High temperature alloys are a class of cutting-edge materials with high corrosion resistance, high temperature resistance and high temperature strength. According to the metal components contained in the alloy, high-temperature alloys can be divided into iron-based alloys and nickel-based alloys. Iron-based superalloys can be divided into pearlitic, martensitic and austenitic types according to their normalized structures. The matrix structure of nickel-based high-temperature alloys is austenite. In addition, there are cobalt-based alloys, chromium-based alloys and copper-based alloys.
During the forging process of high-temperature alloys, the grain size depends on the degree of forging deformation. The critical deformation degree of high-temperature alloys has a wide range, generally between 0.5% and 20%. In order to avoid cracking, the deformation degree cannot be lower than the critical deformation degree each time. Forging high-temperature alloys requires attention to the following process principles: blanking, heating and forging.
When blanking, blanks smaller than 25mm can be blanked by shearing, and blanks larger than 25mm can be blanked by grinding wheel cutting or mechanical processing. Since grinding wheel cutting will produce thermal stress and easily lead to cracks, it should not be used in large quantities. Heating is very important for high-temperature alloys and needs to be performed according to the heating specifications and forging temperatures of the specific alloy.
During the forging process, whether it is lengthening or upsetting, some process characteristics and requirements need to be paid attention to. When drawing out, it is necessary to use upper and lower V-shaped anvils to draw out. For high-temperature alloys with low plasticity, upper and lower semi-arc anvils can be used to draw out to improve the stress state of the material and reduce the occurrence of cracks. When upsetting, paper pads coated with glass lubricant can be used at both ends of the upsetting blank. For forgings with larger D/H, stack forging can be used, and carbon steel can be used as soft pads to improve plasticity.
After forging is completed, proper cooling is required. Under normal circumstances, you can refer to the cooling method of free forging forgings. For nickel-based alloys, air cooling is often used to prevent hot cracking. But sometimes rapid cooling is required to prevent precipitation of the hardened alloy. If it is found that residual stress will cause cooling cracking during the forging process, it can be heated to a temperature that can eliminate the stress and then cooled.
In short, the forging process of high-temperature alloys requires attention to the characteristics and process requirements of the alloy to ensure the quality and performance of the forgings. When forging high-temperature alloys, the blanking method, heating conditions and forging methods need to be reasonably selected based on the characteristics and process requirements of the specific alloy. At the same time, attention should be paid to controlling the degree of deformation to avoid the occurrence of cracking, and appropriate measures should be taken to improve the plasticity and deformation uniformity of the material.
In short, the forging of high-temperature alloys is a complex and critical process that requires reasonable selection of materials, control of process parameters, and compliance with strict process requirements. As a professional high-temperature alloy manufacturer, ANTON METAL Company will continue to be committed to providing high-quality alloy materials and providing customers with a full range of technical support and services. If you have any questions or needs about high temperature alloy forging, please feel free to contact us and we will be happy to serve you.
Tianjin Anton Metal Manufacture Co., Ltd. is a company specializing in the production of various nickel-based alloys, Hastelloy alloys and high-temperature alloy materials. The company was established in 1989 with a registered capital of 10.0 million, specializing in the production and sales of alloy materials. Anton Metal’s products are widely used in aerospace, chemical industry, electric power, automobile, nuclear energy and other fields, and can also provide customized alloy material solutions according to customer needs. If you need to know the price consultation of alloy materials or provide customized alloy material solutions, please feel free to contact the sales staff.
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Post time: Nov-25-2023
