MEHOD OF TEST
MICRD-INCLUSION RATINGS SHALL BE PEREFORMED ON POLISHED UNETCHED SPECIMENS 0.25IN INSURFACE OF LARGER PER ASTM DESIGNATION 345。THE SURFACE TO BE EVALUATED SHALL BE PARALLEL TO THE DORECTION OF GRAIN FLOW .AND EXAMINED AT 100X THE SAMPLES SHALL BE EVALUATED IN ACCRDANCE WITH ASTM DESINGNATION E45 ,METHOD A, USING JERNKONTORE CHART1
谢谢,还有一段再请帮忙翻译一下, the microstructure at the surface or near the surface shall be martensite and austenite with a surface hardness of not less than rc57 or the minimum specified
intergranular ox ides and associated transformation products are allowed ,but to a depth no greater than 0.0254mm. where performance reouires no intergranular oxindes or associated transformation products .this should be specified in the print.
well-distributed globular carbides are permitted ,closed network grain boundary carbides are not permitted ,small amounts of bainite in t-e case .w-ile not desirable. is permissible .