<strong>316L</strong>钢表面低活性<strong>Fe-Al</strong>涂层的制备

doi:10.11901/1005.3093.2023.577

材料研究学报

2024, Vol. 38

Issue (11): 801-810 DOI: 10.11901/1005.3093.2023.577

研究论文

本期目录 | 过刊浏览

316L钢表面低活性Fe-Al涂层的制备

陈继弘¹^,³, 王永利²^,³(

), 熊良银²^,³, 宋立新¹

1 沈阳化工大学材料科学与工程学院沈阳 110142
2 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016
3 中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016

Preparation of Low Activity Fe-Al Coating on 316L Steel Surface

CHEN Jihong¹^,³, WANG Yongli²^,³(

), XIONG Liangyin²^,³, SONG Lixin¹

1 College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
2 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

陈继弘, 王永利, 熊良银, 宋立新. 316L钢表面低活性Fe-Al涂层的制备[J]. 材料研究学报, 2024, 38(11): 801-810.
Jihong CHEN, Yongli WANG, Liangyin XIONG, Lixin SONG. Preparation of Low Activity Fe-Al Coating on 316L Steel Surface[J]. Chinese Journal of Materials Research, 2024, 38(11): 801-810.

全文: PDF(12150 KB) HTML

摘要:

用粉末包埋法在316L不锈钢样品和钢管内表面制备Fe-Al涂层，使用扫描电镜(SEM)、能谱分析(EDS)和X射线衍射仪(XRD)等手段表征其组织形貌、成分分布和物相组成并比较316L不锈钢平面涂层和管内壁涂层生长的差异，研究了渗铝剂配比、渗铝温度和渗铝时间对其组织结构和物相成分的影响。结果表明，在700~800℃保温渗铝6 h、Fe-Al粉质量分数为75%的涂层其生长效率最高，制备出的涂层均匀平整，致密性良好。在此温度区间，渗铝温度对涂层的物相组成影响不大。这种Fe-Al涂层具有双层结构，外层富铝层主要由FeAl韧性相组成，内层元素扩散层由Fe₃Al相组成。随着渗铝时间的增加元素扩散增强，使涂层表面的致密性提高并在富Al层与扩散层界面区域出现尺寸约1~2 μm的孔洞。渗铝时间越长，孔洞数量越多。在700~800℃渗铝，在316L不锈钢管内壁制备的Fe-Al涂层与316L不锈钢基体界面结合紧密且没有孔洞。在曲面上涂层晶核的体积比在平面上的涂层小，在曲面上形核的几率高、形核更快。在渗铝工艺参数相同的条件下，在不锈钢管内壁生长的涂层厚度约为在不锈钢平面生长的涂层厚度的1.1~2.1倍。

关键词 ：材料表面与界面, Fe-Al涂层, 粉末包埋法, 316L钢, 形核效能, 管内壁涂层

Abstract：

The Fe-Al coatings were prepared on the surface of 316L stainless steel plate and the inner surface of 316L tubes by pack cementation method. The effect of aluminizing agent ratio, temperature and time on the microstructure and phase composition of the Fe-Al coatings were investigated by Scanning electron microscopy (SEM), energy spectrum analysis (EDS) and X-ray diffractometer (XRD). The growth rate of coatings was measured for the planar samples and the inner wall of the tubes. The results showed that uniform Fe-Al coatings with good coherence to the substrate were obtained after aluminizing at 700~800^oC for 6 h. The higher growth rate of coating was achieved in the aluminizing agent with Fe-Al powder content of 75%. The aluminizing temperature has little effect on the phase compositions of the coatings obtained in the range of 700~800^oC. The prepared Fe-Al coating show double-layered structure, with the outer Al-rich layer mainly composed of FeAl toughness phase, and the inner elemental diffusion layer mainly composed of Fe₃Al phase. With the increasing time, the element diffusion is enhanced in the coating, which leads to dense and smooth coating surface. On the other hand, due to the enhanced element diffusion, some pores with 1-2μm diameter appears in the region near the interface between Al-rich layer and diffusion layer and the number of pores is increasing with time. The Fe-Al coating without pores at the interface of the 316L substrate was prepared on inner surface of 316L stainless steel tubes in the temperature range of 700~800^oC. After the same aluminizing process, the thickness of the coating grown on the inner tube surface is about 1.1~2.1 times of that on the plate surface. It can be explained by the smaller nuclei volume of coating nucleated on a curved surface than that on a flat surface, which result in the higher nucleation efficiency and faster growth rate of coating on the inner surface of tubes.

Key words： surface and interface in the materials Fe-Al coating pack cementation method 316L steel nucleation efficiency pipe wall coating

收稿日期: 2023-12-04

ZTFLH:

O484

基金资助:中核集团领创科研项目

通讯作者: 王永利，副研究员，wangyongli@imr.ac.cn，研究方向为核燃料包壳涂层

Corresponding author: WANG Yongli, Tel: 15909820506, E-mail: wangyongli@imr.ac.cn

作者简介: 陈继弘，男，1997年生，硕士

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表1 316L不锈钢基材的化学成分(质量分数，%)

表2 三种渗铝剂配比组成(质量分数，%)

图1 不同渗铝剂配比的Fe-Al涂层的表面和截面形貌

图2 不同渗铝剂配比的Fe-Al涂层的XRD谱

图3 不同深度的能谱选取点

表3 谱1和谱2的EDS结果

图4 在不同温度渗铝的Fe-Al涂层的表面形貌

图5 在不同温度渗铝6 h的Fe-Al涂层的截面形貌BSE图片和能谱分析

图6 不同温度渗铝Fe-Al涂层的XRD谱

表4 不同温度的Al原子扩散系数(D)

图7 渗铝不同时间Fe-Al涂层的表面形貌

图8 在800℃渗铝不同时间Fe-Al涂层的截面形貌的BSE图片和能谱分析

图9 不同渗铝时间Fe-Al涂层的XRD谱

图10 在不同温度渗铝不同时间316L管内壁的Fe-Al涂层的截面形貌的BSE图片

图11 316L不锈钢平面试样和管试样Fe-Al涂层的厚度与温度和时间的拟合

图12 在不同形状的固体杂质表面形核的晶核体积

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