Accession Number : AD0817378

Title :   EFFECT OF RESIDUAL ELEMENTS ON THE NOTCH TOUGHNESS OF 12NI-5CR-3MO MARAGING STEELS.

Descriptive Note : Technical rept.,

Corporate Author : UNITED STATES STEEL CORP MONROEVILLE PA APPLIED RESEARCH LAB

Personal Author(s) : Dabkowski, Donald S. ; Hamburg, Emil G. ; Porter, Lew F.

Report Date : 01 AUG 1967

Pagination or Media Count : 42

Abstract : A 56-steel statistically designed study was conducted to determine the effects of C (0.002 to 0.038%), Mn (0.001 to 0.21%), S (0.001 to 0.032%), Si (0.002 to 0.017%), and N (0.001 to 0.025%), on the toughness of 12Ni-5Cr-3Mo maraging steels. Analysis of the results of the study provided an equation predicting the effects of the residual elements on Charpy V-notch energy absorption at 0 F. The equation indicated that the individual effects and their interactions are complex. In general, the detrimental effect of carbon and nitrogen on toughness was large when other residuals were at low levels and small when other residuals were at high levels. Except for a deleterious interaction with silicon, manganese did not cause a serious loss in toughness and was beneficial when all other residuals were low. Sulfur was most detrimental, with increasing sulfur content resulting in a marked decrease in notch toughness. Increasing silicon also resulted in a marked decrease in toughness particularly at high (0.10%) silicon levels and when the manganese was high. Titanium sulfides, carbides, and nitrides were established by metallographic examination as the probable reason for the effect of sulfur, carbon, and nitrogen on notch toughness. No metallographic evidence was found to explain the effects of manganese and silicon on toughness. (Author)

Descriptors :   *NOTCH TOUGHNESS), (*MARAGING STEELS, DEFECTS(MATERIALS), SPECTROSCOPY, MOLYBDENUM ALLOYS, CHROMIUM ALLOYS, ABSORPTION, METALLOGRAPHY, IMPACT TESTS, TITANIUM COMPOUNDS, SULFIDES, CARBIDES, NITRIDES, MANGANESE, INTERACTIONS, SILICON, GRAIN SIZE, MICROSTRUCTURE, VACUUM, ROLLING(METALLURGY), QUENCHING, WATER, STATISTICAL ANALYSIS, ELECTRON DIFFRACTION, X RAY DIFFRACTION, DEPOSITION.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE