Tensile and Fracture Properties of Manganese-Modified AISI 304 Type Stainless Steel
Abstract
The AISI-300 series stainless steels are austenitic Fe-Cr-Ni alloys offering relatively low strength but excellent cryogenic ductility and toughness. Recently, nitrogen-strengthened grades, such as AISI 304 N or AISI 304 LN, have attracted attention as possible substitutes for applications demanding higher strength. Nitrogen is a relatively inexpensive strengthener, and it stabilizes the austenitic structure with respect to martensitic phase transformation. A disadvantage of the nitrogen-strengthened grades is that they are more difficult to fabricate. To overcome this disadvantage, manganese additions (greater than the normal 1 or 2 wt.%) have been recommended. The potential advantages of manganese-modified type AISI 304 LN steels are: (1) consistent fabricability, (2) consistent weldability, and (3) reliable supply in all product forms.1 Other studies2–4 have reported potential advantages with manganese additions. It was the purpose of this study to investigate the effects of manganese on the 4-K mechanical properties of nitrogen-strengthened AISI 304 L type alloys. Therefore, a series of steels containing 1–6% Mn and 0.1–0.2% N were prepared, tested, and compared with previous results for Fe-18Cr- lONi stainless steels.5,6
Keywords
Fracture Toughness Fracture Property Manganese Content Torsion Balance Manganese AdditionPreview
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