Inconel 740H合金750℃长期时效后的组织稳定性

doi:10.11868/j.issn.1001-4381.2016.09.009

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摘要

对Inconel 740H合金管材在750℃进行500~3000h的无应力时效实验，采用热力学模拟，OM，FEG-SEM，显微硬度测定等方法研究了合金微观组织及显微硬度的变化趋势。结果表明：供货态（固溶处理）管材的合金成分及拉伸性能等均满足ASME要求，管材合格；长期时效后合金的主要析出相为γ'及M₂₃C₆，无η，σ等有害相析出。随着时效时间的延长，γ'粒子的粗化速率较快，其规律符合LSW熟化理论，M₂₃C₆相尺寸变化不明显；合金的显微硬度呈现先上升后下降的变化趋势，但整体波动较小。长期时效后合金组织及显微硬度的变化表明Inconel 740H在750℃/3000h条件下的组织稳定性较好，可用于进一步进行持久等长时力学性能的检验。

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	党莹樱
	赵新宝
	尹宏飞
	鲁金涛
	袁勇
	杨珍
	谷月峰

关键词 ： Inconel 740H, 长期时效, 组织稳定性, 显微硬度

Abstract：

Unstressed exposure tests of Inconel 740H alloy tube were carried out at 750℃ for 500-3000h. The microstructure evolution and microhardness were studied by means of thermodynamic simulation, OM, FEG-SEM and microhardness testing. The results show that the tube is qualified if both chemical composition and tensile properties of the as-received alloy meet the corresponding requirements of ASME. After long term exposure, the main precipitates are γ' and M₂₃C₆, and no η and σ phase. With the prolonging of exposure time, the coarsening of γ' becomes faster and the law of relationship between the radius of γ' and time accords with LSW Ostwald ripening law; meanwhile, the change in size of M₂₃C₆ is not so obvious. During the whole process, microhardness increases firstly and then decreases, but the fluctuation is slight. The changes of microstructure and hardness indicate that, after long time exposure, the domestic Inconel 740H has good stability and can be used for further carrying out the investigation on the mechanical property of creep-rupture.

Key words： Inconel 740H long term exposure microstructure stability microhardness

收稿日期: 2014-12-26 出版日期: 2016-09-27

中图分类号:

TG132

基金资助:国家自然科学基金资助项目(51401164)

通讯作者: 党莹樱 E-mail: dyy1630@126.com

作者简介: 党莹樱(1986-), 女, 工学博士, 主要从事高温材料组织与寿命方面的研究工作, 联系地址:陕西省西安市兴庆路136号西安热工研究院有限公司工程研究中心(710032), E-mail:dyy1630@126.com

引用本文:

党莹樱, 赵新宝, 尹宏飞, 鲁金涛, 袁勇, 杨珍, 谷月峰. Inconel 740H合金750℃长期时效后的组织稳定性[J]. 材料工程, 2016, 44(9): 58-62.
Ying-ying DANG, Xin-bao ZHAO, Hong-fei YIN, Jin-tao LU, Yong YUAN, Zhen YANG, Yue-feng GU. Microstructure Stability of Inconel 740H Alloy After Long Term Exposure at 750℃. Journal of Materials Engineering, 2016, 44(9): 58-62.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.09.009 或 http://jme.biam.ac.cn/CN/Y2016/V44/I9/58

Table 1 In 740H合金化学成分(质量分数/%)

Table 2 固溶态In 740H合金的室温拉伸性能

Fig.1 In 740H合金平衡态组织

Table 3 In 740H合金800℃平衡状态下各相成分(原子分数/%)

Fig.2 In 740H管材经标准热处理后的显微组织(a)OM；(b)晶界M₂₃C₆SEM照片；(c)晶内γ′SEM照片

Fig.3 750℃长期时效后γ′相的二次电子像(a)500h；(b)935h；(c)3000h

Fig.4 In 740H合金750℃长期时效过程中γ′的长大规律

Fig.5 750℃长期时效后晶界M₂₃C₆相的二次电子像(a)500h；(b)935h；(c)3000h；(d)图(a)中A点的EDS谱图

Fig.6 In 740H合金显微硬度随时效时间的变化趋势

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