The test and improvement of high temperature resistance of magnesium forgings of construction machinery is the key step to improve its service life and reliability. Here is a detailed answer to that question:
- High temperature performance test:
A. Material selection: First, select a representative magnesium alloy material as a test sample. Considering that construction machinery is often exposed to high temperature in the working process, a magnesium alloy suitable for high temperature working conditions can be selected.
b. Thermal stability test: The use of thermal stability test equipment to test the stability of magnesium forgings at different temperatures to determine their performance in high temperature environments.
c. Strength test: Test methods such as tensile test and impact test to determine the strength, ductility and impact resistance of magnesium forgings under high temperature conditions.
d. Microstructure observation: The changes of grain size, grain boundary characteristics, precipitates and other microstructure of magnesium forgings at high temperature were observed through metallographic microscopy and scanning electron microscopy. - High temperature performance improvement:
a. Adding appropriate alloying elements: By adding appropriate alloying elements to magnesium alloys, such as aluminum, zinc, rare earth elements, etc., it can improve its high temperature performance, improve oxidation resistance and thermal expansion resistance.
b. Heat treatment process optimization: By optimizing the heat treatment process, including the adjustment of heat treatment temperature, holding time and other parameters, the grain size and grain boundary characteristics of the material can be improved, and then improve its high temperature strength and ductility.
c. Surface coating technology: The use of appropriate surface coating technology, such as silicification, nitriding, etc., can improve the high temperature oxidation resistance and corrosion resistance of magnesium forgings.
d. Structural design optimization: Through reasonable structural design, such as increasing the support, increasing the bearing area, etc., can reduce the stress concentration of magnesium forgings under high temperature conditions, improve its deformation resistance and fatigue resistance.
To sum up, the high temperature performance test and improvement of magnesium forgings of construction machinery need to evaluate its performance through a series of test means, and take corresponding measures to improve its performance to ensure its safe and reliable operation under high temperature working conditions.
