Abstract
Microstructure evolution of low alloy wear resistant steels during heat treatment procedure was studied in this paper. The results showed that During furnace cooling in homogenizing, Chromium/iron, Niobium, Vanadium and other hardly soluble carbides formed. But Chromium/iron carbides could resolve into austenite during quenching procedure, while the other carbides barely changed. Carbon addition grew the carbides into shuttle shapes and inflated the austenite grains. But Ni addition broadened the martensite lath width without dilating the austenite grains. And it hardly influenced the carbides formation. Vanadium addition seemed that the martensite lathes were cut into several discontinues sections. With the temperature rising, the boundaries got blurred, which might correlated with the decomposing of retained austenite.
Highlights
Wear resistance of steel have become increasingly prominent in engineering
Through EPMA images, it could be shown that Carbon and Chromium elements segregated in ferritepearlite boundaries and pearlite block, while vanadium exhibited no obvious segregation in this dimension
This indicated that during furnace cooling in homogenizing, Chromium/iron carbides composed, while few Vanadium atoms existed as carbides
Summary
Wear resistance of steel have become increasingly prominent in engineering. The alloy element content and heat treatment process, including temperature, isothermal holding time and cooling rate, played a significant role in improving the mechanical properties in wear resistance steels. Research in this area has attracted the attention of many researchers. Carbon had a critical effects on the microstructure and properties of low alloy wear resistant steels[1]. This work focued on effects of C, Ni and V on microstructure and properties of low alloy wear resistant steels. The hardness and impact toughness of low alloy wear resistance steels with different alloy composition were tested
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