Final answer:
The processes that can increase the deformation resistance of steel are tempering, adding alloying elements, and hardening. Hot working does not inherently increase resistance to deformation.
Step-by-step explanation:
The process that can increase the deformation resistance of steel include tempering, adding alloying elements, and hardening. Tempering involves heating steel that has been previously hardened, followed by controlled cooling, to decrease brittleness and therefore improve toughness and deformation resistance. Adding alloying elements like chromium, manganese, tungsten, and vanadium can also affect the steel's properties, making it more resistant to deformation. Hardening typically involves heating the steel to a high temperature and then cooling it rapidly to increase its hardness and resistance to deformation. Hot working, which is the process of shaping steel at elevated temperatures, does not inherently increase steel's resistance to deformation; it can make it easier to form.