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首页> 外文期刊>Materials Science and Engineering >In-situ residual stress reduction, martensitic decomposition and mechanical properties enhancement through high temperature powder bed pre-heating of Selective Laser Melted Ti6A14V
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In-situ residual stress reduction, martensitic decomposition and mechanical properties enhancement through high temperature powder bed pre-heating of Selective Laser Melted Ti6A14V

机译：通过选择性激光熔融Ti6A14V的高温粉末床预热来原位降低残余应力，马氏体分解并提高机械性能

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摘要

During the Selective Laser Melting (SLM) process large temperature gradients can form, generating a mismatch in elastic deformation that can lead to high levels of residual stress within the additively manufactured metallic structure. Rapid melt pool solidification causes SLM processed Ti6Al4V to form a martensitic microstructure with a ductility generally lower than a hot working equivalent. Post-process heat treatments can be applied to SLM components to remove in-built residual stress and improve ductility. The use of high temperature pre-heating during an SLM build can assist in reducing thermal gradients, enable a more controlled cooling with the possibility to control/tailor as-built mechanical properties. In this work a high temperature SLM powder bed capable of pre-heating to 800 °C is used during processing of Ti6A14V feedstock. The effect of powder bed temperature on residual stress formation, microstructure and mechanical properties was investigated. It was found that increasing the bed temperature to 570 °C significantly reduced residual stress formation within components and enhanced yield strength and ductility. This pre-heating temperature enabled the decomposition of α' martensitic microstructure into an equilibrium α + β microstructure. At 570 °C the yield strength and elongation of components was improved by 3.2% and 66.2% respectively.
机译：在选择性激光熔化（SLM）过程中，可能会形成较大的温度梯度，从而在弹性变形中产生不匹配现象，从而导致在增材制造的金属结构中产生高水平的残余应力。快速的熔池凝固导致SLM处理的Ti6Al4V形成马氏体微观结构，其延性通常低于热加工等效物。可以对SLM组件进行后处理热处理，以消除内置的残余应力并提高延展性。在SLM构建过程中使用高温预热可以帮助减少热梯度，实现更加可控的冷却，并有可能控制/量身定制机械性能。在这项工作中，在Ti6A14V原料加工过程中使用了能够预热至800°C的高温SLM粉床。研究了粉末床温度对残余应力形成，显微组织和力学性能的影响。已发现将床层温度提高到570°C可以显着减少组件内部残余应力的形成并提高屈服强度和延展性。该预热温度使α'马氏体组织分解成平衡的α+β组织。在570°C下，组件的屈服强度和延伸率分别提高了3.2％和66.2％。

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