Forging quality analysis of the basic standard method

With the increasingly development of modern industry, the use of products with higher performance requirements. As forgings, in the forging process for it took a strict quality control and inspection measures, it is necessary to prevent forging defects and improve the quality of forgings. Due to the complexity of causes of forgings quality problem, determines the analysis method of diversification; And forgings in the importance of mechanical products, and determines the quality of forgings metallurgy high-standard. Especially in some forging defects may lead to the deterioration of material performance, is the 'internal medicine disease' on the metallurgical quality, hidden deep, harm is big, therefore in forging the metallurgical quality control, in addition to conventional chemical method such as spectral analysis, macro and micro analysis is still in use, the current new test methods and instruments and equipment is more rapid, accurate, the characteristics of automation. Forgings quality analysis method, different depending on the type of defect and focused. The forging itself quality problems are generally associated with heating and deformation. Therefore, the surface defect - Crack, folding, etc. , all has scale, and its internal defects and the performance is unqualified, is related to the thermodynamic factors in the process of forging. This determines their analysis methods mainly include low power test, metallographic test and metal deformation and flow analysis test. This needs to be analyzed the defects of forgings anatomy, from the defect sample analysis, so it is also referred to as a destructive test. Macrostructure test can reveal forgings of macroscopic defects, such as test including sulfur print test, cold hot corrosion and the corrosion of acid leaching test and fracture test, etc. High power organization for research and analyze the defect of microscopic characteristics, formation mechanism has important significance. Of metal deformation and flow analysis test to analyze the crack, folding, and the formation of coarse grain, streamline distribution and through have a special meaning. When forgings quality analysis, will tend to be low power test, metallographic test and metal deformation and flow analysis test combining simultaneously, so it's possible to combine the nature of the defect with formation has a more complete understanding. Both macrostructure experiment or high power organization, should be carried out according to the prescribed test methods. Forging test method standard of each test items see table: further in-depth study of the nature and the formation mechanism of defect method, can use type transmission type or scanning electron microscope and electron probe. Double-action microscope equipped with a microcomputer, television screens and automatic scanning measuring device, in addition to the general microscopic observation, still can determine the distribution of the inclusions, the size and composition of the sample. In terms of chemical analysis, in order to determine the composition of macro and micro segregation, conventional chemical analysis method, low efficiency, error is large, some trace of harmful elements cannot be determined. The latest electronic computers control the direct reading of emission spectrograph, equipped with computer, automatic typewriter and TV show of the X-ray fluorescence spectrometer and other new testing methods and instruments, reflected the quality analysis method to the development of rapid, accurate and efficient characteristics. It can be said that forgings quality analysis method, which is continuous improvement, and improve day by day, will help to improve the quality of forgings and prevent forging defects. For some important large forgings military large forgings, destructive test and test analysis of conventional technology has already can not adapt to the needs of the development of technology, must use a special non destructive test methods. The rapid development of the nondestructive flaw detection technology with wide application will lead to improvements in quality of forgings. On the analysis of the forging quality, using nondestructive flaw detection method can be carried out on the same batch of forgings all test, in order to find the rule of forging defects, easy to cause the one-sidedness in avoid destructive test. This to reliably ensure the quality of forgings is beneficial, especially for some production less number of heavy forging is more than a quick save test method. On the analysis of the quality of forgings, the commonly used NDT methods mainly include ultrasonic testing, penetration testing and magnetic inspection. Ultrasonic adventure hurt the most widely used, which is used to test forging internal defects, magnetic detection and penetration inspection ( Staining and fluorescence) Used to examine the forging surface defects. NDT equipment is the development trend of miniaturization. Process automation and standardization of test specification. NDT methods, help to eliminate or reduce forgings in the miss rate in the process of production, timely finding defects and improving the forging quality, so the test technology will get more and more widely used. To sum up, the characteristics of the forgings quality analysis method is widely used in all kinds of test techniques and test methods. This will in forging quality inspection and analysis to its rightful place.