Static coarsening behaviour of lamellar microstructure in selective laser melted Ti–6Al–4V
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第8期
论文作者：Sheng Cao Qiaodan Hu Aijun Huang Zhuoer Chen Ming Sun Jiahua Zhang Chenxi Fu Qingbo Jia Chao Voon Samuel Lim Rodney R.Boyer Yi Yang Xinhua Wu
文章页码：1578 - 1586
摘 要：Static coarsening mechanism of selective laser melted(SLMed) Ti–6Al–4V with a lamellar microstructure was established at temperatures from 700℃ to 950℃. Microstructure evolution revealed that high heat treatment temperature facilitated martensite decomposition and promoted lamellae growth. At each temperature, the growth rate decreased with increasing holding time. The static coarsening behaviour of SLMed Ti–6Al–4V can be interpreted by Lifshitz, Slyozov, and Wagner(LSW) theory. The coarsening coefficient were 0.33, 0.33–0.4, 0.4–0.5 for 700–800℃, 900℃ and 950℃, respectively. This indicated the coarsening mechanism was bulk diffusion at 700–800℃, and a combination of bulk diffusion and interface reaction at 900℃ and 950℃ conditions.
Sheng Cao1,2，Qiaodan Hu3，Aijun Huang1,2，Zhuoer Chen2，Ming Sun4，Jiahua Zhang1，Chenxi Fu2，Qingbo Jia2，Chao Voon Samuel Lim2，Rodney R.Boyer2，Yi Yang1，Xinhua Wu2
1. School of Materials Science and Engineering,University of Shanghai for Science and Technology2. Monash Centre for Additive Manufacturing (MCAM),Monash University3. School of Materials Science and Engineering,Shanghai Jiao Tong University4. School of Materials Science and Engineering (MCAM),University of Shanghai for Science and Technology
摘 要：Static coarsening mechanism of selective laser melted(SLMed) Ti–6Al–4V with a lamellar microstructure was established at temperatures from 700℃ to 950℃. Microstructure evolution revealed that high heat treatment temperature facilitated martensite decomposition and promoted lamellae growth. At each temperature, the growth rate decreased with increasing holding time. The static coarsening behaviour of SLMed Ti–6Al–4V can be interpreted by Lifshitz, Slyozov, and Wagner(LSW) theory. The coarsening coefficient were 0.33, 0.33–0.4, 0.4–0.5 for 700–800℃, 900℃ and 950℃, respectively. This indicated the coarsening mechanism was bulk diffusion at 700–800℃, and a combination of bulk diffusion and interface reaction at 900℃ and 950℃ conditions.
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