WC powder was injected onto the surface of Q235 steel by laser melt injection (LMI). The influence of process parameters was studied. The microstructure and composition of the coatings were analyzed by SEM, XRD and ED...WC powder was injected onto the surface of Q235 steel by laser melt injection (LMI). The influence of process parameters was studied. The microstructure and composition of the coatings were analyzed by SEM, XRD and EDS. The hardness and wear-resistant property of the coatings and Q235 steel were measured. The results show that LMI layer can be achieved only under the condition that process parameters meet the strict requirements. By optimizing the process parameter, excellent coatings can be acquired by injecting WC powder onto the surface of Q235 steel. The microstructure in the coatings is complex, which consists of WC, W2C and M6C(Fe3W3C-Fe4W2C) phases. The difference of Fe3W3C microstructure in different zones of the coatings is obvious. Both the compositions of the reaction layers around the particle and dendrite precipitation carbides in the upper coating are Fe3W3C. The average hardness of LMI layer is above HV 900, which is about four times that of Q235 steel. The friction coefficient of LMI layer is only one quarter that of the substrate, which indicates that the wear resistance of the coatings is enhanced sharply.展开更多
A new type of Ni-Fe-W-P-S wear-resistant brush plating layer isdeveloped, and its microstructure is investigated at different temperatures by usingX-ray diffractometer, transmission electron microscope and surface ana...A new type of Ni-Fe-W-P-S wear-resistant brush plating layer isdeveloped, and its microstructure is investigated at different temperatures by usingX-ray diffractometer, transmission electron microscope and surface analytical appa-ratus. The results revealed that the plating layer is composed of amorphous and mi-crocrystalline matrix and intermetallic compounds. Such a microstructure is verybeneficial to improving its wear-resistance.This new type of plating layer can replacethe chromium plating technique which is very poisonous for human health and harm-ful to the agricultural production.展开更多
The process of wear process expedient considering as set of special cases wear. For each special case wear were received settlement with reference to some certain conditions of experimental researches realisation, uni...The process of wear process expedient considering as set of special cases wear. For each special case wear were received settlement with reference to some certain conditions of experimental researches realisation, uniting in self SLOP. For successful application deduced dependence at forecasting wear-resistance the mechanism of reduction is developed which allows to distribute deduced dependencies to any conditions of wear process.展开更多
文摘WC powder was injected onto the surface of Q235 steel by laser melt injection (LMI). The influence of process parameters was studied. The microstructure and composition of the coatings were analyzed by SEM, XRD and EDS. The hardness and wear-resistant property of the coatings and Q235 steel were measured. The results show that LMI layer can be achieved only under the condition that process parameters meet the strict requirements. By optimizing the process parameter, excellent coatings can be acquired by injecting WC powder onto the surface of Q235 steel. The microstructure in the coatings is complex, which consists of WC, W2C and M6C(Fe3W3C-Fe4W2C) phases. The difference of Fe3W3C microstructure in different zones of the coatings is obvious. Both the compositions of the reaction layers around the particle and dendrite precipitation carbides in the upper coating are Fe3W3C. The average hardness of LMI layer is above HV 900, which is about four times that of Q235 steel. The friction coefficient of LMI layer is only one quarter that of the substrate, which indicates that the wear resistance of the coatings is enhanced sharply.
文摘A new type of Ni-Fe-W-P-S wear-resistant brush plating layer isdeveloped, and its microstructure is investigated at different temperatures by usingX-ray diffractometer, transmission electron microscope and surface analytical appa-ratus. The results revealed that the plating layer is composed of amorphous and mi-crocrystalline matrix and intermetallic compounds. Such a microstructure is verybeneficial to improving its wear-resistance.This new type of plating layer can replacethe chromium plating technique which is very poisonous for human health and harm-ful to the agricultural production.
文摘The process of wear process expedient considering as set of special cases wear. For each special case wear were received settlement with reference to some certain conditions of experimental researches realisation, uniting in self SLOP. For successful application deduced dependence at forecasting wear-resistance the mechanism of reduction is developed which allows to distribute deduced dependencies to any conditions of wear process.
