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首页> 外文会议>STP 1465; Symposium on Bearing Steel Technology-Advances and State of the Art in Bearing Steel Quality Assurance; 20050517-19; Reno,NV(US) >Characteristics of Vanadium Alloyed Carbonitrided Steel for Rolling Bearing Applications
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Characteristics of Vanadium Alloyed Carbonitrided Steel for Rolling Bearing Applications

机译：滚动轴承用钒合金碳氮共渗钢的特性

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摘要

Today, most bearings for automotive transmission operate in an environment of severe debris contaminated lubrication. Thus, to develop the bearings that have a long life under the lubrication environment, micro-alloyed forging steel with a vanadium element based on medium-carbon steel and a carboni-triding heat-treatment process have been developed. Initially, the variation of grain size caused by an amount of aluminum and nitrogen was investigated. The hot deformation behavior was evaluated by means of a Gleeble tester. In general, it is extremely difficult to obtain sufficient nitrogen in the case-hardened layer by a conventional carbonitriding process. However, the application of the newly developed steel has not only the increment of nitrogen content in the case-hardened layer, but also the additional benefit that heat treatment costs could be cut effectively. In addition, we have investigated the retained austenite and precipitation behavior of V(CN), and the evaluated rolling contact fatigue life of a heat-treated specimen. As a result, we identified that the fatigue life of developed steel samples, under contaminated lubrication environment, is about five times better than comparative steel. The micro-structural degradation mechanism during fatigue testing was elucidated.
机译：如今，大多数用于汽车变速器的轴承都在严重的碎屑污染的润滑环境下运行。因此，为了开发在润滑环境下具有长寿命的轴承，已经开发了基于中碳钢的具有钒元素的微合金锻造钢和碳共渗热处理工艺。最初，研究了由铝和氮的量引起的晶粒尺寸的变化。借助于Gleeble测试仪评估热变形行为。通常，通过常规的碳氮共渗工艺很难在表面硬化层中获得足够的氮。但是，新开发的钢的应用不仅增加了表面硬化层中氮的含量，而且还具有可以有效降低热处理成本的额外好处。此外，我们还研究了残留的奥氏体和V（CN）的析出行为，并评估了热处理试样的滚动接触疲劳寿命。结果，我们确定，在受污染的润滑环境下，开发的钢样品的疲劳寿命大约是对比钢的五倍。阐明了疲劳测试过程中的微观结构降解机理。

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