CAJ | 학술논문

针对AM60B合金在环境温度25～200℃、载荷12.5～300 N的条件下进行干摩擦磨损实验.结果表明:随着载荷的增大,磨损率增加;从轻微磨损到严重磨损的转变的临界载荷分别为25℃时275 N,100℃时150N,200℃时75 N.在低载荷(＜50 N)下,200℃下的磨损率低于25℃和100℃的.在轻微磨损阶段,磨损机制为磨粒磨损、氧化磨损和剥层磨损.当轻微磨损到严重磨损的转变开始时,剥层磨损发挥主要作用,剥层磨损是从基体内部发生的剥落.随后,塑性挤出磨损作为严重磨损出现,同时伴随着从轻微磨损到严重磨损的转变.厚的、硬的摩擦层通过限制磨面的塑性变形来阻碍从轻微磨损到严重磨损的转变.
침대AM60B합금재배경온도25～200℃、재하12.5～300 N적조건하진행간마찰마손실험.결과표명:수착재하적증대,마손솔증가;종경미마손도엄중마손적전변적림계재하분별위25℃시275 N,100℃시150N,200℃시75 N.재저재하(＜50 N)하,200℃하적마손솔저우25℃화100℃적.재경미마손계단,마손궤제위마립마손、양화마손화박층마손.당경미마손도엄중마손적전변개시시,박층마손발휘주요작용,박층마손시종기체내부발생적박락.수후,소성제출마손작위엄중마손출현,동시반수착종경미마손도엄중마손적전변.후적、경적마찰층통과한제마면적소성변형래조애종경미마손도엄중마손적전변.
Dry wear tests under atmospheric conditions at 25-200 ℃ and loads of 12.5-300 N were performed for AM60B alloy.The wear rate increases with increasing the load; the mild-to-severe wear transitions occur under the loads of 275 N at 25 ℃,150 N at 100 ℃ and 75 N at 200 ℃,respectively.However,as the load is less than 50 N,the wear rate at 200 ℃ is lower than that at 25 ℃ or 100 ℃.In mild wear regimes,the wear mechanisms can be classified into abrasive wear,oxidation wear and delamination wear.Delamination wear prevailed as the mild-to-severe wear transition starts to occur; the delamination occurs from the inside of matrix.Subsequently,plastic-extrusion wear as severe wear prevails accompanied with the transition.The thick and hard tribo-layer postpones the mild-to-severe wear transition due to restricting the occurrence of massive plastic deformation of worn surfaces.