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| SUBSTRUCTURE OF WIDMANSTATTEN FERRITE AND ITS EFFECT ON CRACK PROPAGATION |
| LIU Jiheng; ZHAO Ming (Jilin University of Technology; Changchun); QIAN Derong; YAN Hucheng (Changchun Coach Plant) |
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Cite this article:
LIU Jiheng; ZHAO Ming (Jilin University of Technology; Changchun); QIAN Derong; YAN Hucheng (Changchun Coach Plant). SUBSTRUCTURE OF WIDMANSTATTEN FERRITE AND ITS EFFECT ON CRACK PROPAGATION. Acta Metall Sin, 1986, 22(5): 92-94.
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Abstract The effect of acicular ferrite in Widmanstatten structure on the mechanical properties of subeutectoid steel was studied. The results show that the substrueture of acicular ferrite consists of subgrains. The subgrain boundary is surrounded with dislocation tangles. The interior of subgrain is evenly distributed with the movable dislocations which are higher in density than that in cubic ferrite. The superior strength and better toughness are then obtained. It is revealed under direct observation that the cracks propagate to meet with obstacles of acicular ferrite and to change their direction forward even through or around it. Thus, it seems to be believed that the acieular ferrite in Widmanstatten structure is benefit to improve the mechanical properties of subeutectoid steel.
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Received: 18 May 1986
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1 何景素;刘继恒;张潮,机械工程学报,13(1965) ,№2． 23．
2 李春生;李在先,李见,冶金标准化,(1980) ,№9,47．
3 #12
4 #12
5 阎庆斌;夏建国;林保军,金属材料与热加工工艺,31(1983) ,№5,15．
6 刘继恒;赵明;吴秀贞;许德尉,金属热处理学报,6(1985) ,№1． 19．* |
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