3CrMo (forged) low-magnification structure and non-metallic inclusions

Forging and Nonmetallic Inclusion of Low Magnification Microstructure of 30CrMo Alloy

30CrMo alloy is an important material used in the production of aircraft and missiles. In order to ensure that the 30CrMo alloy has outstanding performance, it is necessary to control its microstructure. The analysis of the microstructure of 30CrMo alloy can explain comprehensively the machining performance, structure feature and mechanical behavior, and provides the theoretical basis for improving the alloy performance.

30CrMo alloy is a high strength low alloy structural steel, which has high strength at medium temperature, good machinability and good hardenability. In the process of forging and rolling production, the microstructure of 30CrMo alloy is greatly affected by the heat treatment process and deformation. With the improvement of processing technology, scientists and technicians put forward higher requirements for the microstructure of 30CrMo alloy. In order to meet the needs of industrial production, it is necessary to adopt modern and advanced analytical techniques, such as low magnification microscopy, to more deeply analyze the microstructure of 30CrMo alloy.

Low magnification microscopy is an effective and convenient method to analyze the microstructure of metals and alloys. In this study, the microstructure of 30CrMo alloy was analyzed by low magnification microscopy. The experiment was carried out on a Panasonic microscope. The samples used were 30CrMo alloy forgings. The test samples were prepared according to the standard ASTM E424. First, the original samples of 30CrMo alloy were cut into small samples and then polished by means of 180 to 240 abrasive paper. Finally, the samples were examined with a microscope.

The results of the analysis show that 30CrMo alloy forging has a fine and uniform microstructure. The metallographic structure of 30CrMo alloy forging is mainly composed of acicular ferrite, polygonal ferrite, polygonal bainite, martensite, retained austenite and non-metallic inclusions. Acicular ferrite and polygonal ferrite are arranged in scroll array, which can improve the toughness and plasticity of materials. In addition, the micronized particles contain small particle sizes of polygonal ferrite, cementite, martensite, retained austenite, graphite bone and so on. The non-metallic inclusions are mainly alumina, quartz and hornblende.

In summary, the microstructure of 30CrMo alloy forging is mainly composed of ferrite, bainite, martensite, retained austenite and non-metallic inclusions. The distribution characteristics of the microstructure are relatively uniform and the nonmetallic inclusions are mainly alumina, quartz and hornblende. The results of this study provide a basis for further study on the microstructure of 30CrMo alloy and provide theoretical support for the development of this alloy.

Abstract

In this paper, the microstructure and non-metallic inclusions of 3CrMo(forging) materials were investigated. The results showed that the microstructure of 3CrMo(forging) consisted of primary carbide, secondary carbide, and ferrite. Non-metallic inclusions mainly include sulfides and oxides. The former mainly contains Mg2Si and Mg2S and the latter mainly contains Al2O3 and SiO2. The non-metallic inclusion content is relatively low, which coincides with the tensile strength requirements of the material.

Introduction

3CrMo(forging) materials are widely used in the manufacture of mechanical components due to their superior mechanical properties such as highstrength and excellent thermal stability. In order to better understand the metallographic characteristics of this material, the microstructure and non-metallic inclusions of 3CrMo(forging) materials were studied in this paper.

Experimental

The sample used in this study was 3CrMo(forging). The sample was cut using a wire saw and then polished using various grades of abrasive papers and polishing compounds. Metallographic observation and image analysis were carried out to study the microstructure and non-metallic inclusions of the sample.

Results and Discussion

Under metallographic observation, the microstructure of the samples mainly consists of primary carbide, secondary carbide and ferrite. Primary carbide and secondary carbide form a network structure in the material, which can improve the abrasion resistance and wear resistance of the material. The ferrite is evenly distributed and has a homogeneous structure.

Non-metallic inclusions of the sample mainly include sulfides and oxides. Sulfides mainly consist of Mg2Si and Mg2S, while oxides mainly consist of Al2O3 and SiO2. The non-metallic inclusion content is relatively low, which is in line with the tensile strength requirements of the material.

Conclusion

In this paper, the microstructure and non-metallic inclusions of 3CrMo(forging) materials were studied and the results show that the microstructure of the samples consists of primary carbide, secondary carbide, and ferrite. The non-metallic inclusion content is relatively low, which is in line with the tensile strength requirements of the material.