Mechanical Properties changes, Delta Ferrite in 416 Stainless
Mechanical Properties changes, Delta Ferrite in 416 Stainless
(OP)
Has anyone run across any good information on mechanical or fracture property effects of large amounts of delta ferrite in the 400 stainless series materials, particularly 416SS?
This is not a welded application as so many of the ferrite affects literature is about.
This is not a welded application as so many of the ferrite affects literature is about.





RE: Mechanical Properties changes, Delta Ferrite in 416 Stainless
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Regarding notch toughness, I would presume that since sulfur inclusions would have a greater impact (no pun intended) on the fracture behavior of 416 ss, having delta ferrite stringers really would not matter as such.
RE: Mechanical Properties changes, Delta Ferrite in 416 Stainless
P. H. S. Cardosoa, C. Kwietniewski, b, J. P. Portoa, A. Regulya and T. R. Strohaeckera
a Post-Graduate Program in Metallurgical, Mining and Materials Engineering—PPGEM, Av. Osvaldo Aranha, 99/610, Porto Alegre 90035-190, Brazil
b University of Vale do Rio dos Sinos—UNISINOS, Av. Unisinos 950, Sao Leopoldo 93022-000, Brazil
Received 11 April 2001; revised 2 July 2001. Available online 27 March 2003.
Abstract
Delta ferrite in martensitic stainless steels may have an adverse effect on the mechanical properties of these materials at high temperature. The occurrence of such phase is determined by the material chemical composition (mainly Cr and C), as-received microstructure condition and hot working temperature. The aim of this investigation is to assess the influence of delta ferrite on the hot workability of the martensitic AISI 416 stainless steel. Hence, different heats of this material (differing in chemical composition and as-received microstructure) were submitted to heating tests in order to observe the microstructural transformations that take place at high temperature and then examine the influence of these transformations on the mechanical behaviour. Phase characterisation and quantification were carried out using scanning electron microscopy/energy-dispersive X-ray microanalysis and image analysis. The heating tests were performed in the temperature range of 1100–1350 °C and hot workability in two heats with different delta ferrite content was assessed by hot torsion tests in the temperature range of 1000–1250 °C. The results have indicated that chemical composition and as-received microstructure strongly affect delta ferrite formation, which in turn deteriorates hot workability of the martensitic AISI 416 stainless steel.
RE: Mechanical Properties changes, Delta Ferrite in 416 Stainless
RE: Mechanical Properties changes, Delta Ferrite in 416 Stainless
Is this very low C material?
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Plymouth Tube
RE: Mechanical Properties changes, Delta Ferrite in 416 Stainless