Transactions of Materials and Heat Treatment

Title：Evolution analysis on in-situ tensile microstructure of Ti600 alloy manufactured by laser additive for internal combustion engine

Authors： Zheng Huahui Lyu Jun Yu Zhenyu

Unit： Yan′an Vocational and Technical College Beijing Juxing Composite Material Technology Development Co. Ltd. China University of Petroleum (Beijing)

KeyWords： laser additive manufacturing Ti600 alloy in-situ tensile β grain boundary crack evolution mechanism

ClassificationCode：TG146

year,vol(issue):pagenumber：2020,45(5):180-184

Abstract：

In order to improve the comprehensive performance of Ti600 alloy manufactured by laser additive for internal combustion engine, the in-situ tensile mechanics test was conducted, and the generation, propagation and fracture of microcracks were observed more accurately to analyze the microstructure and the crack evolution mechanism under different in-situ tensile displacements. The results show that the columnar β crystals with coarse size are formed in Ti600 alloy manufactured by laser additive, and the growth direction is consistent with the structure accumulation direction. Furthermore, the β grain boundaries present a state of vertical growth, and a large number of lath-type α crystals and α-cluster structures with the same growth direction are formed in the region near β crystals. When the in-situ tensile displacement increases, the crack extends upward along β grain boundaries to form the crack inclining to β grain boundaries. The randomly arranged grains are formed in the alloy, and the slip direction is obviously different to lead to the formation of cross slip zone when the displacement increases. Thus, the above research provides a certain reference value for optimizing the process method and improving the properties of Ti600 alloy manufactured by laser additive.

Funds：

北京市自然科学基金资助项目(3162027)

郑华辉（1966-），男，工学硕士，副教授，E-mail：jishunpang694807@126.com

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