rnOTOMICROGRAVIIY AS'D Tf-CllXlCtl. MlCliOSCOPy 141 



Fij;. J. (a) Fatilly |.ack hanUnin;.' cf car ulucls idr lull ticket dislrilnitini: 

 system. The olijcct of pack liardcning is to impart a highly carhiiri/cd 

 wearing surface to the otherwise soft steel part. The interior remains 

 soft and ductile. Lack of uniformity in hardening or insuflicient depth 

 of the carburizcd zone causes soft spots which result in unequal wear. 

 The magnification is 11.2 X. 



