Oil Quenching

Advantages of Oil Quenching Steel Forgings, Machined Parts, Gears and Tooling Oil quenching is a common method for hardening alloy steel forgings. It is ideal for achieving the required strength and hardness properties on many alloys. When you oil quench steel forgings, there’s also less risk of cracking compared to water quenching or polymer quenching.

Water Quenching

Water quenching is a rapid cooling, where water as a qenching medium extracts heat much faster. ... Water cooling typically will give you higher hardness but more stressed component.

Tempering

Tempering Heat Treatment for Superior Ductility in Steel Components Tempering is a process for steel components which yields a bainitic microstructure.

  Higher tempering temperature reduces Hardness

 True tensile strength

  Yield point

Tempering is a two-step process which yields a tough and strong bainitic microstructure.

The first step in the process is to heat the steel component to a temperature at which it is in the fully austenitic phase and soaking at this temperature for a period of time. This ensures temperature uniformity throughout the entire section.

Long slender parts or steel components that are thin in the cross section are excellent candidates for austempering. Another excellent application for the austempering process are parts that are sensitive to quench cracking due to material or design.

Gas Carburising Process. Gas Carburising Process is a surface chemistry process, which improves the case depth hardness of a component by diffusing carbon into the surface layer to improve wear and fatigue resistance.

  • - Hard and wear-resistant surface
  • - Tough impact resistant core
  • - The best of both worlds
  • - Typical depth of carburisation; 0.5 to 3mm
  • - Typical Temperature is about 950C
  • - Quenching to achieve martensite on surface and sub-surface
  • -If needed, tempering to refine grain size and reduce stresses

Heat the steel slowly to 650-700°C and thoroughly soak. Continue heating the steel to the final hardening temperature of 870-930°C and allow the component to be heated through. Quench in oil. Temper the spring steel immediately after quenching whilst tools are still hand warm. Through Hardening for Medium Carbon & Spring Steel PartsAustempering for Spring Steel Parts like Circlips,Washer, Ground Disc,etc…..

  • Normalizing process is a heat treatment process for making material softer but does not produce the uniform material properties as produced with an annealing process.
  • The most common reason for the normalizing process is to adjust mechanical properties to suit the service conditions.
  • The other purpose of the normalizing is:
  • To relieve the internal stresses,
  • To refine the grain structure, and
  • To improve the machinability.

Stress relieving is a general term in heat treating, describing a wide range of processes. Generally, metal stress relieving involves heating a part to a temperature at which the yield strength is sufficiently low to the point which internal stresses can relieve themselves. Higher temperatures and longer times are beneficial and will yield a part with lower internal stress. Temperatures are always below the point at which there is a change of phase in steel.

Bending, welding, grinding, rolling, cold working, solidication, quenching, stamping, and other operations, can introduce new stresses into the structure of a metal part. Stress relieving is a heat treatment process designed to relieve residual stresses caused any such manufacturing process.

Sub-critical annealing is a relatively low temperature heat treating process used to reduce the hardness and increase the ductility of casting. The sub-critical annealing process results in casting with improved machinability and a reduced likelihood of cracking during cold working operations.

The sub-critical annealing process is a relatively low temperature heat treat process with temperatures ranging from 1275F to 1450F depending on the material. The parts are heated to the specified temperature and held at that temperature for sufficient time to insure the parts are uniform in temperature throughout the largest cross section. Sub-critical anneals typically require cooling in the furnace at a rate slow enough to meet the specified hardness and mechanical properties

Solution annealing (also referred to as solution treating) is a common heat-treatment process for many different families of metals. Stainless steels, aluminum alloys, nickel-based superalloys, titanium alloys, and some copper-based alloys all may require solution annealing.

The process of solution annealing is typically applied to stainless steels and high nickel alloys for heat resistant and corrosion resistant applications. These are generally high temperature processes requiring rapid quenching.

The most common application of the solution annealing process is used for austenitic stainless steels.

Solution annealing 300 series stainless steels improves corrosion resistance by putting carbides into solution in the microstructural matrix. solution annealed to appreciably change mechanical properties

© 2018 All Rights Reserved | Shreya websoft

Log in to Webmail
good hits