Cracking Behavior in Additively Manufactured Pure Tungsten
来源期刊：Acta Metallurgica Sinica2019年第1期
论文作者：Dian-Zheng Wang Kai-Lun Li Chen-Fan Yu Jing Ma Wei Liu Zhi-Jian Shen
文章页码：127 - 135
摘 要：In this study, near fully dense（96.5%） pure tungsten bulks were additively manufactured and the cracking behavior was investigated. A crack network with a spacing of ～100 lm was observed in the fabricated bulks. It was observed that the laser scanning strategy, which could tailor the microstructure, affected the crack distribution pattern in fabricated tungsten.The calculated surface temperature difference（7300 K） was much higher than the cracking criterion（800 K） of tungsten,indicating that cracking is almost inevitable in laser additive manufacturing of tungsten. It could be concluded that crack network formed because the cracks emerged in every laser molten track and then interconnected in the layer-by-layer building process.
Dian-Zheng Wang1，Kai-Lun Li1，Chen-Fan Yu1，Jing Ma1，Wei Liu1，Zhi-Jian Shen1,2
1. State Key Laboratory of New Ceramic and Fine Processing,School of Materials Science and Engineering, Tsinghua University2. Department of Materials and Environmental Chemistry,Arrhenius Laboratory, Stockholm University
摘 要：In this study, near fully dense（96.5%） pure tungsten bulks were additively manufactured and the cracking behavior was investigated. A crack network with a spacing of ～100 lm was observed in the fabricated bulks. It was observed that the laser scanning strategy, which could tailor the microstructure, affected the crack distribution pattern in fabricated tungsten.The calculated surface temperature difference（7300 K） was much higher than the cracking criterion（800 K） of tungsten,indicating that cracking is almost inevitable in laser additive manufacturing of tungsten. It could be concluded that crack network formed because the cracks emerged in every laser molten track and then interconnected in the layer-by-layer building process.
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