Heat treatment of tool steels, Mechanical Engineering

Heat Treatment of Tool Steels

This treatment in case of tool steels in a significant step before actually employing the tool. Most properties are attained after heat treatment. There are specific special but essential precautions to be seemed in heat treating tool steels. That type of precautions may be clear knowing of austenising temperature that is affected greatly by addition of alloying elements.

Normalizing and Annealing

Normalizing becomes essential in case of forged tools. Forging induces unneeded residual stresses, non-uniform and coarse grains structure. These defects are eliminated by normalizing treatment. The normalized tools are machined to accurate dimensions. That machining increases the hardness due to strain hardening.

The middle annealing from simply below A1 temperature is applied upon the tool to eliminate the effects of strain hardening.

The tools steels comprise lower thermal conductivity and whether the tool is heated on a faster rate distortion and cracking may arise. To ignore such cracking and distortion the tool before any of treatment is preheated slowly to temperature in between 600 to 800oC. The tool is held on the preheat temperature adequately long to permit entire body to come to uniform temperature and after that heat to needed temperature for any of treatment.

Austenising

Given preheat the tool is austenised via heating to correct austenising temperature to acquire fine grained austenite whether carbides are dissolved.

Quenching

The austenised tool is quenched in air, water, brine, oil or molten salt bath depending on the harden-ability and thickness of cross-section. The cooling correct rate will choose the quenching media and cooling faster than the correct rate will consequence in beneath stresses.

The distortion of tool in extremely conveniently avoided via austempering or martempering.

Posted Date: 2/26/2013 6:44:35 AM | Location : United States







Related Discussions:- Heat treatment of tool steels, Assignment Help, Ask Question on Heat treatment of tool steels, Get Answer, Expert's Help, Heat treatment of tool steels Discussions

Write discussion on Heat treatment of tool steels
Your posts are moderated
Related Questions
Q. Design Gas Compressors? As gas compressors are often high investment equipment, it makes sense to locate these well away from other equipment to minimize potential fire dama


The Mechanical Engineer/Specialist shall prepare Material Requisitions for all required mechanical material and equipment. The format for all requisitions shall be in accordance w

WORKSHOP DISCIPLINES Following discipline tips should be made a part of life to become a good technician. These will certainly help in creating safe, friendly and clean enviro

Explain the working of Michelson's interferometer. How circular fringes he produced with it. (a) What are antireflection films and interference filters? (b) Find the reflecti

Screw Driver: Screwdrivers of different sizes are used to tighten or loosen screws. These are made of vanadium steels. A typical screw driver is shown in Figure. Fig

point load in overhanging beams

what is gear kinematics

Determine the reaction at specific points: A light rod AD can be supported by frictionless pegs at B and C and rests against frictionless wall at A as shown in th

Plate clutch lifter bolts for even tightening : Reset clutch assembly using plate lifter clutch alignment tool.