Case Hardened steel with case depth showing a layer of high percentage of retained austenite
Porosity Analysis:
Porosity, small and large (micro and macro), can have a great effect on the engineering properties of metals including ductility, resistance to impact, fracture toughness and can cause leaks in systems. Especially in castings, porosity can cause problems during machining and cause premature failure. A check of the material for porosity can avoid problems and can act as a quality inspection for many processes including: Casting, Forging, Forming, Welding, etc. We can perform this inspection and qualify the material and quantify the porosity if ected. We have many different methods depending on the material and process for examining for this type of defect in the material or weld. A typical report will include photomacrographs and photomicrographs with digital measurements and a comments section and opinion on what is found. Testing is typically conducted by image analysis & clear area percentages, distribution, and size.
ASTM A262 Practice E Experiment
Susceptibility of austenitic Stainless Steels to intergranular attack
The objective of this experiment is to use copper-copper sulfate – sulfuric acid test to determine the susceptibility of austenitic stainless steels to intergranular attack associated with the precipitation of chromium-rich carbides. After exposure to the boiling solution, the specimen is bent. Intergranular cracking and/or crazing is evidence of susceptibility. This test may be used to evaluate the heat treatment and as-received material. It may also be used to evaluate the effectiveness of the stabilizing element additions and reductions in carbon content to aid in resisting intergranular attack. All wrought products and weld material of austenitic stainless steels can be evaluated by this test.
