WTC2005-63590 THE STUDY ON ABRASIVE WEAR OF CARBON OF HIGH VANADIUM HIGH SPEED STEEL COMPARED WITH THAT OF HIGH CHROMIUN CAST IRON

ABSTRACT It is studied the carbons abrasive wear property of high vanadium high speed steel compared with that of general high chromium cast iron (Cr20) in this paper. The vanadium content is 10% in the high vanadium high speed steel, and it is a kind of new wear material that has been studied in the past ten years. In the experiment the three materials were used to resist the abrasive wear of Al 2 O 3 , the wear test was conducted on a ML-10 abrasive wear-testing machine. The abrasive surfaces, cross-section and sloping -section surfaces were scanned by means of a SEM (JSM-5160LV) device. The typical morphology photos of VC and Cr 7 C 3 were taken in course of abrasive wear, which not only describe the different abrasive wear property of the carbons in the two materials, but also make the cause of the excellent wear property of this HSS clear. The research results have showed that the service lives (V10) are three times longer than that of high chromium cast iron (Cr20). The excellent wear resistance of high vanadium high-speed steel depends on the characters of high hardness, lumpy morphology of VC which are scattered in hard matrix of HSS. INTRODUCTION High vanadium high speed steel is a kind of new wear material that has been studied in the past ten years. Japan has firstly used this steel for steel rollers successfully, whose service lives are twice to four times as long as those of high chromium cast iron (Keun et al, 1998. He et al, 1996.Fu et al, 1999.Liu et al, 1999. Henan Engineering Research Center for Wear of Material has studied and exploited a new kind of High vanadium high speed steel by absorbing worldwide research results and making some innovations on this HSS' chemical elements. The HSS has been successfully used into crush industry (Wei et al, 2002). The essay concentrates on the study on abrasive wear of carbon of High vanadium high speed steel compared with that of high chromium cast iron, which enlarge the application area of High vanadium high speed steel materials, provide some basic datum for research. It is important that some typical morphology photos of VC and Cr7C3 were taken in course of abrasive wear besides these morphology photos can not only describe the different abrasive wear property of the three materials, but also make the cause of the excellent wear of this HSS clear. METHODS In the wear test, the specimens with the size of 4×4×5mm were conducted on a ML-10 abrasive wear-testing machine, using alumina sand paper. The test distance was 20×72mm with pressure of 250N. In the experiment there were three specimens in a group, the average wear amount of three specimens represented this material wear property. The mass of wear is measured by an analysis-balance whose degree of discrimination is 0.1mg. The relative wear property is specified by ¦Å . ¦Å =M0/M, where M0 expresses the wear lost in the standard specimens, and M expresses the wear lost of each tested specimen. In the experiment, the specimen made of steel with high chromium iron was considered a standard one. RESULTS AND DISCUSSIO