SEDL / STP / STP756-EB / STP28444S

An Analysis of Two Casting Defects in Parts Made from ACI Type HF Heat-Resistant Stainless Steel

Bosak, EM
Manager and metallurgist, Materials and Processes Laboratory, General Electric Co., Erie, Pa.

Elmendorf, R
Manager and metallurgist, Materials and Processes Laboratory, General Electric Co., Erie, Pa.

Pages: 16    Published: Jan 1982

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Abstract

Subsequent to the production of American Casting Institute Type HF stainless steel castings, two types of casting defects have been found: hot tearing and shrinkage. Analyses of castings with these types of defects have been conducted. The hot tears were detected by fluorescent dye penetrant inspection and were found to be confined to certain similar locations in separate castings. The shrinkage was detected by gamma radiography and was confined to the interior of one casting. The investigation of the hot tearing condition has led to a metallographic definition of carbide distributions and a tentative microchemical description of the area containing the hot tear. A metallographic and microchemical characterization of the interdendritic region near those areas displaying shrinkage and microshrinkage in a different HF stainless steel casting has also been made. In both cases, a description of the means by which the casting defects were eliminated is included. Scanning electron microscope, energy-dispersive X-ray analysis, and surface replication techniques were used, as well as routine metallographic procedures.