【国外标准】 Standard Test Methods for Impact Testing of Cast Irons (Metric) (Withdrawn 2011)

This guide covers standard specification for the details of impact testing apparatus, test specimens, and procedures for cast iron, including gray iron, white iron, malleable iron, ductile iron, and austempered ductile iron, but not including chilled rolls or rolls with white iron skins. The Charpy-type impact test shall be employed for testing gray and white irons. The single-blow Charpy impact test for gray and white irons shall be carried out in a pendulum-type impact machine. The test specimens shall have a plain cylindrical form, machined or ground to a smooth finish and shall conform to the specified values of diameter, length, and span. The standard notch Charpy bar impact test specimen shall be employed. Characterization of the fracture toughness of any cast iron should be based upon testing three specimens.1.1 These test methods for impact testing cover the details of apparatus, test specimens and procedures for cast iron, including gray iron, white iron, malleable iron, ductile iron, and austempered ductile iron, but not including chilled rolls or rolls with white iron skins.1.2 The values stated in SI units are to be regarded as the standard. A companion standard, A 327, lists values in inch-pound units.This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.1.3 The Charpy-type impact test shall be employed for testing gray and white irons.1.4 Either the standard notched or unnotched charpy impact test shall be employed in testing of malleable or ductile irons. Selection of the type bar is dependent upon the specific material to be evaluated as defined in Section .1.5 Both types of charpy bars have been designated to characterize the fracture toughness of irons. The unnotched charpy bar, when tested, will produce substantially higher energy values than the notch bar type. The unnotched bar is therefore specified for testing irons that have low fracture toughness characteristics.