What Is Heat Fatigue?
The fatigue failure phenomenon of metal materials due to thermal stress cycles (or thermal strain cycles) caused by temperature gradient cycles is called thermal fatigue.
Thermal fatigue
Right!- Chinese name
- Thermal fatigue
- Foreign name
- Thermal Fatigue
- the reason
- Thermal stress cycle
- Condition
- metallic material
- Influencing factors
- Coarse and uneven grains
- The fatigue failure phenomenon of metal materials due to thermal stress cycles (or thermal strain cycles) caused by temperature gradient cycles is called thermal fatigue.
- When metal parts work under high temperature conditions, the ambient temperature is not constant and sometimes it changes rapidly and repeatedly. If the resulting expansion and contraction is restricted, it will occur inside the part.
- (1) Typical surface fatigue cracks are cracked.
- (2) The crack direction can be along the crystal type or through the crystal type; generally, the crack end is sharp, and the crack is filled with oxide.
- (3), the macro fracture is gray, and
- (1) The larger the temperature gradient and frequency of change in the environment, the more prone to thermal fatigue.
- (2) When materials with different thermal expansion coefficients are combined, thermal fatigue is likely to occur.
- (3) The grains are coarse and uneven, and prone to thermal fatigue.
- (4) The second phase particles distributed at the grain boundary have a promoting effect on the generation of thermal fatigue.
- (5) Poor plasticity of the material, prone to thermal fatigue.
- (6) The geometrical structure of the part has a large constraint on the expansion and contraction of the metal, and it is prone to thermal fatigue. [1]