不同镍含量低碳贝氏体再加热焊缝金属显微组织演变的原位观察

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Gao-jun Mao , Rui Cao , Jian-hong Chen , Xi-li Guo , Yong Jiang
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引用次数: 2

摘要

利用激光扫描共聚焦显微镜观察了焊接金属在两种冷却速率下的显微组织演变。采用不同镍含量的试样进行观察。在低Ni含量(≤2 wt. %)的试样中,原位观察到由晶内成核部位转变而来的粒状贝氏体组织(即宽表面形貌),而在高Ni质量百分比(≥4 wt. %)的试样中,原位观察到源于奥氏体晶界的板条贝氏体组织。随着镍含量的增加,相变温度降低。随着Ni的加入,先前的奥氏体晶粒尺寸开始减小,随后急剧变粗。微观结构的差异主要归因于基体中不同的成核位置和生长方向。通过这些观察,不仅对化学成分、冷却速率和微观组织进行了系统的关联,而且对微观组织的演变也有了明确的认识。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In-situ observation of microstructural evolution in reheated low carbon bainite weld metals with various Ni contents

Microstructural evolution in weld metals was in-situ observed through utilizing a laser scanning confocal microscope at two cooling rates. The specimens with various nickel contents were adopted for the observation. In the specimen with low fraction of Ni (≤2 wt. %), granular bainite microstructure (i. e. broad surface relief) transformation from intragranular nucleation site was in-situ observed, while, lath bainite microstructure originating from grain boundary of austenite was in-situ observed for specimens with high mass percentage of Ni (≥ 4 wt. %). With increasing nickel content, the transformation temperature dropped. The prior austenite grain size was initially depressed and subsequently coarsened dramatically with the addition of Ni. The microstructure difference was ascribed to various nucleation sites and growth direction in the matrix. On account of those observations, not only the chemical component, cooling rate and microstructure were systematically correlated, but also the microstructural evolution was definite.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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