Different effects of multiscale microstructure on fatigue crack growth path and rate in selective laser melted Ti6Al4V
Zhao Qi
Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, China
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Search for more papers by this authorBin Wang
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Search for more papers by this authorCorresponding Author
Peng Zhang
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Correspondence
Peng Zhang and Zhefeng Zhang, Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Email: [email protected] and [email protected]
Search for more papers by this authorRiu Liu
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Search for more papers by this authorZhenjun Zhang
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Search for more papers by this authorCorresponding Author
Zhefeng Zhang
Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, China
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Correspondence
Peng Zhang and Zhefeng Zhang, Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Email: [email protected] and [email protected]
Search for more papers by this authorZhao Qi
Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, China
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Search for more papers by this authorBin Wang
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Search for more papers by this authorCorresponding Author
Peng Zhang
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Correspondence
Peng Zhang and Zhefeng Zhang, Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Email: [email protected] and [email protected]
Search for more papers by this authorRiu Liu
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Search for more papers by this authorZhenjun Zhang
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Search for more papers by this authorCorresponding Author
Zhefeng Zhang
Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, China
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Correspondence
Peng Zhang and Zhefeng Zhang, Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Email: [email protected] and [email protected]
Search for more papers by this authorFunding information: National Natural Science Foundation of China, Grant/Award Number: 52130002; Youth Innovation Promotion Association of the Chinese Academy of Sciences, Grant/Award Numbers: 2018226, 2021192; IMR Innovation Fund, Grant/Award Numbers: 2021-PY05, 2022-PY06; K. C. Wong Education Foundation, Grant/Award Number: GJTD-2020-09
Abstract
During the selective laser melting (SLM) process of Ti6Al4V, a special structure can be formed with columnar prior β grains along the building direction and fully martensitic α′ within the β grain. To investigate the influence of such special structure on the fatigue crack growth (FCG) rate, Ti6Al4V specimens fabricated by SLM were heat-treated at two different temperatures in this study. The columnar grains were retained, and the martensite was decomposed when heat-treated below the β transus. It is found that all the SLM features were removed when heat-treated above the β transus. FCG rate tests were subsequently performed at room temperature, and it was found that the prior β grains affected the macroscopic fracture morphology, but there was no discernible influence on the FCG rate. The morphology of the α phase affected the crack growth path and the FCG rate. Changes in the strength-toughness relationship induced by heat treatment can help understand the decrease in the FCG rate.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Open Research
DATA AVAILABILITY STATEMENT
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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