Heat treatment process

 

 

Heat treatment process

 

 

Improve performance and mechanism

 

 

Quenching, tempering 950°C×12min oil quenched, after tempering at 500°C×3h Air cooling

 

σ bb increases 70~164MPa, quenching α - Co→ ε transition, increasing the face center cube in the matrix

 

Quenching and tempering Heated oil quenched, tempered at 700°C

 

σ bb increased by 42%, strengthening the solid solution strengthening of the binder phase; Used to reduce the number and width of dislocations and suppress the β-Co direction α-Co transition

 

Boronizing and boron borax Co-permeability 1000°C±10°C, 20% borax (dehydration)+20%SiC+52%NaCl+5%Na2CO3 plus 2% ~ 3% rare earth lanthanum (all mass fractions), Boronizing Warm oil quench and two stress relief annealing

 

σ bb increase 150~200MPa; hardness increase 5~10HRC; impact toughness increased 15% to 20%; wear resistance; Increased 45% to 65%, the life of the mold increased by 0.5 to 1 times

 

Carburizing Carburized, oil quenched, tempered at 500°C

 

Surface hardness increased by 29%, hardness was 1455 HV, improved 6%; wear resistance increased by 3 times, tempering after quenching should be promptly tempered

 

Double quenching Tempering treatment 1280°C oil quenching +850°C oil quenching +500°C tempering

 

σ bb increased by 17.5% and fracture toughness increased by 37.2%; Reduces intergranular fractures and cleavage fractures. If cryogenic treatment is used, Increased bending strength and fracture toughness increase

 

Vacuum heat treatment Sinter in vacuum and heat in vacuum, 1250°C. Insulation oil quenched at 400 °C air furnace tempering

 

wear resistance increased by 37.3%;Life increased by 34%, wear resistance increased by 27.2%

 

Ion Implantation Inject nitrogen ions into 5×10N/cm 2 to inject molybdenum ions. Molybdenum plus carbon ion, titanium ion plus cerium ion

 

The best wear resistance, surface hardness and wear resistance high. Lattice distortion, forming a new strengthening phase

 

Laser heat treatment laser surface hardening

 

1x tool life, grain refinement, instantaneous high temperature WC-W or C dissolves into the binder phase