Development of High Manganese Steel Insert Cast Carbide Hammer

Development of High Manganese Steel Cast Carbide Hammer Head Chen Hexing Zhao Yong. Chang Ming, Zhang Fenghua Institute of Wear Resistant Materials, Guangzhou Nonferrous Metals Research Institute, Guangzhou 510650, Guangdong, China Observe the interface and hardness test; Test shows that the interface of the two kinds of materials is metallurgical; the service life of the hammerhead is 3 Times.

Hammer crusher hammers are mostly made of high manganese steel, and high manganese steel is a kind of antiwear material with a long history of use. In recent years, domestic and foreign scientific and technological workers have improved their wear resistance in order to improve their performance. High-manganese steel has been studied in many aspects. Literature 1 studies the alloying of high-manganese steels and points out that the addition of elements such as rivers can increase the content of them, 1. or 殪 0 can be increased by 1 and the wear resistance can be improved. To this view, literature 1 studies the improvement of the wear resistance of tannins by changing the manganese-to-carbon ratio of high-geng steel and also the use of pre-cure hardening. 5 and improve the smelting casting and heat can be used to improve the performance of high-hard steel. These scholars' researches have achieved certain results in improving the wear resistance of high-manganese steels14. However, for some large impacts and larger work conditions, such as the use of high-manganese steel for hammers of medium and large hammer crushers, + enough to roll, for example, with a hammer made of mountain, life is usually only 7 days. Therefore, this paper discusses the casting of high-manganese steel casting cemented carbide. Heat treatment of materials, combination of cast-in-place interfaces, and results of field use. In order to increase the service life 1 Experimental method Cemented carbide uses high manganese steel matrix composition Hard phase selection is called 1. Cemented carbide test block shape and size. Before casting.

Carefully polish the hard alloy face with an emery cloth, weld one nail and one end of the nail to the sand mold, and fix the cemented carbide test block in the center of the cavity.

Carbide matrix 1.2 Hadamang 1.1 specimens were heat-treated in a box resistance furnace using water, treated at a heating temperature of 1050 = interfacial bonding conditions were observed first with the naked eye, and then optical microscope and electron probe models were used. Analyze the distribution of tissue structures and elements near the interface.

2 Experimental results and discussion After the machined specimen surface was observed by naked eye, it was found that the specimen obtained by the above method was different in the appearance of the high manganese steel and the hard alloy except that the color of the high hard steel was white. She can be alloyed in black outside. Bin does not have any gaps. Explain that the two villages are well-grounded and tested. The hardness of hard intercalation before casting is: After the 596 and high-manganese steel are cast and hardened, the hardness of the specimen surface is tested. The hardness of the middle region of the cemented carbide is basically maintained at 060, but with High manganese steel combined near the area. Hardness decreased to 58. And 1 in the high manganese steel side near the hard alloy area of ​​the hardness of 3060 is also much higher than the hard alloy high manganese steel hardness 2224, indicating that in the high manganese steel and cemented carbide joint material Hardness occurs with a transition between two material hardnesses. This is the result of high tough steel and cemented carbide penetration.

In order to better inspect the bonding condition of the two kinds of material interfaces, the metallographic specimen 2 was cut at the cast joint, and after polishing, the microstructure near the bonded interface was analyzed with an electron probe. 3 Given the 51 photos at the junction, it can be seen that the cemented carbide matrix is ​​well bonded with Shangmao Steel, and no joints can be seen. That is to say, the Shangmao Steel and the Hard Gold Corps Hall are closed. In the manganese steel side, a region where 1 particle is sparsely distributed can be seen, that is, under the hard phase in the cemented carbide, partly drifting from the hard alloy side to the high-hard steel side. This is due to the ingot casting process. The high-manganese molten steel melts the hard alloy surface so that these 1 particles are randomly fixed in the high-manganese steel.

The service life of the material.

3 The use of performance at the site, but also in the hammer crusher easy to wear surface cast a number of column-shaped hard gold-containing cast before the first hard cloth polished, in each carbide 1 end welding a nail , The other end of the nail is inserted into the sand type. Thus, the cemented carbide is fixed in the cavity. After rapping, the hard alloy was cast on a hammer made of high-tempered steel medium alloy method. The hammerhead was used in the Shunde Fortune Field in Guangdong Province. The broken material was used as a hard heart for highways. 20, but the original use of high-manganese steel hammer life is only 7 inlaid cast hammer head and the cost of high and fierce steel hammer only increased by 30, significantly cast insert hammer good economic and social benefits 4 Conclusion For better The description of the combination of the two types of cast-in-place interfaces indicates that the surface of one element of the field of view has been distributed at the junction, and the surface distribution of one element of the five river images and the same field of view has been given. It can be seen from Fig. 4 that on the cemented carbide side, there is a feature enriched with 1 element, a ray image, and on the side of the high manganese steel close to the interface area there is also a feature of 1 element, a ray image, indicating 1 element on the 1 side of the high manganese steel. Existence is due to the metallurgical bonding of the two materials during the cast-in process and the drift of the ten-direction high-hard steel side in the hard alloy. During the heat treatment, the element 1 in the D1 diffuses and the manganese steel diffuses. From this it can be seen that Dingkou granules and high manganese steel are very firmly combined.

The experimental results show that the cemented carbide and high manganese steel inserts are metallurgically bonded. The transition between the hardness of the two kinds of materials and the distribution of the structure and elements of the material has resulted in a transition zone, which makes the cemented carbide very firmly cast in the steel of Gaoyue. The combination of manganese steel, hard alloy and high manganese steel is used for metallurgical bonding. The former's matrix and the latter melted into the body; no interface was visible; the former's hard phase 1 partially drifted to the latter's side; and the hard phase's D1's were also partially expanded to the island's forged steel, 2 Casting her neodymium alloy boring head art is simple, easy, and handy.

(3) Casting, the life expectancy of the ramming steel hammer steel is about 3 times that of the high manganese steel hammer, and the cost only increases by 30.

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