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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2014.1
- 수록면
- 659 - 668 (10page)
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A Gleeble simulation was performed on low carbon steels to investigate the effect of Ni addition ontoughness and microstructure evolution in coarse grain heat affected zone from low heat input welding. Ni additionincreased the impact toughness at -20 °C and the prior austenite grain size.Microstructures of the lowNi and high Ni steel show noticeable differences in crystallography. Lath-structures in the two can be definedas crystallographic packet. In low Ni steel the packet consisting of acicular ferrite and lower bainite has allthe three Bain groups uniformly distributed; in high Ni steel the packet consisting of only lower bainitehas a dominant Bain group within it, making the other two groups subsidiary. The closely linked M/A particleswere found only in low Ni steel by tracking the orientation information. It is able to facilitate the fracturethrough the link-up of the micro-cracks initiated by each M/A particle. In the going direction of the link-upthere is no high angle boundary which can deflect the propagation of crack, thereby in this case the high angleboundary in low Ni steel is relatively ineffective. The mechanism of the toughness improvement brought by Niaddition should be ascribed to the relatively uniform transformation to final microstructure, which reducesthe appearance of closely linked M/A.
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