Effect of Titanium Addition on Microstructure and Mechanical Properties of Inconel 713LC Superalloy

• Main Authors: WEI, LI-CHIA, 魏立家
• Other Authors: CHEN, SHIH-FAN
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/9939jt

碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 107 === Inconel 713LC has good mechanical properties at temperature below 700 ℃ and low manufacturing cost, and is now widely used in the increasingly popular turbine blades of vehicles. However, although the turbine for vehicles has the advantage of increasing horsepower and reducing the amount of exhaust, there is an inevitable turbo lag. Therefore, in this study, the Inconel 713LC superalloy was lightened by adding lighter element like titanium to Inconel 713LC, and the effect of titanium addition on Inconel 713LC on microstructure and mechanical properties was investigated. In this study, there are four kinds of test rods was prepared, and the titanium contents are 0.52 wt%, 1.52 wt%, 2.85 wt%, and 4.42 wt%, respectively. The addition of titanium can indeed reduce the overall density of the alloy, from 7.8750 g/cm3 to 7.7561 g/cm3, and the density is reduced by at most 1.6%. The addition of titanium increases the area fraction of the precipitated phase γ' and the eutectic phase γ-γ' in the alloy, resulting in a significant increase in the hardness of the material. The addition of titanium also makes the MC-type carbide distribution more dispersed and the morphology changes from a long strip to a spherical shape, which can enhance the grain boundary strength, inhibit crack growth and strengthen mechanical properties. In the mechanical property test, when the titanium content is 2.85 wt%, the best tensile strength at medium temperature is 1130 MPa; And the titanium content is 1.52wt%, the best optimum tensile strength is 475 MPa. In the creep test, the longest breaking time was 92.2 hours when the titanium content was 1.52 wt%, which was significantly higher than the breaking time of the base material of 66.0 hours.