By E. R. Braithwaite

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The "work hardening" can seriously impair the efficiency of a bearing surface, and for this reason the more severe operations of cutting and grinding should be followed by annealing to restore the uniformity of crystal size and relieve stress. The texture of the finished surface is, in terms of atomic dimensions, exceedingly rough and made up of rows of steep hills and valleys, each with smaller irregularities and lying roughly parallel to the direction of cutting (Fig. 6). A fresh bearing surface must not be subjected to full loads and sliding speeds until it has been "run-in" under light loads with copious supplies of lubricant.

Metals 3, 438, 1951. 38. PIGGOTT and WILMAN. Instn Mech. Engrs Conf. on Lubrication and Wear, Paper No. 18, 1957. 39. SCOTT and WILMAN. Proc. Roy. Soc. A 247, 353, 1958. 40. PORGESS and WILMAN. Proc. Roy. Soc. A252, 35, 1959. 41. BOAS and HONEYCOMBE. Proc. Roy. Soc. A 1 8 8 , 427, 1947. 42. WILSON and GRAHAM. Instn Mech. Engrs Conf. on Wear, Paper No. 83, October 1957. FRICTION, WEAR AND LUBRICATION 29 43. CAMBPELL. M. Spec. Tech. Pub. N o . 144. 44. UHLIG, FENG, TIERNEY and MCCLELLAN. A. Tech.

The liquid lubricants (hydrocarbons) successfully cope with type I and up to a point special polar liquids or hydrocarbon oils containing polar additives will cope with II, but in type III solid lubricants are predominant. The type III system has not been recognized in its own right but merely as an extension of type II. S. 26 SOLID LUBRICANTS AND SURFACES into it during the running-in process. The physico-chemical properties of a solid/metal interface are different from those of ata liquid/metal interface.

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