硼添加對超合金IN713LC機械性質及微觀結構之影響

The Effect of Boron Addition on the Mechanical Properties and Microstructure of Superalloy IN713LC

沈俊傑(J. J. Shen) ； 魏立家(L. C. Wei) ； 吳文華(W. H. Wu) ； 王錫九(S. J. Wang) ； 陳適範(S. F. Chen) ； 薄慧雲(H. Y. Bor) ； 魏肇男(C. N. Wei)

《鑄造工程學刊》 44卷4期 (2018/12) Pp. 7-12

摘要

隨著環保意識的提升，汽車引擎加裝渦輪增壓器越來越普及，鎳基超合金IN713LC為目前常用之材料，因此增加IN713LC的高溫強度，開發出低成本之汽車渦輪引擎材料為本研究之目的。本研究以真空感應熔解精密鑄造出IN713LC鎳基超合金，經過拉伸試驗發現，在982℃高溫下，硼的添加對於IN713LC合金的高溫強度有顯著提升，0.012wt%硼含量時相較於母材，抗拉強度提升了10%、降伏強度提升了12%；0.015wt%硼含量時相較於母材，抗拉強度提升了14%、降伏強度提升了18%。藉由顯微組織分析，發現添加硼後，碳化物形態改變，並在共晶相附近有硼化物生成，對機械性質影響甚鉅。

關鍵字

鎳基超合金 ； 顯微組織 ； 真空感應熔解

並列摘要

Turbochargers have become more and more popular in automobile with the increasing awareness of environmental protection. Nickel-based superalloy IN713LC is used as a material for turbochargers currently. Therefore, increasing the high temperature strength of the IN713LC is the purpose of this study. In this study, the IN713LC nickel-based superalloy was successfully cast by vacuum induction melting (VIM). The test results indicate that the addition of boron has a significant increase in the high temperature strength of the IN713LC at 982 °C. When the boron content is 0.012 wt%, the tensile strength has increased by 10% and the yield strength by 12%, compared to the base material. When the boron content is 0.015 wt%, the tensile strength has increased by 14% and the yield strength by 18%, compared to the base metal. It was found that boron is enriched in carbides at the grain boundaries or borides are formed around the eutectic phase after analysis of the microstructure by Scanning Electron Microscopy (SEM) and Electron Probe Microanalyzer(EPMA). When carbides or borides are discontinuously distributed at the grain boundaries, they can strengthen the grain boundaries and increase the high temperature mechanical properties of the material.

並列關鍵字

Nickel based superalloys ； Microstructure ； Vacuum induction melting (VIM)