Relation between the fracture laws and the fatigue life of a surface-hardened pseudo-α titanium alloy

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• 作者：V. P. Bagmutov ; V. I. Vodop’yanov ; I. N. Zakharov…
• 刊名：Russian Metallurgy (Metally)
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：2016
• 期：7
• 页码：663-668
• 全文大小：1,295 KB
• 刊物主题：Metallic Materials;
• 出版者：Springer US
• ISSN：1555-6255
• 卷排序：2016

文摘

The laws of fracture and fatigue life of the PT-3V pseudo-α titanium alloy subjected to surface hardening using electromechanical, ultrasonic, and combined treatment are studied. Fracture mechanisms and the structures of crack nucleation and growth zones are described using the results of metallographic and fractographic analysis of samples after fatigue tests. It is shown that the existence of a thin hardened layer on the sample surface changes the crack nucleation time and the state of fracture surface in the crack nucleation zone. This surface is characterized by signs of brittle or ductile fracture, which substantially affects the fatigue life of the sample.