Short-process semi-solid cast wear-resistant ball and manufacturing method thereof

Abstract

The invention relates to a short-process semi-solid bainite ductile cast iron grinding ball and a preparation method thereof. The short-process semi-solid bainite ductile cast iron grinding ball is characterized by comprising the following chemical components in percentage by mass: 3.3 percent to 3.7 percent of C, 2.2 percent to 2.6 percent of Si, 0.4 percent to 0.7 percent of Mn, 0.03 percent to 0.045 percent of RE, 0.004 percent to 0.055 percent of Mg, 0.015 percent to 0.018 percent of B, 0.5 percent to 0.7 percent of Cu, more than or equal to 0.1 percent of P, more than or equal to 0.04 percent of S, and the balance of Fe and unavoidable impurities. The preparation method of the short-process semi-solid bainite ductile cast iron grinding ball comprises the following steps: carrying out vacuum melting; carrying out primary inoculation by utilizing an inoculator and a nodulizer; pouring molten iron into a metal mold; simultaneously carrying out secondary inoculation; preparing semi-solid slurry in the metal mold by adopting an electromagnetic stirring technology; then cooling and opening the mold; and placing a casting in molten mixed bases to carry out isothermal quenching. According to the invention, the preparation process flow is short; energy consumption is low; the product has stable performance and uniform hardness; the integral volume hardness of the short-process semi-solid bainite ductile cast iron grinding ball reaches HRC58; the surface hardness of the short-process semi-solid bainite ductile cast iron grinding ball reaches HRC60 to 61; the center hardness of the short-process semi-solid bainite ductile cast iron grinding ball reaches HRC54 to 57; the internal and external hardness difference of the grinding ball with specification of 110mm is less than HRC6; impact energy alpha k is more than 15J / cm<2>; and falling ball tests show that falling ball impact fatigue life of the short-process semi-solid bainite ductile cast iron grinding ball exceeds 10,000 times.

Description

Technical field [0001] The invention belongs to the technical field of metal materials and their preparation, and particularly relates to a short-flow semi-solid cast wear-resistant ball and a manufacturing method thereof. Background technique [0002] The metal grinding ball is a relatively simple spherical product, and it is an indispensable and important part of mining, building materials, coal, chemical and other industrial sectors. Therefore, as a consumable product, wear-resistant steel balls have a huge annual market demand. The annual demand for international grinding balls is more than 5 million tons, and the demand for Chinese grinding balls is more than 1 million tons, especially for large-scale mines. [0003] According to the requirements of different equipment and different working conditions in various industries, there are various materials and production processes for manufacturing grinding balls, such as forged steel balls, ductile iron, and chromium alloy castin...

AI Technical Summary

Problems solved by technology

At present, the advantages of the semi-solid forming process in terms of mold filling performance and product quality have been fully reflected. It has been industrialized in developed countries such as Europe and the United States, and is now widely used to improve the mechanical properties of light metals such as aluminum and magnesium. Found application on ductile iron

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