4J33 alloy bar 4J33 material standard
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4J33 alloy, also known as Invar alloy, has a low coefficient of expansion and is an ideal elastic element material, which is widely used in aerospace, precision machinery and other fields. However, the strength and hardness of the invar alloy are high, and the machinability is poor, so it is necessary to select the appropriate tools and processing parameters in the machining process to improve the processing efficiency and reduce the cost.
In this article, we will introduce the material standard of 4J33 alloy bar, and study its machinability through experiments. Through the research in this paper, we can better understand the performance characteristics of 4J33 alloy bars and provide guidance for actual production.
1. Material standard of 4J33 alloy bar.
The material standard of 4J33 alloy bar is GB T 14992-2005 "Classification and Grade of Superalloys", which is a kind of precision alloy. The standard stipulates the chemical composition, mechanical properties, process properties and other indicators of 4J33 alloy bar. Among them, the chemical composition is detected in accordance with YB T 5245-1993 "Chemical Analysis Methods for Superalloys", including C, SI, MN, P, S, CR, MO, TI and other elements. Mechanical properties include tensile strength, yield strength, elongation, section shrinkage and other indicators, which are an important basis for evaluating material properties. The process performance mainly includes heat treatment system, molding performance and welding performance.
2. Research on the cutting performance of 4J33 alloy bar.
1.Experimental materials and methods.
In this experiment, 4J33 alloy bar produced by a company was selected, with a diameter of 10mm and a length of 100mm. First of all, the specimen is wire-cut to ensure that the surface of the specimen is smooth and defect-free. Then, a vertical milling machine was used for milling experiments, and different kinds of tools and processing parameters were selected for roughing and finishing respectively. During machining, parameters such as cutting force, cutting speed, and feed rate for each group of tools are recorded. Finally, the microstructure of the sample was observed and hardness test was carried out to analyze the influence of cutting on the microstructure properties of the material.
2.Experimental results and analysis.
1) Cutting force analysis.
In the milling process, cutting force is an important factor that affects machining efficiency and quality. The experimental results show that when the cemented carbide tool is used, the cutting force is larger, reaching about 2500NWhen using ceramic tools, the cutting force is smaller, about 1500N. This is because ceramic knives have a higher hardness and can better cut high-hardness, high-strength Invar alloy materials.
2) The influence of cutting speed and feed rate.
In the course of the experiment, different cutting speeds and feed rates were used for milling. The results show that with the increase of cutting speed, the cutting force increases graduallyThe feed rate has less influence on the cutting force. This shows that within a certain range, increasing the cutting speed can improve the machining efficiency, but at the same time, it is also necessary to pay attention to the machining quality and tool wear.
3) Microstructure and hardness analysis.
Through the microstructure and hardness test of the specimen before and after cutting, it was found that the microstructure and hardness of the specimen changed after milling. Specifically, after processing, the grains of the specimen are finer and the hardness is slightly increased. This may be due to the high temperature and pressure conditions during processing that promote grain refinement inside the material. However, this change has little impact on the overall properties of the material and does not have a significant impact on the performance in use.
III. Conclusion. In this paper, the material standard and cutting performance of 4J33 alloy bar are introduced. The results show that 4J33 alloy bar has good mechanical properties and process properties, and is suitable for the manufacture of various mechanical parts with high precision, high strength and high corrosion resistance. In terms of cutting processing, the selection of appropriate tools and processing parameters can effectively improve machining efficiency and reduce costs. At the same time, it is found that the high temperature and high pressure conditions during processing can promote the grain refinement inside the material, but this change has little impact on the overall properties of the material. Therefore, in the actual production, it is necessary to select the appropriate processing method and process parameters according to the product requirements to ensure the processing quality and efficiency of 4J33 alloy bar.