Methods for producing locally hardened components

A method for producing a locally hardened component, comprising:

• S1:
• placing a to-be-heated portion of a base component in an induction coil and performing induction heating to form a heated portion, wherein the induction heating is gradient heating, a first heating temperature and a second heating temperature are formed in a cross-section of the to-be-heated portion of the base component wherein during the induction heating the first heating temperature is equal to a component quenching temperature +50° C., and the second heating temperature is equal to the component quenching temperature ±10° C. wherein the first heating temperature is the maximum temperature during the gradient heating, and the second heating temperature is the minimum temperature during the gradient heating;
• S2:
• after a completion of the induction heating, spraying a quenching solution on the heated portion, cooling the heated portion down to room temperature, removing the base component from the induction coil, and tempering the base component at a temperature of 100° C. to 250° C. to obtain a quenched component wherein the quenching solution comprises substances including:
• modified polyalkylene glycol PAG) copolymer, triethanolamine, monoethanolamine, calcium chloride, sorbitan monooleate, and deionized water in a mass ratio of 30 to 35):(0.3 to 0.4):(0.05 to 0.1:(2.5 to 3.5):1 to 3):(35 to 40);
• and
• S3:
• grinding, degreasing, and drying a hardened portion of the quenched component, coating a surface treatment solution on a surface of the hardened portion, curing the surface treatment solution, and performing an induction cladding on the hardened portion in a nitrogen atmosphere to obtain the locally hardened component.