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首页> 外文会议>National Conference on Vacuum Heat Treatment >Choosing a Suitable Heat Treatment Regime for Stress-Relief and Microstructure Stabilization of Ti6Al4V Alloy 3D-Printed by SLM Method
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Choosing a Suitable Heat Treatment Regime for Stress-Relief and Microstructure Stabilization of Ti6Al4V Alloy 3D-Printed by SLM Method

机译：选择合适的热处理制度，用于通过SLM方法进行应力 - 浮雕和微观结构稳定稳定

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摘要

During the processing of Ti6Al4V alloy by a 3D printing method SLM (selective laser melting), high internal stresses are developed in the material as a result of high temperature gradients between microvolumes of the powder melted at a given time and the already solidified material. Cooling rates thus reach up to the order of 10~8 °C·s~(-1). At such rates, a diffusionless martensitic transformation occurs, which also contributes to internal stresses in the material. High internal stresses can be a problem already during production; they can manifest themselves by cracking of products, deformations of thin parts, etc. Even in defectless products, internal stresses negatively affect their properties; in particular, they reduce ductility. Therefore, it is desirable to include a heat treatment after the 3D printing, which would reduce the stresses and transform the metastable martensitic structure into a stable one. As a result of the heat treatment, the ductility increases at the expense of strength. The subject of this paper is to find such heat treatment regime that provides the best combination of mechanical properties.
机译：在通过3D打印方法SLM（选择性激光熔化）的Ti6Al4V合金的处理期间，由于在给定时间和已经凝固的材料在给定时间和已经凝固的材料的微扫描的微胃之间的高温梯度，在材料中开发高内应力。因此，冷却速率达到10〜8°C·S〜（-1）的顺序。在这样的速率下，发生扩散的马氏体转化，这也有助于材料中的内部应力。高内部应力可能是在生产过程中存在的问题;它们可以通过开裂产品，薄零件的变形等表现出来。即使在缺陷的产品中，内部应力对其性质产生负面影响;特别是，它们减少了延展性。因此，希望在3D打印之后包括热处理，这将减少应力并将亚稳态马氏体结构转变为稳定的。作为热处理的结果，延展性以牺牲强度的牺牲增加而增加。本文的主题是寻找这种热处理制度，提供机械性能的最佳组合。

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