Development of wear resistant medium carbon dual phase steels and their mechanical properties

Abstract

Dual phase (DP) steels containing four different amounts of martensite ranging from 42 to 72 vol.-% have been developed from 0 . 42 wt-% carbon normalised steel by intercritical heat treatment at a xed temperature of 740°C but varying holding times followed by water quenching. Mechanical properties of dual phase steels with increasing volume fraction of martensite have been investigated highlighting the effect of martensite content. The macrohardness has been found to increase with increasing martensite content in dual phase steel. The yield and tensile strengths have been found to increase with increasing amount of martensite whereas the percentage elongation and the percentage area reduction have been found to decrease. This has been attributed to the presence of hard and brittle martensite phase, which increases the strength at the expense of ductility. The mode of fracture has been found to change from purely ductile to mixed (ductilezbrittle) as the martensite volume fraction increases from 42 to 72% in dual phase steels. Friction and wear properties under dry sliding conditions have also been found to improve with increasing martensite volume fraction in dual phase steels. The applications of medium carbon DP steels in the eld of mineral processing and mining have been discussed.MST/5974

Effect of Pre-intercritical Annealing Treatments on the Microstructure and Mechanical Properties of 0.33% Carbon Dual-Phase Steel

“…However, medium or higher carbon dual-phase steels have recently gained importance due to improved strength and wear resistance. Medium-carbon dual-phase steels can be used for applications in mineral and mining processes which do not require any welding operation ( Ref 17,18). Nowadays, dual-phase steels are also used as wear resistance materials if proper combination of strength and ductility is obtained ( Ref 7,19,20).…”

An investigation of the wear behaviour of 0.2% C dual phase steels

“…In a recent study they have also been found to hold good potential for use as farm implements where strength and wear resistant become of a great concern . The tribology of dual phase steels has not yet been explored extensively, and only a few studies have been reported (Tyagi et al, 2001(Tyagi et al, , 2004Jha et al, 2003;Modi, 2007;Modi et al, 2003;Basak et al, 1998). Modi (2007) has shown that the abrasion resistance of dual phase steel is greatly Tehran, Iran.…”

“…They have recently emerged as a potential engineering material system for automobile and other engineering application (Davies and Magee, 1979). Low carbon dual phase steels have found application in making pipe-lines for transportation of mineral slurry and other wear resistant applications (Tyagi et al, 2004). In a recent study they have also been found to hold good potential for use as farm implements where strength and wear resistant become of a great concern .…”

Estudo Termodinâmico De Inclusões Nãometálicas Na Produção De Aços Dual-Phase Com Alto Teor De Silício

“…Estes aços foram desenvolvidos na década de 70 pela indústria automotiva com o objetivo de obter um material que aliasse elevada resistência, boa soldabilidade, conformabilidade e ductilidade, permitindo a redução de peso dos veículos sem comprometer a segurança [1]. Devido a estas propriedades os aços DP também foram estudados para outras aplicações, tal como vergalhão para concreto armado [2][3][4] e tubulações para transporte de minérios [5,6]. A composição química destes aços varia consideravelmente de acordo com as propriedades desejadas, mas seus principais componentes são C (tipicamente < 0,2%), Mn e Si, podendo ser adicionadas pequenas quantidades de Cr, Mo, V, Nb ou B [1].…”