超超临界汽轮机转子用新型镍基合金晶粒长大行为研究-中国材料进展

文章信息/Info

Title:: Research on Grain Growth Behavior of New Nickel-Based Alloy for Ultra-Supercritical Turbine Rotor

作者:: 张冰冰; 白亚冠; 聂义宏; 张鑫; 寇金凤; 李红梅; 傅万堂; 1. 中国第一重型机械股份公司，黑龙江齐齐哈尔 161042 2. 天津重型装备工程研究有限公司，天津 300457 3. 燕山大学材料科学与工程学院，河北秦皇岛 066099

Author(s):: Zhang Bingbing; Bai Yaguan; Nie Yihong; Zhang Xin; Kou Jinfeng; Li Hongmei; Fu Wantang; 1. China First Heavy Industries Co., Ltd., Qiqihar 161042, China) 2. Tianjin Heavy Industries Research & Development Co., Ltd., Tianjin 300457, China 3. School of Materials Science and Engineering, Yanshan University,Qinhuangdao 066099, China

摘要:: 针对新型镍基合金C650R晶粒长大行为进行分析，并构建了合金的晶粒长大模型。利用光学显微镜、扫描电子显微镜及能谱仪对合金材料进行分析，结果显示：随着加热温度的升高，合金的晶粒尺寸逐渐增加，当温度高于1100 ℃，晶粒长大明显，1100 ℃为晶粒长大拐点；当保温时间小于10 h，晶粒尺寸变化不明显，保温时间为20 h时，随着加热温度的升高，晶粒尺寸显著增加。通过观察合金微观组织发现，随着加热温度的升高和保温时间的延长，C650R合金晶界和晶内的碳化物数量不断减少，晶界碳化物的钉扎作用逐渐减弱，晶界迁移阻力减小，晶粒开始逐渐长大。基于Sellars模型建立了合金的晶粒长大模型，误差较小，能很好地描述合金的晶粒长大过程。

Abstract:: The grain growth behavior of the new nickelbased alloy C650R was analyzed and a grain growth model of the alloy was constructed. During the experiment, the alloy was analyzed using optical microscopy, scanning electron microscopy and energy dispersive spectroscopy. The results show that the grain size of the alloy increases gradually with the increase of heating temperature. When the temperature is higher than 1100 ℃, the grain growth is obvious, which is the inflection point of grain growth. When the holding time is less than 10 h, the grain size does not change significantly. When the holding time is 20 h, the grain size increases significantly with the increase of temperature. By observing the microstructure of the alloy, it is found that with the increase of heating temperature and holding time, the number of carbides in the grain boundaries and crystals of C650R alloy decreases continuously, and the pinning effect of the grain boundaries carbides is gradually weakened, which results in the grain getting rid of the pinning effect to begin to grow gradually. The grain growth model of the alloy was established based on the Sellars model with a small error, which can well describe the grain growth process of the alloy.