A series of sliding‐rolling friction and wear experiments of a GCr15 steel ball against GCr15 steel plate under lubricated conditions were performed on NGY‐6 nano‐film thickness measuring instru‐ment .The effects of contact stress ,speed of steel ball and sliding‐rolling ratio on the friction coefficient and morphologies were investigated .The results showed that the friction coefficient increased with the increas‐ing of sliding‐rolling ratio ,and then reached a steady state at a fixed contact stress and speed of steel ball . As the sliding‐rolling ratio was fixed ,the friction coefficient increased gradually with the increasing of con‐tact stress .On the condition that the ball speed was lower than 300 r/min ,the friction coefficient decreased with the increasing of steel ball speed .When the steel ball speed and contact stress were over 300 r/min and 0 .84 GPa respectively ,the friction coefficient increased as the ball speed increased .Stribeck curve indi‐cated that the contact between the steel ball and plate was in hydrodynam lubrication regimes when the sliding‐rolling ratio was 0 .01 ;the lubrication condition transferred from boundary lubrication to mixed lu‐brication with the increasing of sommerfield parameter under the sliding‐rolling ratio of 0 .03 ;when the sliding‐rolling ratio were 0 .05 ,0 .1 ,0 .3 and 0 .5 respectively ,the contact was in conditions of boundary lu‐brication .As sliding‐rolling ratio was low ,the wear mechanism was mainly fatigue wear ,and with the slid‐ing‐rolling ratio increasing ,the wear mechanism changed to abrasive wear .%选用GCr15钢盘和GCr15球作为摩擦副，在NGY‐6纳米润滑膜测量仪上开展球‐盘点接触摩擦副在润滑状态下的滑滚摩擦磨损实验，研究不同接触应力、钢球转速、滑滚比等参数对摩擦副的摩擦因数、磨损形貌的影响规律．结果表明：当接触应力和钢球转速一定时，摩擦因数随着滑滚比的增大而逐渐增加后达到稳定状态；当滑滚比一定时，摩擦因数随接触应力的增大而逐渐增大；当钢球转速低于300 r／min时，摩擦因数随着钢球转速的增大而减小；当钢球转速高于300 r／min、接触应力大于0．84 GPa时，摩擦因数随着钢球转速的增大而呈增大趋势．Stribeck曲线表明：当滑滚比为0．01时，摩擦副处于流体动压润滑状态；当滑滚比为0．03时，润滑状态随Sommerfield参数的增加而从边界润滑过渡到混合润滑；当滑滚比分别为0．05、0．1、0．3、0．5时，润滑状态为边界润滑．滑滚比较小时，磨损机制以疲劳磨损为主，随着滑滚比的增大，磨损机制转变为磨粒磨损．
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