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crack defects

What are the effects of heat treatment on crack defects in high manganese steel?

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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 […]

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cast iron cross section

Color changes during visual inspection of cast iron cross section

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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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gray cast iron

How to reduce the shrinkage tendency of high-strength gray cast iron

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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

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local pitting defects

Causes and prevention of local pitting defects in ductile iron castings

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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

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martensitic wear-resistant ductile iron

Production process of martensitic wear-resistant ductile iron

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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,

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lost foam steel castings

Mechanism and prevention of surface carbonization of lost foam steel castings

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When using lost foam casting to produce steel castings, surface carbonization of castings has always been a controversial topic. When using EPS pattern materials, low carbon steel (such as ZG25) castings are prone to surface carbonization, but when using STMMA pattern materials, there is almost no surface carbonization on the surface of steel castings. For

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