Improvement of Wear and Corrosion Resistance of Austenitic Stainless Steel by Combined Treatment Using Electron Beam Cladding and Subsequent Gas Nitrocarburizing
Improvement of Wear and Corrosion Resistance of Austenitic Stainless Steel by Combined Treatment Using Electron Beam Cladding and Subsequent Gas Nitrocarburizing
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电子束熔覆与后续气体氮碳共渗联合处理提高奥氏体不锈钢的耐磨性和耐腐蚀性
DOI：
10.1002/adem.201900365
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发表时间：
2019
影响因子：
3.6
通讯作者：
Hegelmann
中科院分区：
文献类型：
--
作者：
Hegelmann
奥氏体不锈钢的高钝化能力使其在各种腐蚀介质中具有优异的耐腐蚀性。然而，由于这些钢的低硬度和高敏感性粘着磨损，其摩擦学性能不足。为了改善奥氏体钢的磨损性能，同时保持耐腐蚀性，可以使用热化学工艺，如氮化或氮碳共渗。这些过程可以作为单一程序或与涂层技术结合进行。本文介绍了一种新的组合处理方法，即Co基合金的电子束包覆（EBC）和随后的气体氮碳共渗（GNC）。研究了束偏转工艺对包覆磨损保护层微观组织、相形成、硬度、稀释率及与基体结合的影响。随后的气体氮渗处理可形成≈10 μm‐厚的富含氮和碳的表面层。磨料和粘接磨料磨损试验表明，与未经处理的基材相比，耐磨性有了显著改善。通过记录电流密度-电位曲线和在腐蚀性介质中的长期试验来研究耐蚀性。
The high passivation capacity of austenitic stainless steels results in excellent corrosion resistance in a wide variety of corrosion media. However, the tribological properties of these steels are insufficient due to their low hardness and high susceptibility to adhesive wear. To improve the wear behavior of austenitic steels while maintaining corrosion resistance, thermochemical processes such as nitriding or nitrocarburizing can be used. Such processes can be carried out as single procedures or in combination with coating techniques. Herein, the results of a new combination treatment consisting of the electron beam cladding (EBC) of a Co‐based alloy with subsequent gas nitrocarburizing (GNC) are presented. The effects of the beam deflection technique on the microstructure and phase formation of the cladded wear protection layer, the resulting hardness as well as the dilution ratio and the bonding of this layer to the base material are demonstrated. The subsequent gas nitrocaburizing leads to the formation of an ≈10 μm‐thick surface layer enriched with nitrogen and carbon. The significant improvement in wear resistance compared with the untreated base material is demonstrated by abrasive and adhesive‐abrasive wear tests. Corrosion resistance is investigated by recording current density—potential curves and long‐term tests in corrosive media.
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