Change in Mechanical Properties of Ti-6Al-4V ELI during Fatigue Failure Process
Change in Mechanical Properties of Ti-6Al-4V ELI during Fatigue Failure Process
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Ti-6Al-4V ELI 疲劳失效过程中力学性能的变化
DOI：
10.2320/jinstmet1952.62.2_140
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发表时间：
1998
影响因子：
--
通讯作者：
Atsushi Ozeki
中科院分区：
文献类型：
--
作者：
T. Akahori;M. Niinomi;Atsushi Ozeki
Mechanical properdes of biomedical Ti−6Al−4V ELI with equiaxed and Widmanstattenαstructures at various fatigued steps were investigated． Fatigue crack initiation characteristics of the same alloy were also investigated hl this study． The fatigue crack initiates mahlly at the interface between prima】了αgrains in equiaxedαstructure while that 血itiates in the colony along about 45。 dlrec廿on versus stress ax三s in Widmans蹴teRαstructure． The specimen 輌th Widmanstattenαstructure fractures before adequate fatigue hardening because a Iot of micro−cracks are easily formed while the specimen with equiaxedαstructure fractures after adequate fatigue hardening． The mechanical properties， that is， tensHe strength a皿d hardness tend to hlcrease clearly according to the fatigue steps in particular in the low cycle fatigue（LCF）region， while lmpact toughness and elongation show the reverse trend． The hardness far from the specimen surface is greater than that near the spec三men surface at the early stage of LCF． Both hardness is however nearly equal each other at the Iatter stage of fatigue． It can be understood therefore that the dislocation multiplies near the specimen s㎡ace at the early stage of fatigue while at the latter stage of fatigue，