Mechanical property testing of metal castings and forgings required by national standards GB/T3808 and GB/T229

There are generally two types of mechanical performance testing for metal castings and forgings required by national standards GB/T3808 and GB/T229: impact resistance testing and tensile resistance testing.

Impact resistance performance testing:

Metal castings and forgings can fracture when subjected to high impact forces. Impact resistance testing can not only test the impact force that components can withstand, but also determine whether the selected material is suitable.

Using equipment

The Joint Inspection Charpy Pendulum Impact Tester is used to measure the resistance of metal materials to impact under normal or low temperature dynamic loads, in order to determine the properties of materials under dynamic loads. The equipment is developed and produced in accordance with the national standard GB/T3808 "Pendulum Impact Testing Machine", and meets the requirements of the national standard GB/T229 "Charpy Notch Impact Test Method for Metal Materials" for impact testing. The control system adopts professional industrial control microcomputer control, touch screen operation and display of detection results, easy operation, and high work efficiency. The testing machine has functions such as fully automatic swing taking, swing placing, impact, sample sending, and data recording, which can better demonstrate its superiority for metallurgical and mechanical manufacturing departments that conduct continuous and large-scale impact tests. According to the properties of the material, impact testing equipment with different energies and structures such as 300J, 500J, 600J, 750J, etc. can be selected.

Tensile performance testing

The process from steel billet to final forming is a time-consuming and highly mature production process, and casting technology is an economical and efficient method for processing complex shaped components. The casting method can directly produce finished or semi-finished products, thereby reducing the required amount of processing to a certain extent. Similar to castings, forgings typically have irregular shapes. In many cases, the standard sample taken from castings or forgings cannot represent the characteristics of the entire component. Therefore, it is necessary to test the entire casting or forging. Due to their different shapes and sizes, it is difficult to clamp these components, and high forces are usually required during testing.

Use experimental equipment

To meet the testing requirements of hot rolling, castings, and forgings, CMT series electronic universal testing machines or WAW series microcomputer controlled electro-hydraulic servo universal testing machines are used for static performance testing and analysis of metals such as tension, compression, bending, shear, peeling, tearing, and load holding. They have three control modes: stress control, strain control, and displacement control. During the testing process, the three modes can be smoothly switched according to the set program, and can automatically obtain test parameters such as ReH, ReL, Rp0.2, Fm, Rt0.5, Rt0.6, Rt0.65, Rt0.7, Rm, E, etc., and can perform mechanical testing and analysis according to international standards such as GB, ISO, DIN, ASTM, JIS, etc; These loading racks can be equipped with various fixtures and extensometers used for testing standard specimens to produce accurate modulus and results. When testing complete components, customized fixtures, T-slot test benches, or specialized fixing devices can be configured on the loading rack to fit the shape of the tested components. Fully understand and determine specific applications, testing conditions, and material characteristics to provide accurate fixture solutions that meet user needs.