采用扫描电镜拉伸装置,对55SiMnMo钢正火组织进行拉断观察,发现其断口为微坑型延性断口。微坑形核于铁素体片内,其尖细的撕裂棱是由奥氏体经受强烈的范性变形而形成的。
The fracture surface of the normalized steel 55SiMnMo was observed, under tensile testing device equipped on SEM, to be of ductile dimple feature in the bainite which are composed of austenite and ferrite. The dimple is almost nucleated in the ferrite. Because the austenitic plastic deformation is remarkable during fracturing, the tear ridge of dimple is very sharp.
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