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首页> 外文期刊>Journal of Materials Engineering and Performance >Methodology for Studying Effect of Cooling Rate During Laser Deposition on Microstructure
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Methodology for Studying Effect of Cooling Rate During Laser Deposition on Microstructure

机译：研究激光沉积过程中冷却速率对微结构影响的方法

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摘要

The present paper focuses on the effect of cooling rate and other processing variables on microstructure and mechanical properties. A specially designed, namely "step shape," was used in the current study. The influences of the step thickness were investigated. Results show that the cooling rate is different at different steps and changes the solidification of the deposition process. The cooling rate was deliberately controlled by employing the substrate of varied dimensions. Thermocouples were used to measure the local temperature of the substrate during the deposition process and cooling stage until it reached room temperature. The results of the temperature-time relationship proved the difference in cooling rate. The influence of the substrate dimension on the microstructure and mechanical properties was investigated. The differed cooling rate led to varied grain size and resulted in affected varied hardness and tensile strength. The small samples possessed larger grains sizes formed by a slower cooling rate. The results open the possibility to acquire continuous varied microstructure and mechanical properties by employing a "step shape" substrate.
机译：本文着重于冷却速率和其他工艺变量对组织和力学性能的影响。在当前的研究中使用了一种特殊设计的“台阶形状”。研究了台阶厚度的影响。结果表明，不同步骤的冷却速率不同，并且改变了沉积过程的凝固。通过采用不同尺寸的基板来有目的地控制冷却速度。在沉积过程和冷却阶段，直到达到室温之前，都使用热电偶来测量基板的局部温度。温度-时间关系的结果证明了冷却速率的差异。研究了基底尺寸对显微组织和机械性能的影响。不同的冷却速率导致变化的晶粒尺寸，并导致变化的硬度和抗张强度。小样品具有较大的晶粒尺寸，这是由较慢的冷却速率形成的。结果为通过采用“阶梯形”基底获得连续变化的微观结构和机械性能提供了可能性。

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