Mechanism of plastic deformation of pipe steel 15Kh1M1F

Conclusions

• 1. Deformation of annealed metal at room temperature occurs mainly in the body of ferrite grains, and in the initial stages (up to 1%) is due to fine slip. After quenching and tempering no difference is observed in the distribution of deformation in microvolumes of the structure.

• 2. At 570°C the effect of deformation in the boundary areas increases in the annealed condition, while shearing in the body of grains of intermediate decomposition of austenite increases with quenching and tempering.

• 3. Tempering of welded joints does not produce a sufficient increase in the plasticity of the weld seam. Deformation of the fused metal results mainly from widening of the grain boundaries and the formation of cracks in them, with almost no intragranular deformation.