金属学报  1982, Vol. 18 Issue (1): 58-128

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珠光体组织的形变、裂纹形核与扩展微观过程的动态研究

徐永波;刘民治

中国科学院金属研究所;中国科学院金属研究所

AN IN S ITU STUDY OF CRACK NUCLEATION AND PROPAGATION IN PEARLITE DURING DEFORMATION

Xu Yongbo; Liu Minzhi (Institute of Metal Research; Academia Sinica; Shenyang)

徐永波;刘民治. 珠光体组织的形变、裂纹形核与扩展微观过程的动态研究[J]. 金属学报, 1982, 18(1): 58-128.
, . AN IN S ITU STUDY OF CRACK NUCLEATION AND PROPAGATION IN PEARLITE DURING DEFORMATION[J]. Acta Metall Sin, 1982, 18(1): 58-128.

摘要 参考文献 相关文章 Metrics 全文: PDF(4240 KB)   摘要: 用扫描电镜对含碳量为0.15,0.47和0.79wt-％的三种碳素钢进行了拉伸试验,观察了珠光体组织形变与断裂的动态过程。结果表明,15和45号钢形变主要在铁素体中进行,珠光体可发生剪切形变与旋转等现象。裂纹主要在夹杂物界面、珠光体与铁素体两相界面上产生,最后的断裂遵循延性断裂机制;对于完全是片层珠光体组织的T8钢,渗碳体片层表现出一定程度的塑性变形能力,并随片层间距的减小变形能力增强。对于细片层组织,应变分布比较均匀,变形范围比较广泛,渗碳体片层可产生滑移和弯曲,断裂方式表现出延性断裂特征;在粗珠光体中,应变分布很不均匀,变形主要集中在强烈剪切变形带中进行,裂纹形核主要是渗碳体片层沿剪切形变带开裂的结果,断裂方式表现出脆性断裂特征。 用位错塞积模型讨论了珠光体组织的脆性开裂现象。 Abstract：The microprocess of deformation and fracture of structural steels containing 0.15, 0.45 and 0.79％ C respectively have been examined by tensile testing on SEM. For the specimens of steels 15 and 45, it was observed that the deformation is mainly undergone in proeutectoid ferrite, as well as shear, multipe-slip and colony rotation exhibited in pearlite. The crack is almost entirely nucleated at the interface of the inclusion/matrix or pearlite/ferrite. The fracture mode is ductile. In specimens of eutectoid steel T8, the cementite lamellae may be plastically deformed to some extent, and its tendency increases with the decrease of interlamellar spacing. When the microstructure contains fine pearlite, a uniform strain distribution, a wider strain range as well as slip and bending phenomena of cementite lamellae have been observed. Fracture is of ductile characteristic. On the contrary, coarse pearlite deformed more inhomogeneously with localized strain in intense shear bands. The crack nucleation is initiated by cracking of cementite lamellae along shear bands. The fracture is brittle. The cracking phenomenon along shear deformation bands in eementite lamellae has been discussed by the authors referring to the model of pile-up of dislocations. 收稿日期: 1982-01-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 徐永波 刘民治 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1982/V18/I1/58 1 Miller, L. E.; Smith, G. C., J. Iron Steel Inst., 208 (1970) , 998． 2 Burns, K. W.; Picketing, F. B., J. Iron Steel Inst., 202 (1964) , 899． 3 Gurland, J., Acta Metall., 20 (1972) , 735． 4 Lindborg, U., ASM Trans, Q., 61 (1968) , 500． 5 Rosenfleld, A. R.; Hahn, G. T.; Embury, J. D., Metall. Trans., 3 (1972) , 2797． 6 徐永波;刘民治;朱桂秋;于章,金属学报,16(1980) ,486． 7 Danko, J. C.; Stout, R. D., Weld., J., 34 (1955) , 113-s. 8 Porter, D. A.; Easterling, K. E.; Smith, G. D. W., Acta Metall. 26 (1978) , 1405． 9 徐永波;刘民治;李恒武;苏会和;朱桂秋,金属学报,15(1979) ,367． 10;徐永波;刘民治;于章;朱桂秋,金属学报,17(1981) ,102． 11 徐永波;穆在勤;刘民治;杨淑华,科学通报(待发表). 12 Lai, Z. H.; Wie, H. Y.; Liu, S. F.; Li R. C., Proc. Fourth Int. Conf. on Titumium, Vol. 3, 1980, Eds. Kimura, H.; Izumi, O., Metall. Soc. AIME, New York, p. 1757． 13 Koss, R. A.; Chan, K. S., Acta Metall., 28 (1980) , 1245． 14 徐永波;徐振声;张天宜;刘民治;庄育智;待发表. 15 Smith, E.; Barnby, J. T., Met. Sci. J., 1 (1967) , 56．I No related articles found! Viewed Full text Abstract Cited   Shared      Discussed