Abstract
Selective laser melting at various laser inclination angles was used to prepare Hastelloy X alloy specimens. The morphology, fracture, tensile strength, stress, and strain of Hastelloy X alloy specimens were studied using optical microscopy, scanning electron microscopy, and a tensile tester. The temperature field of the manufacturing process was analyzed based on finite element analysis, and the internal relationship between the temperature field and the process was constructed in terms of cooling speed. The results show that the temperature field is a dynamic process with a high cooling rate; the average cooling rate reaches 3.23 × 106 °C × s−1. The greater the inclination angle, the greater the thermal gradient, resulting in higher cooling rates. Due to the cross-influence of grain refinement at high cooling rates and residual stress, the tensile strength and yield strength of Hastelloy X alloy showed first increasing and then decreasing trends with respect to inclination angle. However, at an inclination angle of 30°, the voids and crack defects of Hastelloy X alloy fractures were reduced, and the tensile strength and yield strength reached 881.38 and 701.60 MPa, respectively. At this angle, the mechanical properties were excellent and met the requirements of the aviation industry.
About the authors
Dr. Zong Xuewen, born in 1964, is an Associate Professor at the Xi’an University of Science and Technology, China. He obtained his PhD at the School of Mechanical Engineering at Xi’an Jiaotong University in 2008. His research interests mainly focus on laser processing and additive manufacturing. To the present, he has published over 30 technical papers and holds more than 15 invention patents in China.
Zhang Jian, born in 1994, is a Master’s Candidate at the Xi’an University of Science and Technology, China. He obtained his Bachelor’s degree at the School of Mechanical Engineering at Henan University of Science and Technology. His main research direction is laser processing and additive manufacturing, currently focusing on SLM forming in superalloys and titanium alloys.
Prof. Dr. Fu Hanguang, born in 1964, is a Professor at the Xi’an Polytechnic University and Beijing University of Technology, China. He obtained his PhD at the School of Materials Science and Engineering at Xi’an Jiaotong University in 2004. His research interests mainly focus on material processing and solidification technology. To the present, he has published over 240 technical papers and holds more than 120 invention patents in China.
Acknowledgement
This study was supported by the National Natural Science Foundation of China (51875452) and National High-tech R&D Program (863 Program) (2015AA042503).
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