Annealing Work





With the exception of several of the higher types

of alloy steels, where the percentages of special elements run quite

high, which causes a slight air-hardening action, the carburizing

steels are soft enough for machining when air cooled from any

temperature, including the finishing temperature at the hammer.

This condition has led many drop-forge and manufacturing concerns

to consider annealing as an unnecessary operation and expense.

In many cases the drop forging has only been heated to a low

temperature, often just until the piece showed color, to relieve

the so-called hammer strains. While this has been only a compromise

it has been better than no reheating at all, although it has not

properly refined the grain, which is necessary for good machining

conditions.



Annealing is heating to a temperature slightly above the highest

critical point and cooling slowly either in the air or in the furnace.

Annealing is done to accomplish two purposes: (1) to relieve mechanical

strains and (2) to soften and produce a maximum refinement of grain.





Annealing To Relieve Internal Stresses Application Of Liberty Engine Materials To The Automotive Industry facebooktwittergoogle_plusredditpinterestlinkedinmail

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