金属学报  1981, Vol. 17 Issue (3): 266-369

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中碳铬镍钼钒钢大型锻件层状断口的观察

张菊水

大冶钢厂钢铁研究所

LAMELLAR FRACTURE CHARACTERISTICS OF MEDIUM-CARBON CrNiMoV STEEL FORGINGS

by Zhang Jushui (Research Institute of Daye Steel Works)

张菊水. 中碳铬镍钼钒钢大型锻件层状断口的观察[J]. 金属学报, 1981, 17(3): 266-369.
. LAMELLAR FRACTURE CHARACTERISTICS OF MEDIUM-CARBON CrNiMoV STEEL FORGINGS[J]. Acta Metall Sin, 1981, 17(3): 266-369.

摘要 参考文献 相关文章 Metrics 全文: PDF(3981 KB)   摘要: 采用透射电子显微镜详细观察了中碳铬镍钼钒钢大型锻件层状断口上呈条带状无光泽棱面的微观特征,对断面上萃取的各种第二相进行选区电子衍射和电子探针分析。发现这种棱面上有微细圆球α-MnS、薄膜或树枝状VC沉淀,还分布着沿热加工方向排列,以SiO_2为主体的片状Si、Mn复合氧化物,以及第Ⅰ类MnS夹杂。 层状断口认为是由于钢的初始奥氏体晶界上的元素严重偏析,导致各种第二相晶间沉淀,从而引起晶界脆化。提出这种断口本质上类似“石状-冰糖”断口。层状断口能够显著降低钢的横向拉伸塑性,并稍许减低其冲击韧性。 Abstract：The lamellar fracture with streaky matt facets found in cracked surface of medium-carbon CrNiMov steel forgings has been observed by TEM. Various extracted second phases in carbon replicas from the fracture surface were identified by selected-area electron diffraction technique and EPMA. The results indicate that the fine globular α-MnS, the type-Ⅰ MnS inclusion and the thin platelet or dentritic VC were appeared, as well as the flaky complex oxides of Si and Mn, mainly as SiO_2,distributed along the direction of hot forging. The lamellar fracture characteristics relating to intercrystalline cracking is due to various second phase precipitates at its primary austenite grain boundaries. It seems that the lamellar fracture is similar to the "rocky-rock candy" one in cast steel substantially, thus,it may decrease remarkaly the transverse tensile ductility and lower moderately the impact toughness of the steel. 收稿日期: 1981-03-18      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 张菊水 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1981/V17/I3/266 [1] 层次结构断口三结合研究组,金属学报,12(1976) ,92． [2] 齐齐哈尔钢厂试验室低倍断口小组,金属学报,14(1978) ,223． [3] Barnard, L. and Brook, R., J. Iron Steel Inst., 205 (1967) , 756． [4] Baker, T. J. and Harrison, W. D., Met. Technol., 2 (1975) , 201． [5] Baker, T. J. and Johnson, R., J. Iron Steel Inst., 211 (1973) , 783． [6] 张菊水,陈家光,金属学报,16(1980) ,159． [7] 张菊水(叶里),金属学报,13(1977) ,187． [8] Glue, D. R., Jones, C. H. and Lloyd, H. K. M., Met. Technol., 2 (1975) , 416．1 No related articles found! Viewed Full text Abstract Cited   Shared      Discussed