Kinetics of Grain Growth in 718 Ni-Base Superalloy

Archives of Metallurgy and Materials

Z. Huda¹  S. Ibrahim²  H.S.C. Metselaar²  T. Zaharinie²  Goh J. Min² 

[1] Department Of Engineering, Nilai University, Nilai, 71800 Negeri Sembilan, Malaysia;Department Of Mechanical Engineering, University Of Malaya, 50603 Kuala Lumpur, Malaysia

关键词: Keywords: Nickel-base superalloy;    microstructures;    grain growth;    kinetics;    activation energy;   

DOI  :  10.2478/amm-2014-0143

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The Haynes® 718 Ni-base superalloy has been investigated by use of modern material characterization, metallographic and heat treatment equipment. Grain growth annealing experiments at temperatures in the range of 1050 – 1200 oC (1323–1473K) for time durations in the range of 20 min-22h have been conducted. The kinetic equations and an Arrhenius-type equation have been applied to compute the grain-growth exponent n and the activation energy for grain growth, Qg, for the investigated alloy. The grain growth exponent, n, was computed to be in the range of 0.066-0.206; and the n values have been critically discussed in relation to the literature. The activation energy for grain growth, Qg, for the investigated alloy has been computed to be around 440 kJ/mol; and the Qg data for the investigated alloy has been compared with other metals and alloys and ceramics; and critically analyzed in relation to our results.

【 授权许可】

Unknown