Processing - Technique Factors

Hot - Working Process: During hot - working processes (such as forging, hot - rolling, etc.), unreasonable processing parameters can reduce the fracture toughness of the material. For example, an excessively high forging temperature may lead to grain growth. As mentioned earlier, coarse grains will reduce the fracture toughness. In addition, if the deformation speed during forging is not appropriate, it may also cause stress concentration inside the material and produce defects such as micro - cracks. During the hot - rolling process, if the final - rolling temperature is too high, abnormal phase compositions may appear in the material's microstructure, affecting the material's toughness.

 

 

 

Environmental Factors

Temperature Effect: Temperature has a significant impact on the fracture toughness of materials. In a low - temperature environment, many materials will undergo a ductile - to - brittle transition. For example, for some body - centered - cubic - structured metallic materials, as the temperature decreases, the intermolecular binding force and dislocation - movement ability decrease, and the material will change from a ductile state to a brittle state, with a significant reduction in fracture toughness. In a high - temperature environment, the material's microstructure may change. For example, some alloys will undergo a phase change at high temperatures, and the formation of a new phase may lead to a decrease in the material's toughness or the occurrence of hot - embrittlement, making the material more likely to fracture when subjected to force.

Corrosive Environment: When a material is in a corrosive environment, a corrosion reaction will occur on its surface. Corrosion will form corrosion pits or holes on the material's surface, and these local areas will become stress - concentration points. As the corrosion progresses, cracks may start to generate and propagate from these stress - concentration points. Moreover, the corrosive medium may also react chemically with the components inside the material, changing the material's microstructure, such as weakening the grain boundaries or forming brittle compounds, thereby reducing the fracture toughness of the material.

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