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发表于 2009-8-25 14:06:55
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以下是从600的专业文献里摘出来的,稍学过英文的能看懂,大致意思好理解
In general, an annealing treatment of about 1850°F/15
min (1010°C/15 min) will produce soft material. Brief
exposure to 1900°F (1040°C) will give soft material without
producing a coarse grain structure. Grain growth does not
occur until the alloy is heated to about 1800°F (980°C). At
that temperature, the finely dispersed carbide particles in the
alloy’s microstructure, which inhibit grain growth, begin to
coalesce. Solution of the carbides begins at about 1900°F
(1040°C). Treatment for 1 to 2 hr at 2000° to 2100°F (1090°
to 1150°C) dissolves the carbides completely and results in
increased grain size. This solution treatment is beneficial in
obtaining maximum creep and rupture strength.
In general, material with a fine grain structure is
preferred because it has better corrosion resistance and
higher tensile, fatigue and impact strength. Fine-grain
material is preferred for all low-temperature applications,
most intermediate temperature applications, and those hightemperature
applications which require resistance to shockand corrosion.
Grain size is dependent on processing. Hot-rolled products
will usually have a small grain size because they are finished
at relatively low temperatures. Annealing has little effect on
the grain size of hot-rolled material. Cold-drawn or coldrolled
material, in either the cold-worked or annealed
condition, will have a small grain size. Solution treatment
will produce a coarse grain structure in either hot-worked or
cold-worked material.
The time and temperatures required for recrystallization
of cold-worked material vary widely, depending on the
amount of cold work and the specific composition. Table 25
shows times and temperatures required for recrystallization
of fine-grain sheet after various amounts of cold reduction.
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