Acta Metall Sin  1994, Vol. 30 Issue (6): 239-247    DOI:

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BEHAVIOUR OF MICROSTRUCTURE OF Ni9 STEEL UNDER DEFORMING-FRACTURING

ZHANG Futian;LOU Zhifei(State Key Laboratory for Fatigue and Failure-of Materials; Institute of Metal Research;Chinese Academy of Sciences;Shenyang);YE Yugong;LI Duanyi(Institute of Mechanics;Chinese Academy of Sciences;Beijing)(Manuscript received 28 December;1993)

ZHANG Futian;LOU Zhifei(State Key Laboratory for Fatigue and Failure-of Materials; Institute of Metal Research;Chinese Academy of Sciences;Shenyang);YE Yugong;LI Duanyi(Institute of Mechanics;Chinese Academy of Sciences;Beijing)(Manuscript received 28 December;1993). BEHAVIOUR OF MICROSTRUCTURE OF Ni9 STEEL UNDER DEFORMING-FRACTURING. Acta Metall Sin, 1994, 30(6): 239-247.

Abstract References Related Articles Recommended Metrics Download:  PDF(857KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The behaviour of α+γ region treated microstructure of Ni9 steel during-196℃ cryogenic impact and tensile deformation has been studied by using both a quasi-dynamic method in which the low temperature(-196℃) impact cracks stopped in the specimen and the tensile deformation halted,and a dynamic method to observe the surface structure under deformation to fracture.The results show that if more(about 10 v.-%) thermally stable γ'-phase occurred in specimens,the excellent cryogenic toughness is resulted in γ'to α'transformation and very dense cavities formed in the impact fracture effected zone(IFEZ);in case of littl γ'-phase,high cryogenic toughness is caused by the high density of hindered tiny cracks in IFEZ:while no γ'-phase,the cryogenic toughness may be poor owing to some sparse and longer cracks only.The tensile deformation ahead of the crack tip makes the lathy packet turn toward the direction being beneficial to crack tip passivation and to toughness.It is shown that the structure of materials with high toughness can adjust oneself to resist the impact load. Key words:  Ni9 steel      phase transition toughening      microcrack toughening      self-adjusting mechanism of impact resistance      Received:  18 June 1994      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/Y1994/V30/I6/239 1OokaT,MimuraH,YanoS,SuginoK,ToizumT．JJpnInstMetals,1966;20:442．2YanoS,SakuraiH,MimuraH,WakitaN,OzawaT,AokiK．Tetsu-to-Hagane,1973;59:7523SuzukiM,FujitaM．Tetsu-toHagane,1964;50:19574HardwickD．IronandSteel,1961;34:4145HasegawaM,SanoM．Instabilityoftemperedaustenitein9%nickelsteelProcICSTISSuppl6FultzB,MorrisJW．TransMet,1985;16A:1737ZhangF,HuM,LouZ,SteelResearch,1993;64:1788ZhuS,ZhangF,GuoY,shiC．SteelResearch,1990;61:236 No related articles found! No Suggested Reading articles found! Viewed Full text Abstract Cited   Shared      Discussed