Try to explain how to change the properties of steel materials through phase transformation

The properties of materials include process performance and use performance.

Phase change to improve process performance: forging heating is generally between 1000-1200 ℃, heated to the phase change temperature, the material has plastic rheological resistance, easy upsetting and elongation. Hot stamping heated to the phase change temperature above, easy to stretch, and multiple stretching, without wrinkles and cracks.

Use properties include: mechanical properties, corrosion resistance, wear resistance, high-temperature oxidation resistance, and magnetic properties, etc.

Listed as martensitic heat-resistant steel Cr13 type must be heated to the phase transition temperature after quenching to obtain martensite to improve resistance to high-temperature oxidation. Mold steel Cr12 quenching, need to be heated to the phase transition temperature after quenching oil, low temperature tempering to obtain high hardness and wear resistance. Duplex steel S31803 for ferritic austenitic stainless steel, heated to austenitization after quenching, to obtain low temperature superplasticity. And so on