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首页> 外文期刊>Tribology Transactions >Optimization of Cryogenic Process for Enhancing the Wear Resistance of Novel HNMS Steel for Cryogenic Bearings of Launch Vehicle
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Optimization of Cryogenic Process for Enhancing the Wear Resistance of Novel HNMS Steel for Cryogenic Bearings of Launch Vehicle

机译：优化低温工艺，提高新型HNMS钢耐磨性耐磨车辆电气轴承

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Bearings are highly engineered components that have to tolerate vibratory stresses, bending moments, and high rotational speeds in cryogenic applications. AISI 440C is most widely used for antifriction bearings due to its good strength and high hardness but is prone to carbide banding and failure during service. High-nitrogen martensitic stainless steel (HNMS) was recently developed by partially substituting carbon with nitrogen. This article explores the possible improvement in wear properties by cryotreating HNMS steel. The hardening temperature was varied from 1050 to 1100 degrees C, cryosoaking period from 0 to 12 h at -196 degrees C, and tempering temperature from 100 to 300 degrees C for 1 h. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis revealed the presence of carbides and carbonitrides. The phase fraction and size of the precipitates was found to be influenced by the cryosoaking period. The carbide density variation with the cryosoaking period followed a sigmoidal curve. Eight hours of cryogenic treatment at -196 degrees C was observed to be the optimal cryosoaking period for HNMS steel. Maximum hardness (671 HV) and minimum wear rate (0.00714 mm(3)/m) and adhesive wear were observed for the optimum heat treatment condition. Compared to conventional hardening-tempering (HT) treatment, the optimized hardening-cryogenic-tempering (HCT) treatment cycle resulted in a 38% increase in hardness and a 31% decrease in the wear rate. The improved properties can be attributed to the presence of fine and uniform distribution of precipitates in the matrix and transformation of retained austenite to martensite.
机译：轴承是具有耐受振动应力，弯曲力矩和低旋转速度在低温应用中的高度工程化组件。由于其良好的强度和高硬度，AISI 440C最广泛地用于抗抗率轴承，但在服务期间容易易于有碳化物条带和故障。最近通过部分地用氮气替代碳而开发了高氮马氏体不锈钢（HNMS）。本文通过冷冻加速HNMS钢来探讨可能的改进。将淬火温度从1050至1100℃变化，低温为0至12小时，在-196℃下，回火温度从100至300℃下变化1小时。扫描电子显微镜（SEM）和X射线衍射（XRD）分析显示存在碳化物和碳氮化物。发现沉淀物的相位和尺寸受到冷冻蒸发期的影响。碳化物密度变化随着低温的时间伴随着六样曲线。观察到在-196摄氏度下的八小时的低温处理是HNMS钢的最佳低温。为最佳热处理条件观察到最大硬度（671HV）和最小磨损率（0.00714mm（3）/ m）和粘合剂磨损。与传统的硬化回火（HT）处理相比，优化的硬化冷冻淬火（HCT）处理循环导致硬度增加38％，磨损率降低31％。改善的性质可以归因于存在于基质中的沉淀物和保留奥氏体转化为马氏体的沉淀物分布的存在。

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