J Fail. Anal. and Preven. (2012)12: 427-437 with dimples were present on the fracture surface, which surface, which is also depicted in Fig. 2d. This shows represents a typical morphology of quasi-dissociation actually the distinct evidence of the fracture origin, and fracture. Furthermore, traces of mutual friction and will be concretely explained as follows ueeze can be also found on the fracture surface. as shown in Fig 4b, c, respectively. These two phenomena Contact Surface on the Outer ring may have resulted from the contact between the two counterfaces of the outer ring after fracture. It should be The contact surface between the outer ring and the roller particularly noted from Fig 4d that actinomorphous also was then analyzed under SEM and EDS. Figure 5a fringes have originated from the corner of the fracture displays neat machining fringes on the fresh surface of the (a) (d) 2.003.04.00s,006,0D7.00n,09, 1..。2.。03.004.00s0G.DO7.B.0分.o Fig 5 SEM morphologies and EDS of the contact surface on the outer ring:(a) normal morphology, (b) lar trenches, (c)concave, (d adhered substances (e) eDs of site nd (f eds of site B Springwith dimples were present on the fracture surface, which represents a typical morphology of quasi-dissociation fracture. Furthermore, traces of mutual friction and squeeze can be also found on the fracture surface, as shown in Fig. 4b, c, respectively. These two phenomena may have resulted from the contact between the two counterfaces of the outer ring after fracture. It should be particularly noted from Fig. 4d that actinomorphous fringes have originated from the corner of the fracture surface, which is also depicted in Fig. 2d. This shows actually the distinct evidence of the fracture origin, and will be concretely explained as follows. Contact Surface on the Outer ring The contact surface between the outer ring and the roller also was then analyzed under SEM and EDS. Figure 5a displays neat machining fringes on the fresh surface of the Fig. 5 SEM morphologies and EDS of the contact surface on the outer ring: (a) normal morphology, (b) irregular trenches, (c) concave, (d) adhered substances (e) EDS of site A, and (f) EDS of site B J Fail. Anal. and Preven. (2012) 12:427–437 431 123