Abstract
Hybrid cylindrical roller thrust bearing washers of type 81212 were manufactured by tailored forming. An AISI 1022M base material, featuring a sufficient strength for structural loads, was cladded with the bearing steel AISI 52100 by plasma transferred arc welding (PTA). Though AISI 52100 is generally regarded as non-weldable, it could be applied as a cladding material by adjusting PTA parameters. The cladded parts were investigated after each individual process step and subsequently tested under rolling contact load. Welding defects that could not be completely eliminated by the subsequent hot forming were characterized by means of scanning acoustic microscopy and micrographs. Below the surface, pores with a typical size of ten µm were found to a depth of about 0.45 mm. In the material transition zone and between individual weld seams, larger voids were observed. Grinding of the surface after heat treatment caused compressive residual stresses near the surface with a relatively small depth. Fatigue tests were carried out on an FE8 test rig. Eighty-two percent of the calculated rating life for conventional bearings was achieved. A high failure slope of the Weibull regression was determined. A relationship between the weld defects and the fatigue behavior is likely.
Highlights
Hybrid cylindrical roller thrust bearing washers of type 81212 were manufactured by tailored forming
Industrially produced bearing washers have a lower tendency to plastic. These results indicate that the additional forming and heat treatment steps reduced the tendency to plastic deformation of the bearing cladding material theindividual bearing washer deformation than the hybrid washer, so of that processmade stepsby in the tailored forming chain.should
Using plasma-transferred arc welding, classical bearing steel AISI 52100 was cladded on AISI 1022M basic steel and subsequently formed by upsetting
Summary
Hybrid cylindrical roller thrust bearing washers of type 81212 were manufactured by tailored forming. An AISI 1022M base material, featuring a sufficient strength for structural loads, was cladded with the bearing steel AISI 52100 by plasma transferred arc welding (PTA). Introduction higher load than basic structural regions. This occurs, for example, due to rolling contacts, like rolling. The material at and just below the surface, such as the raceway of the bearing, higher load than basic structural regions. This occurs, for example, due to rolling contacts, like rolling canbearings experience very The highmaterial stressesatofand over. Just below theand surface, such the raceway oforder the bearing, can a long lifetime, the material needs to be of a high quality, strength, and hardness
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