Telephone: +86 13313251709
Email: wxjx@vip.163.com
Address: Shanliguzhuang Industrial Park, Tongpaizhuang Township, Zunhua City, Hebei Province
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Casting is a relatively economical method for forming blanks. It is particularly advantageous for parts with complex shapes. For instance, the cylinder blocks and cylinder heads of automotive engines, ship propellers, and exquisite artworks. Some parts that are difficult to machine, such as nickel-based alloy parts of steam turbines, cannot be formed by casting methods.
For casting engineers and mechanical structure design engineers, heat treatment is a very meaningful and highly valuable method for improving the quality of materials. Mechanical weighting can change or influence the structure and properties of cast iron through heat treatment, and at the same time, higher strength, hardness, and improved wear resistance can be achieved.
Due to different purposes, there are numerous types of heat treatment. Generally, they can be mainly divided into two categories. The first type is those whose microstructure will not change or should not change after heat treatment. The second type is those whose basic microstructure changes. The heat treatment process is mainly used to eliminate internal stress, which is caused during the casting process due to different cooling conditions and circumstances. The microstructure, strength and other mechanical properties do not undergo significant changes after heat treatment.
For the second type of heat treatment, significant changes have occurred in the base organization, which can be broadly classified into five categories:
(1) Softening annealing: Its main purpose is to decompose carbides, reducing their hardness and improving processing performance. For ductile iron, the aim is to obtain a greater amount of ferrite structure.
(2) Normalizing treatment: The main purpose is to obtain pearlite and sorbite structures, thereby enhancing the mechanical properties of the castings.
(3) Quenching: This process is mainly carried out to achieve higher hardness or wear resistance, and to obtain extremely high surface wear resistance.
(4) Surface hardening treatment: The main purpose is to obtain a surface hardening layer while achieving extremely high surface wear resistance.
(5) Decalcification and hardening treatment: This process is mainly aimed at achieving high strength without causing significant changes in elongation.
(6) Handling of surface casting defects: Sometimes our defects are not numerous, so it is unnecessary to invest a large amount of cost. We can simply repair them with some adhesives. It is convenient and simple. For example, for iron materials, we can make some repairs. The unused parts can be saved for future use. This can help our factory save costs.
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+86 133-1325-1709
Email: wxjx@vip.163.com
Address: Shanligezhuang Industrial Park,
Tuanpiaozhuang Township, Zunhua City,
Hebei Province
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