A new category of steel with excellent combi- nation of strength,toughness,strain-hardening ability and excellent resistance to high-stress,espec- ially to severe impact-loaded abrasion has been de- veloped with a new...A new category of steel with excellent combi- nation of strength,toughness,strain-hardening ability and excellent resistance to high-stress,espec- ially to severe impact-loaded abrasion has been de- veloped with a new idea of abrasion-resistant ma- terial design.The steels have the microstructures of austenite film and bainitic ferrite laths in arrange- ment of extremely fine lath spacing and are chemically high-carbon low alloy ones.The effects of austempering temperatures on microstructures, mechanical properties,wear-resistance and behaviour of the austenite-bainite steels in impact-abrasion system have been emphatically studied.展开更多
A new wear-resistant austenite-bainite medium Mn steel with nodular carbide can be obtained by modifying with La compound. The result shows that the equiaxed crystals are refined, and their quantity is increased after...A new wear-resistant austenite-bainite medium Mn steel with nodular carbide can be obtained by modifying with La compound. The result shows that the equiaxed crystals are refined, and their quantity is increased after the treatment. The nodular carbide in fact is eutectic of austenite and (Fe . Mn)3 C is formed during solidification between austenitic dendrites. When the eutectic grows, the small melting pools between equiaxed crystals limit it's growing. Lanthanum species, are absorbed on eutectic growth interface, controlling eutectic growing.展开更多
By vermicularizing agent containing RE (REFeSi), austempered vermicular graphite cast iron (AVGCI) with RE can be produced with austempered treatment. The process of austenitization of vermicular graphite cast iron (V...By vermicularizing agent containing RE (REFeSi), austempered vermicular graphite cast iron (AVGCI) with RE can be produced with austempered treatment. The process of austenitization of vermicular graphite cast iron (VGCI) with RE and the transformation of AVGCI with RE with temperature increasing were studied by SEM with heating device. Properties of AVGCI with RE, such as tensile strength, elongation, impact toughness, hardness, thermal fatigue resistance, thermal expansive coefficient and weight increasing by oxidation were measured by electron universal testing machine with heating device. Experimental results indicate that AVGCI with RE possesses good comprehensive properties at room and elevated temperatures.展开更多
文摘A new category of steel with excellent combi- nation of strength,toughness,strain-hardening ability and excellent resistance to high-stress,espec- ially to severe impact-loaded abrasion has been de- veloped with a new idea of abrasion-resistant ma- terial design.The steels have the microstructures of austenite film and bainitic ferrite laths in arrange- ment of extremely fine lath spacing and are chemically high-carbon low alloy ones.The effects of austempering temperatures on microstructures, mechanical properties,wear-resistance and behaviour of the austenite-bainite steels in impact-abrasion system have been emphatically studied.
文摘A new wear-resistant austenite-bainite medium Mn steel with nodular carbide can be obtained by modifying with La compound. The result shows that the equiaxed crystals are refined, and their quantity is increased after the treatment. The nodular carbide in fact is eutectic of austenite and (Fe . Mn)3 C is formed during solidification between austenitic dendrites. When the eutectic grows, the small melting pools between equiaxed crystals limit it's growing. Lanthanum species, are absorbed on eutectic growth interface, controlling eutectic growing.
文摘By vermicularizing agent containing RE (REFeSi), austempered vermicular graphite cast iron (AVGCI) with RE can be produced with austempered treatment. The process of austenitization of vermicular graphite cast iron (VGCI) with RE and the transformation of AVGCI with RE with temperature increasing were studied by SEM with heating device. Properties of AVGCI with RE, such as tensile strength, elongation, impact toughness, hardness, thermal fatigue resistance, thermal expansive coefficient and weight increasing by oxidation were measured by electron universal testing machine with heating device. Experimental results indicate that AVGCI with RE possesses good comprehensive properties at room and elevated temperatures.
