Abstract
The aim of this study is to find an alternative quenching medium for the ordinary nitrate mixture that is cheaper and more available in Iraqi markets. So to obtain the suitable medium , the effect of different quenching mediums used in martempering treatment on the microstructure and mechanical properties of high chromium white cast iron was studied . This type of cast iron is used in mining ,crushing and cement plants as mill liners so it is subjected to extreme conditions of wear and impact that eventually cause failure . In this study, two types of quenching mediums were used in martempering treatment: (50% Sodium hydroxide + 50 % potassium hydroxide) mixture and (50% Sodium nitrate + 50 % potassium nitrate) mixture with different quenching intervals. It is also found that both of the quenching mediums produce higher hardness values at 350°C martempering temperature for 4 hr quenching time ,but there were several advantages and disadvantages associated with using these two different mediums.
Highlights
High chromium white cast irons represent a class of materials commonly used for materials handling, crushing and grinding applications in the minerals and mining industries due to their excellent wear resistance [1,2]
High chromium white cast irons microstructures are comprised of eutectic carbides and a metallic matrix comprised of secondary chromium carbides, martensite, austenite and in some cases ferrite
The reference [4] studied the influence of variables such as holding temperatures and times during aus tempering of High Chromium White Cast Iron (HCWCI)
Summary
High chromium white cast irons represent a class of materials commonly used for materials handling, crushing and grinding applications in the minerals and mining industries due to their excellent wear resistance [1,2]. The reference [5] studied the effects of soft annealing and hardening and tempering on the hardness and microstructure of high chromium cast iron Their results showed that a proper selection of parameters of heat treatment could control the hardness and composition of phase microstructure of chromium cast iron. The results revealed marked improvements in mechanical properties and wear performance by adding carbide forming elements .on the other hand, the Destabilization heat treatment employed to obtain the martensitic structure for improving the toughness and abrasion resistance of these irons. The reference [7] studied the effects of heat-treatment on microstructure and mechanical properties of high chromium white cast iron alloyed with titanium. The current study aims to find cheaper and more available quenching medium than the ordinary nitrate mixture and compare its effect on microstructure and mechanical properties
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