Figure 2 SEM micrographs of worn seat insert surface of engine #6175 after 1474 hours of testing. The arrows and labels indicate the locations of EDX analysis. The same adhesion phenomenon occurs on the valve seat surfaces. Figure 4 show... Figure 2 SEM micrographs of worn seat insert surface of engine #6175 after 1474 hours of testing. The arrows and labels indicate the locations of EDX analysis.
The same adhesion phenomenon occurs on the valve seat surfaces. Figure 4 shows SEM micrographs of the worn exhaust valve seat surface of engine #6175 after 1474 hours of testing. The valve material is Stellite 6 faced 23-8N (solution treated and aged). The arrows in Figure 4b indicate the locations of EDX analysis. Note the pits and deposits on the worn seat surface. Figures 5a shows the EDX spectrum of spot A on Figure 4b showing adhered insert material. Note molybdenum and manganese in the spectrum. Figure 5b shows the EDX spectrum of spot B in Figure 4b showing both adhered insert material and oil deposits. Note molybdenum.， phosphorous， chlorine， calcium， and zinc in the spectrum. Other valves from different engines labeled as "adhesion" in Table 2 share this typical adhesive phenomenon.
The adhesive wear mode appears to predominate at valve seat interfaces with high asperity contact stresses or high combustion pressure. The surface roughness can contribute to adhesion significantly. Valves faced with Stellite alloy show less adhesive wear than unfaced valves， Table 2. The presence of high melting point phases， such as carbide or ceramic compounds in the contacting materials is believed to help prevent microwelding or adhesion related wear.
Shear strain， also known as radial flow， is defined as the first derivative of the displacement， i.e.， . Figure 6 [8]. Shear strain controlled wear can characterized as a surface plastic deformation process. The wear is the result of the shear strain on the seat surface exceeding the plasticity limit of the material. The material is then detached or delaminated from the seating surface as wear particles. The typical appearance of shear strain controlled wear are ridges and/or radial flow of material on valve seats and inserts. Shear strain controlled wear sometimes is associated with adhesion.
图2扫描电镜照片阀座磨损表面引擎＃ 6175后一四七四小时测试。 The arrows and labels indicate the locations of EDX analysis.箭头和标签说明的位置， X射线能谱分析。
The same adhesion phenomenon occurs on the valve seat surfaces.同样的粘附现象，对阀座表面。 Figure 4 shows SEM micrographs of the worn exhaust valve seat surface of engine #6175 after 1474 hours of testing.图4显示形貌磨损排气阀座表面引擎＃ 6175后一四七四小时测试。 The valve material is Stellite 6 faced 23-8N (solution treated and aged).阀门材料Stellite 6面临23 - 8N （固溶处理和年龄） 。 The arrows in Figure 4b indicate the locations of EDX analysis.箭头图4B条显示的位置， X射线能谱分析。 Note the pits and deposits on the worn seat surface.请注意坑和存款的座位表面的磨损。 Figures 5a shows the EDX spectrum of spot A on Figure 4b showing adhered insert material.图5a显示能谱谱识别图4B条显示坚持插入材料。 Note molybdenum and manganese in the spectrum.注意：钼和锰的频谱。 Figure 5b shows the EDX spectrum of spot B in Figure 4b showing both adhered insert material and oil deposits.图5B条显示能谱谱现货B的图4B条既坚持插入材料和石油矿藏。 Note molybdenum.， phosphorous， chlorine， calcium， and zinc in the spectrum.注意：钼。 ，磷，氯，钙，锌的频谱。 Other valves from different engines labeled as "adhesion" in Table 2 share this typical adhesive phenomenon.其他阀门从不同的引擎标示为“粘连”的表2分享这一典型胶粘剂现象。
The adhesive wear mode appears to predominate at valve seat interfaces with high asperity contact stresses or high combustion pressure.在粘着磨损为主模式似乎在阀座接口微凸体接触应力高或高燃烧压力。 The surface roughness can contribute to adhesion significantly.表面粗糙度可有助于粘附显着。 Valves faced with Stellite alloy show less adhesive wear than unfaced valves， Table 2.阀门面临Stellite合金显示较少粘着磨损比unfaced阀，表2 。 The presence of high melting point phases， such as carbide or ceramic compounds in the contacting materials is believed to help prevent microwelding or adhesion related wear.在场的高熔点阶段，如硬质合金或陶瓷化合物在接触材料被认为有助于防止microwelding或粘附相关磨损。
Shear strain， also known as radial flow， is defined as the first derivative of the displacement， ie， .剪应变，也称为径向流，被界定为一阶导数的位移，即。 Figure 6 [8].图6 [ 8 ] 。 Shear strain controlled wear can characterized as a surface plastic deformation process.剪应变控制的磨损可以定性为表面塑性变形过程。 The wear is the result of the shear strain on the seat surface exceeding the plasticity limit of the material.磨损是由于剪应变的座椅表面超过限额的塑性材料。 The material is then detached or delaminated from the seating surface as wear particles.材料是那么超脱或脱层从座椅表面磨损颗粒。 The typical appearance of shear strain controlled wear are ridges and/or radial flow of material on valve seats and inserts.典型的外观剪应变磨损是脊控制和/或径向流动的材料阀座和刀片。 Shear strain controlled wear sometimes is associated with adhesion.剪应变控制磨损有时与粘连。
评论
wuq0424 
长按识别二维码查看信息详情