Transactions of Materials and Heat Treatment

Title：Ultra-high cycle fatigue behavior for Ti6Al4V titanium alloy blade formed by selective laser melting

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ClassificationCode：TG316

year,vol(issue):pagenumber：2020,45(11):89-93

Abstract：

Poor fatigue life is the main bottleneck that restricts the wide application of selective laser melting (SLM) parts in the aviation field. Therefore, the ultra-high cycle fatigue properties and fracture mechanism of Ti6Al4V titanium alloy blade by SLM were studied by ultrasonic fatigue test method, and the microstructure and fatigue fracture morphology of Ti6Al4V titanium alloy blade were observed by metallographic microscope and scanning electron microscope respectively. The test results show that with the decreasing of stress amplitude, the fatigue life of Ti6Al4V titanium alloy blade formed by SLM shows a linear upward trend, and the fatigue strength is 280 MPa under the fatigue life of 109. Furthermore, there is a competitive mechanism in the initiation position of ultra-high cycle fatigue crack in Ti6Al4V titanium alloy blade formed by SLM, that is, the internal and subsurface competition initiation. In addition, the hole defect of material ultimately determines the crack initiation position and growth rate, and the size of hole defect directly determines the fatigue life.

Funds：

四川省科技厅项目（2019YJ0519）；中国博士后基金 (2019M653396)；四川大学-自贡政府战略合作支持项目 (2019CDZG-4)；四川大学-宜宾政府战略合作支持项目(2019CDYB-24)；四川大学博士后基金(2019SCU12056)

门正兴（1980-），男，博士，高级工程师，教授 E-mail：amen1980@163.com

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