why does ductile-brittle transition not occur in FCC?
why does ductile-brittle transition not occur in FCC?
(OP)
I know it is about vibration of atoms and dislocations but can you give me a brief explanation?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
why does ductile-brittle transition not occur in FCC?
|
why does ductile-brittle transition not occur in FCC?why does ductile-brittle transition not occur in FCC?(OP)
I know it is about vibration of atoms and dislocations but can you give me a brief explanation?
Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: why does ductile-brittle transition not occur in FCC?
Thread330-40730
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: why does ductile-brittle transition not occur in FCC?
The FCC crystal structure is generally immune to cleavage, although austenitic stainless steels can fail due to stress corrosion crack growth due to transgranular cleavage in certain aqueous solutions (e.g., NaCl solutions) [ref: ASM HANDBOOK Volume 19 Fatigue and Fracture]. Cleavage occurs along well-defined crystallographic planes ({100} facets and {112} tongues in BCC iron), which are not operable in FCC metals. For FCC crystals, slip occurs most often on {111} octahedral planes and in <110> directions that are parallel to cube face diagonals [ref: Deformation and Fracture Mechanics of Engineering Materials by R. W. Hertzberg]. In BCC crystals, slip occurs in <111> cube diagonal direction and on {110} dodecahedral planes. Slip occurs on {112} and {123} planes as well. Hence, dislocations that are operative in the BCC crystal can initiate cleavage, with cracks around the carbide particles providing a mechanism for continued propagation at relatively low stresses.