STRUCTURAL STEEL FRACTURES
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
Fracture analysis as a means of indicating structural, quality, and processing differences is discussed. Under certain conditions brittle crystalline fractures will expose the size of the austenite grain existing before the moment of cooling the steel. Martempering of structural alloy steel as a rule produces, after low-temperature tempering 200 degrees, a fibrous fracture which is replaced during tempering at 300 to 350 degrees by a brittle intercrystalline fracture. At higher temperature tempering, if a brittleness of a second kind is not produced, the fracture again becomes fibrous. Other items discussed include heat treatment and processing effects such as phase transformation, and naphthalinic-type and stone-like fractures.