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首页> 外文期刊>Applied Surface Science >The importance of carbon content beneath iron borides after boriding of chromium and nickel-based low-carbon steel
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The importance of carbon content beneath iron borides after boriding of chromium and nickel-based low-carbon steel

机译：硼化铬和镍基低碳钢后硼化铁中碳含量的重要性

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The complex (B + C) diffusion layers have been formed on chromium- and nickel-based low-carbon steels. Gas boriding applied to these steels that have been previously carburized enables the production of wear-resistant borocarburized layers. After combined surface hardening with boron and carbon in the microstructure two zones have been observed: iron borides (FeB + Fe2B) and carburized zones. The iron borides in borocarburized layer show the tendencies towards lose of the needle-like nature. The depth of iron borides zone depend on pre-carburizing parameters. Although borocarburizing causes reducing of the depth of iron borides zone, it also reduces the microhardness gradient across the case. An increase of distance from the surface is accompanied by a gradual decrease of carbon content and microhardness in carburized zone. Probably, the brittleness of borocarburized layer is lower. In the consequence, the frictional wear resistance of borocarburized layers is essentially higher than that obtained in case of only borided layers. There is every indication that the carbon content beneath iron borides has an important effect on wear resistance, too. The highest wear resistance of borocarburized layer has been observed in case of about 1.2% C below iron borides. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 15]
机译：复合物（B + C）扩散层已在铬和镍基低碳钢上形成。将气体渗硼应用于已预先渗碳的这些钢，可以生产耐磨的硼碳共渗层。在微观结构中用硼和碳对表面进行联合硬化后，观察到两个区域：硼化铁（FeB + Fe2B）和渗碳区域。硼碳共渗层中的硼化铁表现出倾向于失去针状性质的趋势。硼化铁区域的深度取决于预渗碳参数。尽管硼碳共渗会降低硼化铁区域的深度，但也会降低整个壳体的显微硬度梯度。与表面距离的增加伴随着渗碳区碳含量和显微硬度的逐渐降低。硼碳化层的脆性可能较低。结果，硼碳共渗层的摩擦耐磨性基本上高于仅硼化层的摩擦耐磨性。种种迹象表明，硼化铁下面的碳含量对耐磨性也有重要影响。在硼化铁以下约1.2％的情况下，观察到硼碳共渗层的最高耐磨性。 （C）2003 Elsevier Science B.V.保留所有权利。 [参考：15]

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