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Metal

QuestionAnswer
Heat Treatment a controlled process used to change the microstructure of metals and alloys by controlled heating and cooling at various rates which results in a “forced” transformation.
Factors that effect heat treatment effectiveness 1 Metal & Alloy Additions 2 Microstructure 3 Prior Hot and Cold Work Treatments 4 Rate of Heating and Cooling
Stress relief/process annealing heat treating process where you heat the steel to a temperature below the critical range to relieve the residual stresses resulting from hot rolling, welding, shearing, or gas cutting. It does not change the material's structure
Annealing a heat treatment process used mostly to increase ductility and reduce the hardness of a material
Quenching It is the rapid cooling of a heat treated metal
Normalizing can be done immediately after quenching, used to remove the stresses due to welding, cold working or severe quenching. It provides a faster cooling rate than annealing
Tempering re-heating to moderate temperatures with slow cooling, used to increase ductility machinability and impact strength
LPI Liquid Penetrant Inspection
A very gentle method of cooling Air Quenching (cooling in the air)
Fastest form of quenching? Water or Brine Quenching
Visual test Look at the color, shine, weight, surface finish of the metal
Changing the structure from Austenite to Martensite causes the structure to be brittle, strong and hard
Distortion Caused by non-uniform heating and cooling of weld zone and base metal
Chemical Test dropping chemicals on a metal’s surface to look for color change or reaction.
Magnetic test Helps sort ferrous and non-ferrous metal
Mill test certificates show the alloys in metal and tell you how to properly heat the metal
Created by: Akinsman
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