Post-testing measurement of freely movable and diffusible hydrogen in context of WEC formation at cylindrical roller thrust bearings from 100Cr6  

作　　者：Martin LINZMAYER Francisco GUTIÉRREZ GUZMÁN Gregor MANKE Georg JACOBS Christopher SOUS Michael POHL 

机构地区：[1]Institute for Machine Elements and System Engineering,RWTH Aachen University,Schinkelstrasse 10,Aachen 52062,Germany [2]Institute for Materials,Material Testing,Ruhr University Bochum,Universitatsstr 150,Bochum 44801,Germany

出　　处：《Friction》2021年第4期876-890,共15页摩擦（英文版）

基　　金：The authors would like to thank the ResearchAssociation for Drive Technology (FVA) for thefunding and support from the research work throughthe research project FVA 707 IV

摘　　要：Sub-surface crack networks in areas of altered microstructure are a common cause for bearing failures.Due to its appearance under light microscopy,the damage pattern is referred to as White Etching Cracks(WEC).The root causes leading to the formation of WEC are still under debate.Nevertheless,it has already been shown that atomic hydrogen can have an accelerating effect on the formation and propagation of WEC.In addition to hydrogen pre-charging,hydrogen can be released and absorbed during rolling/sliding due to the decomposing of the lubricant and water.The current work focuses on the analysis of the hydrogen content of cylindrical roller thrust bearings after testing in a FE8 type test rig using two different lubricants.Within the framework of this work,two different hydrogen analysis methods were used and assessed regarding their applicability.The results show that the so-called Hydrogen Collecting Analysis(HCA)is more suitable to investigate the correlation between lubricant chemistry and hydrogen content in the test bearings than the Local Hydrogen Analysis(LHA).The measurements with the HCA show a continuously increasing freely movable and diffusible hydrogen content under tribological conditions,which leads to the formation of WEC.Comparative tests with an oil without hydrogen showed that the tendency of the system to fail as a result of WEC can be reduced by using a lubricant without hydride compounds.

关 键 词：White Etching Crack(WEC) White Etching Areas(WEA) hydrogen content Hydrogen Collecting Analysis(HCA) freely movable hydrogen diffusible hydrogen cylindrical roller thrust bearing roller bearings roller contact fatigue 

分 类 号：TH133.3[机械工程—机械制造及自动化] TH117.2