Methodology for Studying Effect of Cooling Rate During Laser Deposition on Microstructure

Abstract

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.

Department(s)

Materials Science and Engineering

Second Department

Mechanical and Aerospace Engineering

Keywords and Phrases

Deposition; Mechanical Properties; Microstructure; Substrates; Tensile Strength; Thermocouples; Cooling Rates; Deposition Process; Laser Depositions; Local Temperature; Microstructure and Mechanical Properties; Processing Variables; Room Temperature; Titanium Ti-6Al-4V; Cooling

International Standard Serial Number (ISSN)

1059-9495

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Springer Verlag, All rights reserved.

Publication Date

01 Aug 2015

Link to Full Text

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