Studying the microstructure, phase composition, and wear resistance of alloyed layers after laser surface melting of low-carbon steel 20

IF 0.8 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Metallurgist Pub Date : 2024-08-27 DOI:10.1007/s11015-024-01782-7

Antonina I. Karlina, Yulia I. Karlina, Vitaly A. Gladkikh

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Abstract

Laser surface alloying is a method used to modify a metal surface to produce a thin surface layer with improved mechanical properties. The results of tests on surface carburizing and boriding of steel 20 using a laser beam are presented. Before laser irradiation, the surface of the material was coated. Two types of coating were used: suspensions of graphite powder and boron carbide. Steel 20 was carburized and borided by melting the coating and the substrate. This processing produced various microstructures in the surface layer, depending on the type of coating used and the processing parameters. The microhardness of the alloyed layers was measured along the depth axis. The surface layer consists of an alloying zone and a heat-affected zone. Some specimens carburized by surface alloying displayed cracking and porosity due to carbon enrichment and high solidification rates. The laser-borated surface has a remelting zone consisting of an eutectic mixture of iron borides FeB, Fe₂B, and Fe₃B. The dense boride zone located near the surface, while the content of the eutectic mixture of borides and martensite increased toward the base metal. The microhardness of the borated layer was 1200 HV. The alloy layers were tested for abrasive wear.

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研究低碳钢激光表面熔化后合金层的微观结构、相组成和耐磨性 20

激光表面合金化是一种对金属表面进行改性的方法，它能在金属表面形成一层薄薄的表层，从而提高机械性能。本文介绍了使用激光束对 20 号钢进行表面渗碳和硼化处理的试验结果。在激光照射前，材料表面进行了涂层处理。使用了两种涂层：石墨粉悬浮液和碳化硼。通过熔化涂层和基体，对 20 号钢进行渗碳和碳化硼处理。根据所使用涂层的类型和加工参数的不同，这一加工过程在表层产生了不同的微观结构。沿深度轴测量了合金层的显微硬度。表层由合金区和热影响区组成。一些通过表面合金化渗碳的试样因碳富集和凝固速率过高而出现裂纹和气孔。激光硼化表面的重熔区由铁硼化物 FeB、Fe2B 和 Fe3B 的共晶混合物组成。致密硼化物区位于表面附近，而硼化物和马氏体共晶混合物的含量则向基体金属方向增加。硼化层的显微硬度为 1200 HV。对合金层进行了磨料磨损测试。

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来源期刊

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).