Study On Wear Resistance At High Temperature And Red Hardness Of H13Stell After RE-N-C-S-V-Nb Multi-Elemments Penetrating

AISI H13steel because of his several good performances is widely used for aluminum extrusion dies. But the high temperature, high pressure and heavily stress during the pressing of Aluminum extrusion will lead to AISI H13steel out of work from steel surface due to wear and creep. So, enhance the surface performances is the key to prolong the service life. Compound surface treatment and modification is one of the effective ways of surface strengthening for material.This paper, which is study the properties of high temperature wear resistance and red hardness of AISI H13which employed SEM, EDS and micro-hardness measurement is base on previous studies.The high temperature wear property of compound deposition sample is tested at500℃, and used the substrate sample and carburization sample as the reference samples at the same tested condition. The results show that the high temperature friction coefficient of three groups of samples is almost the same, and all appear oxidative wear during the high temperature wear test. During this tested condition the high temperature wear rate of compound deposition sample is2.96X10-13m3/N·m, about1/4of the carburization sample and1/7of the substrate sample. During the high temperature wear test, the worn form of the compound deposition sample is mostly oxidation wear and adhesive wear. While the carburization sample is oxidation wear and abrasive wear. And substrate sample is oxidation wear and severe abrasive wear. After tests, microcrack appeared on the surface of the substrate sample and the body has been some deformation. And the surface of the carburization sample has been spalling due to the delamination wear. Compound deposition sample still maintain a good surface integrity.During the red hardness study, the compound deposition sample show it’s best red hardness during the tests which testing temperature was set at560℃and600℃separately and still maintain1334HV0.1after560℃test. The carburization sample show worse red hardness test result while the substrate sample is the worst. After the640℃×4h test, the deposition layer of all the samples have been oxidation peeling. It found that the soaking time, the emerge of element enrichment layer and the oxidation peeling off of the compound layer will have combined influence to the grain size. Nitrocementation processing can substantially enhance the deposition layer red hardness for increase the thickness of the layer and reduce the alloy elements enrichment. While the Mutual solution of niobium, vanadium carbonitride has a high red hardness value than single niobium carbonitride or vanadium carbonitride. Between lanthanon for partial gathered in the grain boundary, a similar needle effect and block of grain boundary migration. The grain refinement effect of lanthanon can effectively improve the performance of red hardness.