Effect of Cr on eutectic phase formation and solidification temperature range in Ni-Cr-Hf system

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• 作者：Xiuli Feng ; Adam Hope ; John C. Lippold
• 关键词：Eutectic phase ; Solidification temperature range ; Ni&ndash ; Cr&ndash ; Hf alloy
• 刊名：Materials Letters
• 出版年：1 February, 2014
• 年：2014
• 卷：116
• 期：Complete
• 页码：79-81
• 全文大小：805 K

文摘

In order to obtain eutectic phases which are beneficial for reducing ductility dip cracking and solidification cracking susceptibility in Ni-base alloys during non-equilibrium solidification (such as welding), samples with Ni-5Hf and different Cr levels were made using a button melting method. The relevant eutectic phases in the Ni-Cr-Hf system were identified. The solidification temperature range (STR) was determined by experimental Single Sensor Differential Thermal Analysis. It was found that 纬/Ni₅Hf eutectic formed in the Ni-0Cr, Ni-5Cr and Ni-10Cr system, while 纬/Ni₇Hf₂ eutectic formed in the Ni-20Cr and Ni-30Cr system. Formation of the 纬/Ni₇Hf₂ eutectic was responsible for a narrower STR, which indicates a better resistance to solidification cracking.