24小时热门版块排行榜

返回列表

【奖励】本帖被评价12次，作者zjys5887增加金币 9.8 个

当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

zjys5887

木虫 (文坛精英)

应助: 12 (小学生)
贵宾: 0.05
金币: 8.7
帖子: 15702
在线: 1925.3小时
虫号: 782373

[资源] 【资源】aluminum alloy castings properties processes and applications

Aluminum Alloy
Castings
Properties, Processes, and Applications
J. Gilbert Kaufman
Elwin L. Rooy
1.1 Background and Scope
It is the objective of this book to comprehensively summarize
material properties and engineering data for aluminum alloy cast-
ings and to address the need for a single reference that covers
production, quality assurance, properties, and applications of alu-
minum alloy castings.
Unlikemost sources, the content addresses not only conventional
sand and permanent mold castings, but also pressure die castings
and many of the variations of all three that have developed over
the years.
The physical and mechanical properties of aluminum castings
may be altered through:
• Alloying composition: The composition of alloys determines
the potential for achieving speciﬁc physical and mechanical
properties. Alloy content is designed to produce characteristics
that include castability as well as desired performance capa-
bilities. The interaction of alloying elements is recognized in
promoting desired microstructural phases and solid-solution
effects for the development of these properties.
• Cooling rate during and after solidiﬁcation: The conditions
under which solidiﬁcation takes place determine the structural
features that affect the physical and mechanical properties of an
alloy.
• Casting process: There are a large number of casting processes,
and each imposes different rates of heat extraction, solidiﬁca-
tion rates, and means of compensating for solidiﬁcation-related
microstructural and macrostructural tendencies.
• Solidiﬁcation: Engineered castings are susceptible to internal
and superﬁcial defects. The complex geometries of shaped cast-
ings, ﬂuid dynamics, and solidiﬁcation mechanics combine to
present unique and difficult challenges to the objective of dense,
discontinuity-free parts. Internal porosity can result fromshrink-
age and hydrogen porosity, as well as from visually detectable
defects such as misruns, cracks, moisture reactions, folds, and
tears. Nonmetallic inclusions affect mechanical properties and
nucleate hydrogen pore formation. Pore volume fraction and
the geometry and distribution of internal voids reduce tensile
properties, fatigue strength, toughness, and ductility, while sur-
face defects strongly inﬂuence mechanical and fatigue perfor->>>>>>>>

http://d.namipan.com/d/13d472e45 ... cf4daf1cf7a7e10a900

http://d.namipan.com/d/13d472e45 ... cf4daf1cf7a7e10a900
http://d.namipan.com/d/13d472e457bc9c1dd8b2e152e7785cf4daf1cf7a7e10a900

回复此楼