金属学报  1996, Vol. 32 Issue (11): 1159-1164

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不锈钢微裂纹形核扩展的TEM原位观察

李红旗;陈奇志;褚武扬

北京科技大学;北京科技大学材料物理系

IN SITU TEM OBSERVATION OF NUCLEATING AND PROPAGATING OF MICROCRACKS IN STAINLESS STEEL UNDER TENSION

LI Hongqi; CHEN Qizhi; CHU Wuyang(University of Science and Technology Beijing; Beijing 100083)

李红旗;陈奇志;褚武扬. 不锈钢微裂纹形核扩展的TEM原位观察[J]. 金属学报, 1996, 32(11): 1159-1164.
, , . IN SITU TEM OBSERVATION OF NUCLEATING AND PROPAGATING OF MICROCRACKS IN STAINLESS STEEL UNDER TENSION[J]. Acta Metall Sin, 1996, 32(11): 1159-1164.

摘要 参考文献 相关文章 Metrics 全文: PDF(445 KB)   摘要: ３１０奥氏体不锈钢在透射电镜中的原位拉伸观察表明，如在裂尖发射位错后保持恒位移，则在裂尖能形成无位错区（ＤＦＺ）．这个弹性的ＤＦＺ不均匀减薄，其应力集中可等于原子键合力，从而导致纳米级微裂纹在ＤＦＺ中形核，并很快钝化成空洞．如果裂尖发射位错后继续拉伸，则上述基本过程被掩盖，仅看到交滑移使裂尖区减薄，从而导致微米级空洞或裂纹的形核和连接．如稍稍卸载，则可观察到裂尖前反塞积位错群的逆返现象． 关键词 ： ３１０不锈钢,  ＴＥＭ原位拉伸,  无位错区,  裂纹形核     Abstract：TEM in situ tensile tests of 310 stainless steel show that a dislocation free zone (DFZ) forms after equilibrium if the displacement keeps constant after many dislocations are emitted from a crack tip. The elastic DFZ is gradually thinned and the stress in DFZ will reach the cohesive strength resulting in nucleating of nanocracks in DFZ and blunting into voids. If continuously tensioning after crack tip emitted dislocations, and inhomogeneously thinning ahead of crack tip, then initiating and connecting of micro-voids(or micro-cracks) will be observed rather than DFZ, initiating of nanocracks and nanocracks' blunting into voids. The inversely piled-up dislocations ahead of a loaded crack tip can move towards the crack tip if unloading a little. Correspondent: LI Hongqi, Department of Materials Physics, University of Science and Technology Beijing,Beijing 100083 Key words： 310 stainless steel    in situ TEM tension    dislocation free zone    initiation of 收稿日期: 1996-11-18      基金资助:国家自然科学基金 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 李红旗 陈奇志 褚武扬 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1996/V32/I11/1159 1陈奇志,褚武扬,肖纪美．中国科学,1994;A24:2912张跃,褚武扬,王燕斌,肖纪美．中国科学,1994;A24:5513高克玮,陈奇志,褚武扬,肖纪美．中国科学,1994;A24:9934谷飚,张静武,乔利杰,陈奇志,褚武扬．金属学报,1994;30:A3625WilsdorfHGF．MaterSciEng,1983;59:16OhrSM．MaterSciEng,1985;72:17姚可夫,唐泳,陈南平．金属学报,1989;25:A2138姚可夫,唐泳,陈南平．金属学报,1991;27:A989张统一,黎晶,褚武扬．金属学报,1988;24(增刊):SA13410褚武杨．断裂力学基础．北京:科学出版社,1979:11211LinIH．MaterEng,1986;81:32512CherpanovGP．MechanicsofBrittleFracture．NewYork,NY:McGraw-HillInterBookComp,1979:29F [1] 沈连成; 何健英; 宿彦京; 褚武扬; 乔利杰 . Ni2MnGa铁磁形状记忆合金开裂的原位研究[J]. 金属学报, 2006, 42(8): 810-814 . [2] 许廷军; 陆永浩 . TiAl裂纹形核和塑性变形关系的研究[J]. 金属学报, 2000, 36(6): 608-612 . [3] 李远士; 牛焱 . 纯铁及310不锈钢在450℃于ZnCl2-KCl盐膜下的腐蚀[J]. 金属学报, 2000, 36(11): 1183-1186 . [4] 李陵川;朱日彰. 310不锈钢在H_2S/H_2/CO_2混合气氛中的高温腐蚀[J]. 金属学报, 1996, 32(3): 284-288. [5] 黄一中;陈奇志;褚武扬. 310奥氏体不锈钢应力腐蚀的透射电镜原位观察[J]. 金属学报, 1996, 32(1): 39-45. [6] 谷飙;张静武;乔利杰;陈奇志;褚武扬;肖纪美. 黄铜中纳米级微裂纹的形核与钝化[J]. 金属学报, 1994, 30(8): 362-367. [7] 陈奇志;褚武扬;乔利杰;王燕斌;肖纪美. 氢致脆断的TEM原位拉伸观察[J]. 金属学报, 1994, 30(6): 248-256. Viewed Full text Abstract Cited   Shared      Discussed