Fracture inspection of finished steel defects
Tianjin Rong Da Testing Co., Ltd. contact: Wang Jingfu
Cell phone: 13102238283 QQ:3144667033
Telephone: 022-23892103
Fracture test is one of the methods to determine the quality of steel. The fracture surface can be used to check the defects of the steel with the horizontal low magnification. The fracture can be directly displayed in the white spots, tapping inclusions, bubbles, internal crack, residual defects. The size and characterization of fracture grain can determine steel overheating and burning, can determine the fracture characteristics of steel (ductile fracture and brittle fracture of steel (parts)) and determine the causes of fracture (fatigue fracture and stress fracture etc.).
There are many types of fracture surface, such as ductile fracture, brittle fracture, porcelain fracture, layer fracture, fracture surface, fracture surface, graphite fracture and so on.
Parts damaged during use and in the manufacturing process for some reason the workpiece fracture damage, and the test force, force the fracture, without any preparation, you can directly observe and test, direct observation of the natural surface, can obtain direct information.
According to the requirements of different types of steel and test, fracture test specimen broken before after heat treatment in different ways, according to the different heat treatments, the fracture can be divided into fire promoting fracture and fracture and fracture annealing.
Fracture test is one of the common methods of macro inspection, which is an effective means to reflect the quality of materials and the quality of hot working process. The source of the fracture fracture test can be divided into two kinds, one is in the process of using mechanical fracture or fracture tensile test, impact test, two fracture specimen according to the provisions of the special. The former does not need any processing process, and the original surface of the fracture is analyzed, which is very convenient for the analysis of the macro structure and defects. Fracture of special, you can check out defects in steel segregation, white spots, inclusions, these defects in thermal processing, deformation and pressure distribution along the direction of deformation, so it should be possible to select longitudinal fracture analysis. General steel diameter larger than 40mm can be produced longitudinal fracture, diameter of less than 40mm of steel samples to produce transverse fracture.
Fracture analysis (fracture) is a subject that studies the fracture surface of metal, and it is a part of the fracture discipline. The breaking of a metal obtained by matching and fracture surface appearance, called fracture. It can be found that there are problems in the metallurgical defects and thermal process of steel.