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Effect of stress ratio on very high cycle fatigue properties of ti-10v-2fe-3al alloy with duplex microstructure

Journal of Materials Science & Technology 2018年第7期34卷 1189-1195页

作者： Ying Wu Jianrong Liu Hao Wang Shaoxuan Guan Rui Yang Hongfu Xiang Institute of Metal Research Chinese Academy of Sciences National Demonstration Center for Experimental Materials Science and Engineering Education Jiangsu University of Science and Technology

In fatigue critical applications, ti-10v-2fe-3al alloy components are expected to endure cyclic loading with cycles above 109. To assess their operating safety, S-N relations of ti-10v-2fe-3al alloy in very high cycle fatigue （vHCF） regime are of concern and have been investigated in this work. Fatigue behavior including S-N curves and crack initiation mechanisms is reported. Two transitions of fatigue crack initi- ation mechanism, from internal crack initiation to surface crack initiation and from αp cleavage to αS/β decohesion, occur when the stress ratio （R） and stress level are reduced. Fatigue limits exist at Nr = 6×10^7 cycles for all stress ratios except for 0.5. In the vHCF regime two kinds of internal crack initiation mechanisms exist, i.e., coalescence of cluster of αp facets and αS/β decohesion. Their mutual competition depends on the stress ratio and can be interpreted in terms of different stress character required for promotion on different internal crack initiation mechanism. Small crack propagation is discussed to be life controlling process under the stress ratio range from -0.5 to 0.1 during vHCF regime while under the stress ratio 0.5 vHCF, life almost refers to the life required for crack initiation.2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： ti-10v-2fe-3al alloy very high cycle fatigue S-N curve Fatigue crack initiation Life controlling process

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EFfeCT OF β-FLECKS ON MECHANICal PROPERtiES OF ti-10v-2fe-3al alloy

引用

Acta Metallurgica Sinica(English Letters) 1993年第3期6卷 197-201页

作者： ZHOU Yigang YU Hanqing ZENG Weidong Northwestern Polytechnical University,Xi’an,ChinaTANG Jialin China South Aviation Motive Power and Machinery Company,Zhuzhou,China professor,Department of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China Northwestern Polytechnical Univ Xi'an China

Effect of β-flecks on properties of tensile elongation and low *** life at room tern. perature for ti-10v-2fe-3al alloy has been *** cracks along initial β-grain boundaries in the β-fleck region may propagate to form intergranular brittle *** alternating load,the β-fleck often becomes a fatigue *** under higher strain,the cracks initiate and propagate to fracture early at the original β-grain boundaries in β-fleck region and at α-grain boundaries.

关键词： ti-10v-2fe-3al alloy β-fleck tensile property low cycle fatigue life

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