발간논문

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Vol.27, No.9, 767 ~ 777, 1989
Title
A Study on the Dynamic Fracture toughness of Structural Steels by Instrumented Impact Testing (5) ( On the Martensite - Austenite Constituent in Welding Bonds )
윤의박Eui Pak Yoon, 김기철Ki Chol Kim, 김주학Joo Hag Kim, 김헌주Heon Joo Kim, 조순형Soon Hyung Cho
Abstract
In multi-pass welding, the effect of 2nd pass on the microstructure and dynamic fracture toughness was discussed. The 2nd pass was found to enhance bond toughness in the range of 2.5 kJ/㎜ and 4.5 kJ/㎜ heat input. The reason seems to be that the size of Martensite -Austenite constituent was refined and its amount was decreased. The size of lower bainite and tempered martensite were also refined. TEM study revaled that the M-A constituent contained lath or twined martensite and it behaved as a crack path.
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