Effect of hardness differential on metal-to-metal fretting damage
Effect of hardness differential on metal-to-metal fretting damage
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DOI：
10.1016/j.wear.2013.01.003
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发表时间：
2013-04-01
期刊：
影响因子：
5
通讯作者：
Budinski, Kenneth G.
中科院分区：
文献类型：
--
作者：
Budinski, Kenneth G.
在标准化的实验室微动试验的发展过程中，观察到从锻造棒料中取出的奥氏体不锈钢样品的微动损伤与冷精整带材形式的相同合金的损伤显著不同。这些意想不到的结果表明，配对成员之间的硬度差异可能会在微动运动下如何损坏一对夫妇发挥重要作用。从损坏的角度来看，接触构件之间的硬度差是否优于相同硬度下的配合构件？新开发的ASTM G 204标准微动试验被用来解决这个问题。该测试使用在平面上的往复运动的球，振幅为50 μ m，法向力为10 N，并且在13 Hz下持续一百万次摩擦循环。一个硬化钢滚珠轴承（52100钢在670 HV）与01型工具钢在不同的硬度（690 HV至280 HV）和相对微动损伤进行了评估。在空气和轻质矿物油中进行了测试。该油在所有硬度差下都显著降低了系统损坏。此外，损伤从微动腐蚀到微动磨损。在空气和油中，与硬/硬耦合相比，硬/软耦合产生的系统损坏显著增加。空气和油试验都表明，一个构件的硬度稍微降低（10%）可能会减少约10%的损坏，但好处是微不足道的。在矿物油中进行的试验表明，粘着磨损是两个构件损坏的主要机制。粘着磨损似乎是点蚀的起源，通常是典型的微动接触。(C)2013爱思唯尔有限公司版权所有。
During the development of a standardized laboratory fretting test it was observed that the fretting damage to austenitic stainless steel samples taken from wrought bar stock was significantly different from damage to the same alloy in cold-finished strip form. These unexpected results suggested that hardness differences between the mating members might play a significant role in how a couple damages under fretting motion. Is a hardness differential between contacting members better from the damage standpoint than mating members at the same hardness?The newly developed ASTM G 204 standard fretting test was used to address this question. This test uses a reciprocating ball on a flat with amplitude of 50 mu m, normal force of 10 N, and duration of one million rubbing cycles at 13 Hz. A hardened steel ball rider (52100 steel at 670 HV) was mated with type 01 tool steel at different hardnesses (690 HV to 280 HV) and the relative fretting damage was assessed. Tests were conducted in air and in light mineral oil.The oil significantly reduced system damage at all hardness differentials. In addition, the damage went from fretting corrosion to fretting wear. In both air and oil a hard/soft couple produced a significant increase in system damage compared to a hard/hard couple. Both air and oil tests suggested that a slightly reduced hardness (10%) of one member may reduce damage by about 10%, but the benefit was marginal. The test conducted in mineral oil demonstrated that adhesive wear is the prevailing mechanism for damage to both members. Adhesive wear appeared to be the origin of the pitting that is often typical in fretting contacts. (C) 2013 Elsevier B.V. All rights reserved.