东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (5): 630-633.DOI: 10.12068/j.issn.1005-3026.2018.05.005

• 材料与冶金 • 上一篇    下一篇

分步退火及初始晶粒对Hastelloy C-276合金晶界特征分布影响

张晓宇1,2， 赵宪明1， 李德富2， 郭胜利2   

  1. (1. 东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819; 2. 北京有色金属研究总院 复合材料中心， 北京100088)
  • 收稿日期:2016-12-28 修回日期:2016-12-28 出版日期:2018-05-15 发布日期:2018-05-25
  • 通讯作者: 张晓宇
  • 作者简介:张晓宇(1985 -)，男，山西孝义人，东北大学博士研究生； 赵宪明(1965-)，男，辽宁桓仁人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51205028)

Effects of Two-Step Annealing and Initial Grain Size on the Grain Boundary Character Distributions of Hastelloy C-276

ZHANG Xiao-yu1,2， ZHAO Xian-ming1， LI De-fu2， GUO Sheng-li2   

  1. 1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China; 2. Center for Composites， General Research Institute for Non-ferrous Metals， Beijing 100088， China.
  • Received:2016-12-28 Revised:2016-12-28 Online:2018-05-15 Published:2018-05-25
  • Contact: ZHAO Xian-ming
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摘要： 不同初始晶粒尺寸的 Hastelloy C-276 合金经冷轧变形后，分别采用一次退火和二次退火方法进行热处理，其晶界特征分布采用电子背散射衍射技术进行表征.结果表明，初始较大晶粒组织有利于晶界特征分布的优化，特殊晶界比例比小尺寸晶粒组织提高了近10%，达到了78.8%，同时形成了平均尺寸为200μm晶粒团簇组织.在相同晶粒尺寸条件下，采用二次退火工艺可以明显改善合金的晶界特征分布，∑3○n晶界比例得到较大幅度的提高，并形成了良好的团簇组织.这是由于较多的非共格∑3晶界，容易产生∑9和∑27晶界，从而形成更多的三叉晶界，阻断了大角度晶界的连通性.

关键词: 二次退火热处理, 初始晶粒, Hastelloy C-276合金, 特殊晶界, 晶界特征分布

Abstract: Hastelloy C-276 samples with different initial grain sizes were subjected to one-step and two-step annealing heat treatments after cold-rolling process and their grain boundary character distributions (GBCDs) were characterized by electron backscatter diffraction (EBSD) techniques. The results show that the large-sized initial grains tend to optimize the GBCD. Compared with that in the small-sized grain ones， the fraction of coincident site lattice (CSL) boundary in Hastelloy C-276 samples with large-sized initial grains increases nearly 10%， which is up to 78.8%. Meanwhile， the clusters with average size of 200μm are formed. For the samples with same-sized grains， the GBCD can be well improved by the two-step annealing treatment， where the fraction of ∑3○n boundaries can be increased significantly and the better clusters can be formed. The more incoherent ∑3 boundaries， the more ∑9 and ∑27 boundaries can be generated， leading to the more triple junctions. Therefore， the connectivity of the high-angle grain boundary network is disrupted effectively.

Key words: two-step annealing heat-treatment, initial grain size, Hastelloy C-276 alloy, special grain boundary, grain boundary character distribution(GBCD)

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