Role of Nb in low interstitial 13Cr super martensitic stainless steel

Ma, Xiaoping; Wang, L.J.; Liu, C.M.; Subramanian, S.V.

doi:10.1016/j.msea.2011.05.065

Cited by 54 publications

(25 citation statements)

References 11 publications

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“…The resulting microstructure after double tempering consists of low-carbon martensite and finely dispersed austenite that is retained at room temperature. [5,6] It is well known that the stability of austenite depends on the concentrations of austenite-stabilizing elements in the phase, [5][6][7][8] which are mainly Ni [9][10][11][12] and Mn [13] in SMSS. This is critically dependent on the microstructural evolution during the annealing steps.…”

Section: Introductionmentioning

confidence: 99%

Austenite Formation from Martensite in a 13Cr6Ni2Mo Supermartensitic Stainless Steel

Bojack

Zhao

Morris

et al. 2016

Metall Mater Trans A

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The influence of austenitization treatment of a 13Cr6Ni2Mo supermartensitic stainless steel (X2CrNiMoV13-5-2) on austenite formation during reheating and on the fraction of austenite retained after tempering treatment is measured and analyzed. The results show the formation of austenite in two stages. This is probably due to inhomogeneous distribution of the austenite-stabilizing elements Ni and Mn, resulting from their slow diffusion from martensite into austenite and carbide and nitride dissolution during the second, higher temperature, stage. A better homogenization of the material causes an increase in the transformation temperatures for the martensite-to-austenite transformation and a lower retained austenite fraction with less variability after tempering. Furthermore, the martensite-to-austenite transformation was found to be incomplete at the target temperature of 1223 K (950°C), which is influenced by the previous austenitization treatment and the heating rate. The activation energy for martensite-to-austenite transformation was determined by a modified Kissinger equation to be approximately 400 and 500 kJ/mol for the first and the second stages of transformation, respectively. Both values are much higher than the activation energy found during isothermal treatment in a previous study and are believed to be effective activation energies comprising the activation energies of both mechanisms involved, i.e., nucleation and growth.

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Section: Introductionmentioning

confidence: 99%

Austenite Formation from Martensite in a 13Cr6Ni2Mo Supermartensitic Stainless Steel

Bojack

Zhao

Morris

et al. 2016

Metall Mater Trans A

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“…During the past 20 years much work has been done to characterize and optimize the microstructure and thus the mechanical behavior of low carbon martensitic stainless M A T E R I A L S C H A R A C T E R I Z A T I O N 7 1 ( 2 0 1 2 ) 7 7 -8 6 steels and SMSS [6][7][8][9][10][11]. To analyze the evolution of phase fractions, most of these studies used ex-situ techniques [6,9], besides dilatometry [7,8,10,11] or high temperature X-ray diffraction (XRD) [7] for in-situ analysis.…”

Section: Introductionmentioning

confidence: 99%

“…To analyze the evolution of phase fractions, most of these studies used ex-situ techniques [6,9], besides dilatometry [7,8,10,11] or high temperature X-ray diffraction (XRD) [7] for in-situ analysis. Dilatometry is a well-known and convenient technique, where phase fractions and transformation temperatures can be obtained from the dilatation of the sample [12].…”

Section: Introductionmentioning

confidence: 99%

In-situ determination of austenite and martensite formation in 13Cr6Ni2Mo supermartensitic stainless steel

Bojack

Zhao

Morris

et al. 2012

Materials Characterization

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“…In the oil and gas industry, super matensitic steels have been used primarily in the manufacture of seamless steel pipe for use in drilling oil and gas [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Molybdenum is added to improve corrosion resistance of steel, while Ni is added to stabilize austenite (γ) at elevated temperatures while avoiding the formation of δ-ferrite. Levels of carbon (C) reduced to 0.01% (w/w) contribute to improve the weldability [9,10,[12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistance of rolled and rerolled super martensitic steel in media containing chlorides and hydrogen sulfide

Soares

Lins

2017

Matéria (Rio J.)

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In the oil and gas industry, super matensitic steels have been used primarily in the manufacture of seamless steel pipe for use in drilling oil and gas. The objective of this work is to evaluate the corrosion resistance of rolled and rerolled super martensitic steels in electrolytes of aqueous solution of NaCl 35 g/L, and aqueous solution of NaCl 120 g/L, sodium acetate 0.4 g/L, with pH 4.5 (standard solution), saturated and unsaturated with H 2 S, simulating the service conditions of petroleum industry in the pre-salt operation. For this evaluation, the electrochemical tests used are electrochemical impedance spectroscopy (EIS) and cyclic polarization test. The characterization techniques used are optical microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The effect of H 2 S saturation of the solutions studied on the corrosion resistance of steels was detrimental. The super martensitic steel in the rerolled condition showed a higher corrosion resistance than the rolled steel in an aqueous solution of 35 g/L NaCl and in a standard solution saturated with H 2 S. In the 35 g/L NaCl aqueous solution saturated with H 2 S and in the standard solution, the rolled steel showed a higher corrosion resistance than the rerolled steel. In an aqueous solution of 35 g/L NaCl, the rolled and rerolled steels showed pitting diameter of 140μm and 100μm, respectively.

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Role of Nb in low interstitial 13Cr super martensitic stainless steel

Cited by 54 publications

References 11 publications

Austenite Formation from Martensite in a 13Cr6Ni2Mo Supermartensitic Stainless Steel

Austenite Formation from Martensite in a 13Cr6Ni2Mo Supermartensitic Stainless Steel

In-situ determination of austenite and martensite formation in 13Cr6Ni2Mo supermartensitic stainless steel

Corrosion resistance of rolled and rerolled super martensitic steel in media containing chlorides and hydrogen sulfide

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