EXAM 2 Flashcards
(25 cards)
Flame or plasma cutting must be performed at least ______ to ______ from the area to be examined.
1/4” to 1/2”
When a ______________ wheel is used to make the final cut, rough grinding is usually unnecessary.
diamond-tipped
A ________________ is a photograph of a microstructure.
photomicrograph
The density and shape of ________________ are the primary factors that determine the internal cleanliness of steels and other alloy systems.
iclusions
Describe the two most common specimen orientations that are used for metallographic examination.
Longitudinal - parallel to axis
Transverse - perpendicular to axis
What is the formation, while cooling from an elevated temperature, of a new strain-free grain structure from an existing grain structure?
Recrystallization
__________________ is plastic deformation performed above the recrystallization temperature.
hot working
_________________ is an undesirable increase in grain size caused by heating a metal above a certain temperature.
grain growth
_____________ is plastic deformation performed below the recrystallization temperature, which leads to work hardening.
cold working
Explain the two opposing effects of hot working.
There is a hardening effect which is caused by plastic deformation. And a softening effect which is caused by recrystallization.
What is a tiny void in the morphology of a ductile fracture surface?
Ductile dimple
When enough force is applied, a _____________ metal deforms plastically by permanently changing its shape to accommodate the stress.
ductile
What is the descriptive study of fracture surfaces using photographs, sketches, and text?
fractography
____________ cleaning is a cleaning method that uses the flow of electrical current to strip adherent deposits from a fracture surface.
cathodic
Describe the three failure zones of a fracture.
Initiation zone-
Propagation zone - growth of a fracture
Final failure zone - failure to the tensile overload
Physical identification markings may be _____________ on a product.
Embossed, stamped, stenciled
A certificate of _____________ is a statement from the manufacturer or supplier that a part meets the required specifications
Compliance
What kind of grinders are most often used for spark testing?
Portable
_________________ is a chief problem of spark testing and may lead to a false identification.
Decarburnization
Explain the difference between a certificate of heat analysis and a certificate of product analysis.
Specifications given in a certification of product analysis allows a wider range of chemical composition for each chemical element analyzed than in the corresponding specifications given in a certificate of heat analysis. Certification of product analysis provides more reliable identification.
A _______________ is a statement of technical and commercial requirements that a product must meet.
Specification
A _______________ is a set of instructions for performing one or more operations or functions other than the identification, measurement, or evaluation of a material.
recommended practice
The ________________________ is a nongovernmental international organization that is comprised of national standards institutions of 91 countries.
International Organization of Standardization
What is a standard or set of applicable regulations that a jurisdictional body has adopted as law?
A code
