1. The influence of melting molten iron in electric furnace on material properties 1.1 Influence on “spontaneous nucleation” The melting point of scrap steel is higher than that of cast iron, and the melting point of carburizer is even higher. When scrap steel is melted and melted, the carburizer is heated and slowly dissolved and […]
Technology of melting ductile iron with cast scrap steel and carburizer Leer más »
1. Effect of quenching process Quenching temperature: If the quenching temperature is too high, the austenite grains of high manganese steel will grow, resulting in reduced toughness of the material. During the cooling process, due to the combined effect of tissue stress and thermal stress, the casting is prone to cracks. For example, when the
What are the effects of heat treatment on crack defects in high manganese steel? Leer más »
1. Visual color changes of gray cast iron ferrite, pearlite, and cementite fracture When gray cast iron is directly visually inspected without a microscope, the color differences of ferrite, pearlite, and cementite are as follows: Ferrite: A smooth cross section appears light gray, metallic, uniform, and pure, with no obvious patterns or special structures. Pearlite:
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High strength and shrinkage have always been a contradiction. The production of high-strength castings has a large shrinkage tendency. To solve the shrinkage problem of materials, the general principle is to have a higher carbon-silicon equivalent. The process of high carbon-silicon equivalent plus alloying has a smaller shrinkage tendency than the process of low carbon-silicon
How to reduce the shrinkage tendency of high-strength gray cast iron Leer más »
1 Morphological characteristics of defects Local pitting defects in ductile iron castings generally appear at the concave corners of the upper surface of the casting , and are composed of many pits. The shape of the pits is circular or irregularly polygonal, and its diameter is mostly between 1 and 3 mm. As can be
Causes and prevention of local pitting defects in ductile iron castings Leer más »
1. Metallographic structure of martensitic wear-resistant ductile iron Martensite Martensite is the main matrix structure, generally high-carbon hidden needle martensite. Under the metallographic microscope, it is in the form of needles or laths, with fine and interlaced layers. Due to the supersaturated solid solution of carbon in α-Fe, it has high hardness and high strength,
Production process of martensitic wear-resistant ductile iron Leer más »
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