EFFECT OF CYCLIC STRESS AMPLITUDE AND MEAN STRESS ON HIGH TEMPERATURE FATIGUE LIFE OF Ni_3Al(B)ALLOY

Acta Metall Sin

1994, Vol. 30

Issue (9): 427-430 DOI:

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EFFECT OF CYCLIC STRESS AMPLITUDE AND MEAN STRESS ON HIGH TEMPERATURE FATIGUE LIFE OF Ni_3Al(B)ALLOY

LI Gang (State Key Laboratory of Fatikue and Fracture for Materials; Institute of Metal Research;Chinese Academy.of Sciences;Shenyang);GUO Jianting(Institute of Metal Research;Chinese Academy of Sciences;Shenyang);WANG Zhongguang(State Key Laboratory of Fatigue and Fracture for Materials;Institute of Metal Research;Chinese Academy of Sciences; Shenyang); I Hui; SHI Changxu(Institute of Metal Research; Chinese Academy of Sciences; Shenyang)(Manuscript received 3 November; 1993; in revised form 27 December; 1993)

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Abstract High temperature fatigue properties of a polycrystalline Ni_3Al(0.6at.-%B) alloy, being brittle at an elevated temperature, were studied. The tension-tension fatigue tests under controlled loading were carried out in air at 450 ℃. By fixing the maximum values of tensile stress in all tests but changing the minimum values of tensile stress in various tests, the effect of cyclic stress amplitude or mean stress and their interaction on the damage of materials may be differentiated. The results of cyclic stress amplitude and mean stress vs fatigue life are plotted as"S" shape and interpreted preliminarily.Correspondent: LI Gang, Institule of Metal Research, (Chinese Academy of Sciences, Shenyang 110015)

Key words: Ni_3Al(B) cyclic stress amplitude mean stress fatigue life

Received: 18 September 1994

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1994/V30/I9/427

1青木清,和泉修,日本金属学会志1979;43:11902StoloffNS,FuchsGE,KuruvillaA,ChoeSJ．In:StoloffNSetaleds,HighTemperatureOrderedIntermetallicAlloysII,MaterResSocSympProc,1987;81:2473HemkerKJ,MillsMJ,NixWD．ActaMetallMater,1991;39:l9014BellowsRS,SchwarzkopfEA,TienJK．MetallTrans,1988;19A:4795TienJK,BellowsRS．In:KochCCetaleds,HighTemperatureOrderedIntermetallicAlloysIII,MaterResSocSympProc,1989;133:255

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