-like M-A constituent along the prior austenite grain boundary region and fine elongated M-A constituent within the prior austenite grain. When the cooling rate of the second thermal cycle was slow, serious embrittlement was also observed at Tp2 from 1073 to 1100 K, and this could be attributed to the formation of upper bainite in the reaustenitized area during the second thermal cycle. The temper-bead (third) thermal cycle with a peak temperature of 673 K could improve significantly the toughness of ICCGHAZ embrittled at Tp2 from 973 to 1003 K. However, the temper-bead thermal cycle was not effective in improving the toughness of the ICCGHAZ embrittled at Tp2 from 1073 to 1100 K in case of slow cooling rate.

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© The Iron and Steel Institute of Japan
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