P/M Ferritic Stainless Steels for Exhaust System Components

Baran, M.C.; Shaw, B. A.; Segall, A. E.; Kopech, Howard; Haberberger, Thomas E.

doi:10.4271/970282

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…In this section we briefly discuss robustness of polynomial approximation on algebraic curves. This is an important question in Approximation Theory, and its connection with a sort of analytic parametrization is well known (see [2]- [4], [53,54,55,83] and references therein). One of the main tools here is provided by "Remez-type" or "norming" inequalities, which compare maximum of a polynomial on the unit interval I = [−1, 1] with its maximum on a given subset Z ⊂ I.…”

Section: Remez-type Inequalities On Algebraic Curvesmentioning

confidence: 99%

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Smooth parametrizations in dynamics, analysis, diophantine and computational geometry

Yomdin

2015

Japan J. Indust. Appl. Math.

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Smooth parametrization consists in a subdivision of the mathematical objects under consideration into simple pieces, and then parametric representation of each piece, while keeping control of high order derivatives. The main goal of the present paper is to provide a short overview of some results and open problems on smooth parametrization and its applications in several apparently rather separated domains: smooth dynamics, diophantine geometry, approximation theory, and computational geometry. The structure of the results, open problems, and conjectures in each of these domains shows in many cases a remarkable similarity, which we try to stress. Sometimes this similarity can be easily explained, sometimes the reasons remain somewhat obscure, and it motivates some natural questions discussed in the paper. We present also some new results, stressing interconnection between various types and various applications of smooth parametrization.

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Section: Remez-type Inequalities On Algebraic Curvesmentioning

confidence: 99%

“…Important applications in Computational Geometry have been proposed ( [34,72,73,74] and Section 5.3 below). Also in Approximation Theory (especially in study of Polynomial Inequalities on algebraic sets) importance of parametrizations was well recognized ( [2,3,4,83] and Section 5.4 below).…”

Section: Introductionmentioning

confidence: 99%

Smooth parametrizations in dynamics, analysis, diophantine and computational geometry

Yomdin

2015

Japan J. Indust. Appl. Math.

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“…And therefore, Cr 2 N can be precipitated at grain boundary and the adjacent chromium is depleted. So a passive-active cell is formed between chromium-rich secondary compound and the adjacent chromium-depleted zones [11]. This will accelerate the corrosion rate of specimens and deteriorated the corrosion resistance.…”

Section: Effect Of Sintering Atmospheres On the Corrosion Behavior Of...mentioning

confidence: 99%

Effect of Sintering Temperature and Atmosphere on Corrosion Behavior of MIM 316L Stainless Steel

2011

AMR

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In the present study, effect of sintering temperature and atmosphere on corrosion behavior of 316L stainless steel specimens manufactured by metal injection molding (MIM) process were investigated. Sintering experiments were carried out at 1320°C, 1370°C and 1375°C under various sintering atmospheres, i.e. Ar+H2, Ar, N2+H2or N2. The corrosion behavior of as-sintered specimens was studied by weight loss immersion test in 5%HCl solution. The results indicated that a better corrosion resistance was accompanied higher density, finer and rounder surface pores. The specimens sintered under Ar+H2atmosphere at 1370°C had little susceptibility to intergranular corrosion.

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“…For example, in ferrous P/M alloys there are unique corrosion mechanisms operating which are absent in wrought materials of the same composition. 5–7 The corrosion resistance of P/M alloys, without secondary treatment, is generally inferior to their wrought counterparts due to the presence of residual open porosity. Secondary mechanical processing, such as sizing, provides an opportunity to reduce this disparity by closing surface porosity; however, the effects have not been quantified.…”

Section: Introductionmentioning

confidence: 99%

Effect of sizing on the corrosion behaviour of Alumix 123 P/M alloy in 3.5 wt-% NaCl solution

Judge

Bishop

Kipouros

2016

Corrosion Engineering, Science and Technology

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The corrosion behaviour of the commercial aluminium powder metallurgy alloy 'Alumix 123' after undergone 'sizing', a standard cold forming operation, has been studied in naturally aerated 3.5 wt-% NaCl solution through open circuit potential (OCP), cathodic potentiodynamic polarisation, cyclic potentiodynamic polarisation and potentiostatic polarisation experiments, and the subsequent corrosion morphology was characterised by scanning electron microscopy and energy dispersive X-ray spectroscopy. The results were compared to those obtained for Alumix 123 in the 'as-sintered' condition and to a compositionally similar wrought alloy, AA2014-T6. The sizing operation significantly affected the OCP, corrosion control, cathodic process, corrosion rate and corrosion morphology of Alumix 123. These changes are attributed to the reduction in open surface porosity brought about by the sizing operation. It appears that with a single secondary operation, sizing, the corrosion resistance of Alumix 123 is significantly improved and approaches that of AA2014-T6.

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P/M Ferritic Stainless Steels for Exhaust System Components

Cited by 10 publications

References 2 publications

Smooth parametrizations in dynamics, analysis, diophantine and computational geometry

Smooth parametrizations in dynamics, analysis, diophantine and computational geometry

Effect of Sintering Temperature and Atmosphere on Corrosion Behavior of MIM 316L Stainless Steel

Effect of sizing on the corrosion behaviour of Alumix 123 P/M alloy in 3.5 wt-% NaCl solution

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