Structure of coatings produced on steel by Ni-Al based alloys after thermal cycling

IF 0.8 4区 材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING
S. N. Khimukhin, K. P. Eremina
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引用次数: 0

Abstract

Coatings obtained by electro-spark deposition method using anode alloys based on NiAl and Ni3Al were shown to increase heat resistance of steel grades St30 (AISI 1030) (up to 10 times) and 20Kh13 (AISI 420) (up to 4 times) under the thermal cycling conditions. The structure of anode alloys and coatings after thermal cycling at a maximal temperature of 900 °C was studied. By analyzing the surface structure of the coated samples, it was established that oxides with high Fe content (> 36 at. %) were mainly formed along the edges of the samples, while the sample faces exhibited microcrack formation. Some of the microcrack surfaces were found to contain oxide coatings with higher Fe content (> 56 at. %). By analyzing the cross-sectional structure of the coated samples, it was shown that coatings are made up of the following two layers: the bottom layer, which is located at the cathode interface and exhibits high Fe content (~ 80 at. %), and the top layer. The composition of the top layer is close to that of the anode alloy, and after thermal cycling, it develops transverse microcracks. It was found that the bottom layer of the coating acts as a barrier, which prevents the microcrack propagation to the cathode surface. In those places where the bottom layer is discontinuous, microcracks from the top layer reach the surface of the cathode, which causes the formation of oxides with high Fe content on their surfaces.

Abstract Image

Abstract Image

热循环后镍铝基合金在钢上形成的涂层结构
在热循环条件下,使用基于 NiAl 和 Ni3Al 的阳极合金通过电火花沉积法获得的涂层可提高 St30(AISI 1030)和 20Kh13(AISI 420)钢种的耐热性(最高可达 10 倍)。在最高温度为 900 °C 的热循环条件下,研究了阳极合金和涂层的结构。通过分析涂层样品的表面结构,发现高铁含量(36%)的氧化物主要沿着样品边缘形成,而样品表面则形成了微裂纹。发现一些微裂纹表面含有铁含量较高的氧化物涂层(56%)。通过分析涂层样品的横截面结构,可以看出涂层由以下两层组成:底层(位于阴极界面,铁含量较高(约 80%))和顶层。顶层的成分与阳极合金的成分接近,在热循环后会出现横向微裂纹。研究发现,涂层的底层起到了屏障的作用,阻止了微裂纹向阴极表面的扩展。在底层不连续的地方,来自顶层的微裂纹会到达阴极表面,从而在其表面形成高铁含量的氧化物。
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来源期刊
Metallurgist
Metallurgist 工程技术-冶金工程
CiteScore
1.50
自引率
44.40%
发文量
151
审稿时长
4-8 weeks
期刊介绍: Metallurgist is the leading Russian journal in metallurgy. Publication started in 1956. Basic topics covered include: State of the art and development of enterprises in ferrous and nonferrous metallurgy and mining; Metallurgy of ferrous, nonferrous, rare, and precious metals; Metallurgical equipment; Automation and control; Protection of labor; Protection of the environment; Resources and energy saving; Quality and certification; History of metallurgy; Inventions (patents).
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