CAJ | 학술논문

摘要：采用钢球冲击45号钢盘，观测了在不同接触条件、冲击次数及载荷条件下钢盘表面的塑性变形情况．发现在低冲击次数条件下，使用低黏度油的凹坑深度与干接触相近，但在高次数冲击条件下，冲击深度与干接触条件下相比大幅度变浅．而高黏度油条件下的凹坑深度一直最浅．在其他条件相同时，冲击深度随载荷的增加而增加．冲击时，由于凹坑中心产生的热量不断向边缘传递，使凹坑边缘形成凸起即形成所谓彩虹环．彩虹环随润滑油黏度的增加及载荷的增加而高度增加．润滑油的使用可以降低材料表面的塑性变形和磨损．对于干接触条件，凹坑内部发生微细颗粒碎化．而油润滑时凹坑内部出现微裂纹．微细颗粒碎化及微裂纹的程度均随冲击次数和载荷的增加而增加．
적요：채용강구충격45호강반，관측료재불동접촉조건、충격차수급재하조건하강반표면적소성변형정황．발현재저충격차수조건하，사용저점도유적요갱심도여간접촉상근，단재고차수충격조건하，충격심도여간접촉조건하상비대폭도변천．이고점도유조건하적요갱심도일직최천．재기타조건상동시，충격심도수재하적증가이증가．충격시，유우요갱중심산생적열량불단향변연전체，사요갱변연형성철기즉형성소위채홍배．채홍배수윤활유점도적증가급재하적증가이고도증가．윤활유적사용가이강저재료표면적소성변형화마손．대우간접촉조건，요갱내부발생미세과립쇄화．이유윤활시요갱내부출현미렬문．미세과립쇄화급미렬문적정도균수충격차수화재하적증가이증가．
Abstract.In the experiment, we use a steel ball to impact the plate of no. 45 steel. The plas- tic deformation of the dent is observed under different contact conditions, impacting times and loads. Through the observation, we found that at low impact times, the depth of the dent by using the low viscosity oil is close to that while impacting under dry contact condi- tion, but at high impact times, the depth of the dent by using the low viscosity oil is obvi- ously shallower than that while impacting under dry contact condition. And the depth of the dent by using the high viscosity oil is always the shallowest. When the other conditions are the same, the depth of the dent increases with the loads. While impacting, the heat produced from the center of the dent transmits to the edge continuously, which causes the edge of the dent form the convex, we call it the iridescent ring. The height of the iridescent ring increa- ses with the increase of the viscosity of the oil and the load. The use of the lubricating oil can reduce the plastic deformation and the wear of the materials. Under the dry contact condi- tion, superfine particles are found inside the dent. Microcracks occur inside the lubricated dent. The fragmentation of the superfine particles and the degree of the microcracks increasewith the impacting times and loads.