冷却速率对镍基高温合金GTD222凝固及微观组织的影响

Effects of Cooling Rate on the Solidification and Microstructure of Nickel-Based Superalloy GTD222.

作者信息

Gao Bo, Sui Yanfei, Wang Hongwei, Zou Chunming, Wei Zunjie, Wang Rui, Sun Yanle

机构信息

National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.

Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

出版信息

Materials (Basel). 2019 Jun 14;12(12):1920. doi: 10.3390/ma12121920.

DOI:10.3390/ma12121920

PMID:31197116

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6631751/

Abstract

In this work, the microstructure and solidification behavior of nickel-based superalloy GTD222 at different cooling rates are studied. The solidification of the superalloy GTD222 proceeds as follows: L → L + γ, L → L + γ + MC, L → L + (γ/γ')-Eutectic and L → η phase. Due to alloying element redistribution, the temperature of the solidus GTD222 superalloy, 1310 °C, is slightly lower than the temperature of the liquidus, which is 1360 °C. It was found that the dendrite arm spacing of the alloy decreased with the increase of the cooling rate from 200 μm at 2.5 K/min to 100 μm at 20 K/min.

摘要

在这项工作中，研究了镍基高温合金GTD222在不同冷却速率下的微观结构和凝固行为。高温合金GTD222的凝固过程如下：L→L +γ，L→L +γ+ MC，L→L +（γ/γ'）共晶和L→η相。由于合金元素的重新分布，GTD222高温合金的固相线温度为1310℃，略低于液相线温度1360℃。研究发现，合金的枝晶臂间距随着冷却速率的增加而减小，从2.5K/min时的200μm减小到20K/min时的100μm。