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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) >Statistical Analysis of Nonmetallic Inclusions for the Estimation of Rolling Contact Fatigue Range and Quality Control of Bearing Steel
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Statistical Analysis of Nonmetallic Inclusions for the Estimation of Rolling Contact Fatigue Range and Quality Control of Bearing Steel

机译：非金属夹杂物的统计分析估计滚动轴承疲劳范围和轴承钢的质量控制

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摘要

The cleanliness of bearing steels is a critical factor that influences directly the rolling contact fatigue performance and other mechanical properties of bearings. Hence, the evaluation of nonmetallic inclusions is a very important issue for steelmakers, bearing producers, and users. The material qualification procedure includes classical inclusion rating and rolling contact fatigue tests as acceptance tests for evaluating steel suppliers and ensuring the required bearing performance. The evolution of steel cleanliness had led to an increase in fatigue life so that running time of rolling contact fatigue tests have been considerably extended, until they became too time and cost consuming for a realistic qualification. In this paper, quantitative metallographic evaluation of the inclusion cleanliness used to collect data on the size, type, and expected number of inclusions in small samples is presented. The data were analyzed using Statistics of Extreme Values (SEV) and the results were used to extrapolate in larger samples representative of actual volumes of material involved in rolling contact fatigue tests and were related to the fatigue life of bearing steels from different suppliers. This method gives useful and reliable statistical data on inclusions for evaluating the performance level under rolling contact fatigue and defines the required cleanliness characteristics for bearing steels qualification. Other information of this work is the ability of the statistical inclusion rating to serve as a substitute for rolling contact fatigue tests to forecast the performance level of bearing steels.
机译：轴承钢的清洁度是直接影响轴承滚动接触疲劳性能和其他机械性能的关键因素。因此，对于钢铁制造商，轴承生产商和用户而言，非金属夹杂物的评估是一个非常重要的问题。材料鉴定程序包括经典的夹杂物评级和滚动接触疲劳测试，作为验收测试，以评估钢铁供应商并确保所需的轴承性能。钢清洁度的提高导致疲劳寿命的延长，因此滚动接触疲劳测试的运行时间已大大延长，直到它们变得太耗时且不符合实际认证的成本。在本文中，提出了对夹杂物清洁度的定量金相评估，用于收集小样本中夹杂物的大小，类型和预期数量。使用极值统计（SEV）对数据进行了分析，结果被用于外推更大的样本，这些样本代表了参与滚动接触疲劳测试的材料的实际体积，并且与不同供应商的轴承钢的疲劳寿命有关。该方法可提供有用和可靠的夹杂物统计数据，以评估滚动接触疲劳下的性能水平，并定义轴承钢鉴定所需的清洁度特性。这项工作的其他信息是统计夹杂物等级可以代替滚动接触疲劳试验来预测轴承钢的性能水平。

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