ABS Dnv CCS Nk Fh32 Mild Steel Plate/ Sheet For Shipbuilding

Stress - release Mechanism

There are significant structural and thermal stresses inside the shipbuilding steel plate after quenching. During the quenching process, the steel cools rapidly, so the internal structure doesn't have enough time to transform uniformly, thus generating stresses. During low - temperature tempering at 200°C, martensite begins to decompose, and this is a relatively slow structural transformation process. As martensite decomposes into tempered martensite, the internal structural and thermal stresses are gradually released. For example, it's like an over - compressed spring slowly recovering in a relatively mild environment. The internal stress state of the shipbuilding steel plate is improved, which enhances the toughness of the material.

This stress - release helps to reduce the possibility of cracks caused by internal stress concentration when the material is subjected to external forces. Because without tempering, the stress - concentrated area may become a crack source when subjected to a relatively small external force, and the stress - release after low - temperature tempering can effectively reduce this risk, thereby improving the toughness.

 

 

 

Effect of Dispersed Carbide Distribution: During low - temperature tempering, carbon precipitates from the supersaturated martensite in the form of fine carbides, and these carbides are dispersed in the matrix. When the shipbuilding steel plate is subjected to an external impact, the dispersed carbides can impede the movement of dislocations, causing the dislocations to consume more energy to bypass the carbide particles during their movement. This is like setting many small obstacles on the road, making the vehicles (dislocations) need more energy to pass through, thus increasing the material's energy - absorption capacity and improving the toughness. At the same time, the dispersed distribution of carbides can also prevent the propagation of cracks. Because when a crack encounters carbide particles during its propagation, its propagation direction will change or be blocked, further improving the toughness of the shipbuilding steel plate.

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