Acta Metall Sin  1995, Vol. 31 Issue (3): 105-114    DOI:

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DISLOCATION STRUCTURE OF FATIGUE CRACK TIP

ZHENG Yesha; WANG Zhongguang; AI Suhua (State Key Laboratory of Fatigue and Fracture for Materials; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)

ZHENG Yesha; WANG Zhongguang; AI Suhua (State Key Laboratory of Fatigue and Fracture for Materials; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015). DISLOCATION STRUCTURE OF FATIGUE CRACK TIP. Acta Metall Sin, 1995, 31(3): 105-114.

Abstract References Related Articles Recommended Metrics Download:  PDF(763KB)  Export:  BibTeX | EndNote (RIS)       Abstract  It was observed first in this test that the stabilized dislocation cell and wall structures had been formed on near fatigue threshold of physcial short crack in dual-phase steels. There was a probability of forming dislocation cell on ferrite-martensite interfaces in long crack growth threshold. where the dislocation lines were more dense, there were the dislocation lines of single(R = 0,-1) and cross slip(R=-1) in the second stage of long crack growth ;there were obviously rare and lengthened dislocation lines of single and cross slip in the third stage of long crack growth. It is indicated that the dislocation morphologies of fatigue crack tip were the products of strain history. The dislocation cell and wall structures were substable on near physical short crack threshold. it was constituted into dynamic balance with cyclic stress-strain on threshold, and also was one of microstructural parameters. Key words:  fatigue threshold      crack tip      dislocation structure      dual-phase steel      physical short crack      Received:  18 March 1995      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1995/V31/I3/105 王栓柱编著.金属疲劳.福建科学与技术出版社.1986年5月2Bao-TongMa．LairdC．ActaMetall,198937(2):325sSureshS著.王中光等译.材料的疲劳.北京:国防工业出版社.19934柴惠芬,汪立勤,LairdC．金属学报,1989;25:A2015WangZG．SunZM．AiSH．MaterSciEng,1989A113:2596ZhengYS．WangZG．AiSH．,MaterSciEngng．1994A176:3937Abdel-RaoufH．PbehamP．PlumtreeA．Can,MetallQ,197110(2):878PolakJ．KlesnilJ．MaterSciEngng,1976;26:1579LawrenceFV,JonesRC．,MetallTrans,1970;1:36710EshelbyJD,FrankFD．NabarroPRN．PhilMag,1951;42:35111HutchinsonJD,MechJ．PhysSolidy,1968．161312RiceJR．ASTMSTP．1966:418:24713SuzukiH．McEvilyAJ．,MetallTrans,1979;10A:47514LucasJR．GerberichWW．FatigueFractEngMaterStruct,19836(3)271 [1] HAN Dong, ZHANG Yanjie, LI Xiaowu. 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