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What happens to the structural stress of the head during heat treatment?

发布时间：

2025-02-15

In the heat treatment process of the stainless steel head, due to the change of the structure, that is, the transformation of austenite to martensite, the increase of the specific volume will be accompanied by the expansion of the volume of the workpiece, and the phase transition of the workpiece has been caused by the volume growth is inconsistent and the organizational stress is generated. The final result of the structural stress change of the stainless steel head is the tensile stress of the surface and the compressive stress of the heart, which is exactly the opposite of the thermal stress. The size of the structure stress is related to the cooling rate, shape and chemical composition of the workpiece in the martensitic phase transformation zone. But the thermal stress has already produced the stainless steel head before the organizational transformation, and the organizational stress is generated in the organizational transformation process, in the entire cooling process, the result of the combined effect of thermal stress and organizational stress, is the actual stress in the workpiece. The result of the combined action of these two stresses is very complex, affected by many factors, such as composition, shape, heat treatment process and so on. In terms of its development process, there are only two types, namely thermal stress and organizational stress, which cancel each other when the direction of action is opposite, and overlap each other when the direction of action is the same. Whether they cancel each other or overlap each other, the two stresses should have a dominant factor, and the effect of thermal stress when it dominates is that the workpiece is strained and the surface is compressed. The effect of the predominant structural stress is that the compression surface of the workpiece core is strained.

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