Heat treatment method of iron-based wear-resistant coating plough shovel tip

A heat treatment method and wear-resistant coating technology, applied in heat treatment furnaces, heat treatment equipment, coatings, etc., can solve the problems of reduced performance, cracking of wear-resistant layers, low work efficiency, etc., to achieve low production costs and eliminate quenching stress. , to avoid the effect of quenching secondary cracking

Active Publication Date: 2019-12-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

If the plow shovel tip is coated with wear-resistant layer and subjected to conventional quenching treatment, the wear-resistant layer will crack and peel off; if the plow shovel tip is not quenched after being coated with wear-resistant layer, its performance will be seriously reduced, and Deformation, fast wear, low work efficiency and other problems

Method used

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  • Heat treatment method of iron-based wear-resistant coating plough shovel tip
  • Heat treatment method of iron-based wear-resistant coating plough shovel tip
  • Heat treatment method of iron-based wear-resistant coating plough shovel tip

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Experimental program
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Effect test

Embodiment 7

[0037] In Example 7, the matrix structure of the plow and shovel tip sample after quenching in a 300°C salt bath is martensite + upper bainite, and the impact toughness index is extremely low, which cannot meet the product use requirements;

[0038] Embodiments 4, 5, and 6 not only ensure the appearance quality of the plow and shovel tip sample, but also enable it to obtain higher strength and toughness.

[0039] The present invention has carried out a large number of tests to verify under different quenching and holding temperatures, times and quenching conditions, and the test results and rules are consistent with the above-mentioned embodiments.

[0040] Such as figure 1 As shown, the metallographic structure diagram of the iron-based wear-resistant layer sprayed and welded according to the test composition, it can be seen from the figure that the metallographic structure of the wear-resistant coating is composed of a martensite matrix and a uniformly distributed hard point...

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Abstract

The invention relates to the field of production and processing of agricultural implements, in particular to a heat treatment method of an iron-based wear-resistant coating plough shovel tip. According to the method, a boron steel material plough shovel tip is taken as a substrate, and the plough shovel tip substrate is coated with an iron-based wear-resistant layer by adopting a plasma spray welding technology; the plough shovel tip coated with the wear-resistant layer by plasma spray welding is heated to the temperature higher than austenitizing temperature in an induction heating mode, subjected to heat preservation for a certain time, quickly transferred into a salt bath for quenching, and placed in air for cooling after being quenched, and self tempering is achieved by utilizing material characteristics. By adopting the plough shovel tip produced by the method, quenching secondary cracking of the wear-resistant layer can be basically avoided, the production cost is low, and the batch stability is good. After the heat treatment, the hardness of the wear-resistant layer is more than 63HRC, the hardness of the matrix is more than 45HRC, the impact toughness (akv) of the matrix reaches 30J/cm<2>, and the product performance and service life are greatly higher than those of similar products in China.

Description

Technical field: [0001] The invention relates to the field of production and processing of agricultural machinery, in particular to a heat treatment method for plow and shovel tips with iron-based wear-resistant coating. Background technique: [0002] With the rapid development of agricultural technology and the continuous improvement of mechanization and automation, in the process of realizing agricultural modernization, agricultural machinery has received more and more attention from the state. Machine blades, etc. are the key components of agricultural machinery and an important process link to ensure the safe and excellent operation of agricultural machinery within the life cycle. The working conditions of the soil-touching working parts of agricultural machinery are harsh, the working conditions are complex, and they are easy to wear. The wear-resistant layer is required to have high hardness and toughness, and the substrate should have good strength and toughness. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/18C21D1/18C21D1/60C23C4/06C23C4/134
CPCC21D1/18C21D1/60C21D9/18C23C4/06C23C4/134
Inventor 杨志荣闫德胜戎利建吴宪吉胡小锋
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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