铼对镍基单晶高温合金恒温氧化行为的影响

doi:10.11901/1005.3093.2016.575

材料研究学报

2017, Vol. 31

Issue (9): 695-702 DOI: 10.11901/1005.3093.2016.575

研究论文

本期目录 | 过刊浏览

铼对镍基单晶高温合金恒温氧化行为的影响

常剑秀¹, 王栋²(

), 董加胜², 王迪², 吴汉昌³, 张功², 楼琅洪²

1 西安石油大学材料科学与工程学院西安 710065
2 中国科学院金属研究所沈阳 110016
3 中国航发贵阳中航动力精密铸造有限公司贵阳 550014

Effect of Rhenium Addition on Isothermal Oxidation Behavior of a Nickel-base Single Crystal Superalloy

Jianxiu CHANG¹, Dong WANG²(

), Jiasheng DONG², Di WANG², Hanchang WU³, Gong ZHANG², Langhong LOU²

1 College of Materials Science and Engineering, Xi?an Shiyou University, Xi?an 710065, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 Guiyang AECC Power Investment Casting Ltd. Co., Guiyang 550014, China

引用本文:

常剑秀, 王栋, 董加胜, 王迪, 吴汉昌, 张功, 楼琅洪. 铼对镍基单晶高温合金恒温氧化行为的影响[J]. 材料研究学报, 2017, 31(9): 695-702.
Jianxiu CHANG, Dong WANG, Jiasheng DONG, Di WANG, Hanchang WU, Gong ZHANG, Langhong LOU. Effect of Rhenium Addition on Isothermal Oxidation Behavior of a Nickel-base Single Crystal Superalloy[J]. Chinese Journal of Materials Research, 2017, 31(9): 695-702.

全文: PDF(1602 KB) HTML

摘要:

采用不连续增重法研究了Re对一种镍基单晶高温合金1000℃恒温氧化行为的影响,采用扫描电镜(SEM)和X射线衍射分析仪(XRD)对样品的组织进行了观察。结果表明,两种合金生成的氧化膜成分相似,都生成了以含Cr、Ti氧化物为主的外氧化层、Al₂O₃内氧化层以及含有TiN的内氮化层。但二者氧化速率及氧化层结构存在较大差异,含Re合金的氧化速率较慢,Al₂O₃层较完整且TiN数量较少。Re的作用机理在于它提高了合金中Cr的活度,增大氧化膜中Cr₂O₃的含量,加快Al的选择性氧化,促进合金氧化膜内部连续Al₂O₃层的形成,抑制合金内部氮化物的生成,提高长期氧化下氧化膜的稳定性。

关键词 ：金属材料, 镍基单晶高温合金, 高温氧化, Re, 活度, 选择性氧化

Abstract：

Effect of rhenium (Re) addition on isothermal oxidation behavior of a nickel-base single crystal superalloy was investigated by means of intermittent measurement of weight change as well as scanning electron microscope (SEM) and X-ray diffractometer (XRD). It was shown that, a scale composed of a (Cr, Ti)-enriched outer oxide layer, an inner Al₂O₃ layer and an inner TiN layer was formed for both the Re-containing and Re-free alloys, however, the Al₂O₃ layer was much more complete and the amount of TiN was much less on the Re-containing alloy rather than those on the Re-free alloy. Re was found to lower the oxidation rate of the alloy and improve the stability of the entire oxide scale during long-term oxidation by increasing the activity of Cr and thus increasing the content of Cr₂O₃ in the scale. Enhancement of Cr₂O₃formation may then accelerate the selective oxidation of Al and thus promote the formation of a continuous Al₂O₃ layer beneath the outer oxide scale, as a result, which inhibited the formation of the inner nitride.

Key words： metallic materials nickel-base single crystal superalloy high temperature oxidation rhenium (Re) activity selective oxidation

收稿日期: 2016-09-30

ZTFLH:

TG172.3

基金资助:国家自然科学基金(51631008)和国家重点研发计划(2016YFB0701403)

作者简介:

作者简介常剑秀,女,1989年生,讲师

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.575 或 https://www.cjmr.org/CN/Y2017/V31/I9/695

表1 实验合金的名义成分及实测成分

图1 E1和E7单晶合金的标准热处理组织

图2 E1 (12Cr-0Re)和E7 (12Cr-2Re)单晶合金在1000℃的恒温氧化动力学曲线

图3 E1和E7单晶合金在1000℃恒温氧化后的宏观形貌

表2 E1和E7单晶合金在1000℃恒温氧化产物的XRD分析结果

图4 E1和E7单晶合金在1000℃恒温氧化不同时间后的表面形貌

表3 图4中“A”和“B”区域的EDS结果

图5 E1单晶合金在1000℃恒温氧化不同时间后的截面形貌

表4 图5中“A”、“B”、“C”、“D”和“E”区域的EDS结果

图6 E7单晶合金在1000℃恒温氧化不同时间后的截面形貌

表5 图6中“A”、“B”、“C”和“D”区域的EDS结果

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