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Library

The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

May 29, 2020 by Mariano Iannuzzi

This investigation demonstrated 2.1 wt% tungsten drastically reduced the kinetics of tertiary phase precipitation in 25Cr super duplex stainless steels. The slow kinetics resulted in a better overall pitting corrosion resistance.

Filed Under: Corrosion Resistant Alloys, Critical potentials, Journal Articles, Library, Localized corrosion, Oil & Gas, Physical Metallurgy, Stainless steels, Temperature, Uncategorized Tagged With: chi phase, Oil&Gas, pitting corrosion, sigma phase, super duplex stainless steels

Hydrogen-Induced Stress Cracking of Swaged Super Duplex Stainless Steel Subsea Components

August 1, 2019 by Mariano Iannuzzi

HISC is the Achilles’ heel of duplex and super duplex stainless steels. In this investigation, we demonstrate the detrimental effects of both cold work (swaging) and anisotropic microstructures on HISC resistance. We believe the findings challenge the validity of the present form of DNV-GL RP F112 as a method to reduce HISC risks.

Filed Under: Environmentally Assisted Cracking, hisc, Hydrogen Embrittlement, Journal Articles, Physical Metallurgy Tagged With: hisc, hydrogen, hydrogen embrittlement, stainless steels, super duplex stainless steels

Effect of nickel on hydrogen permeation in ferritic/pearlitic low alloy steels – Publication.

April 26, 2018 by Mariano Iannuzzi

This is the first of a series of articles on the effect of nickel on the hydrogen embrittlement resistance of low alloy steels. In this paper, we investigated how nickel in solid solution in the ferrite phase affected hydrogen permeation.

Filed Under: Hydrogen Embrittlement, Journal Articles, Physical Metallurgy, Sulfide Stress Cracking Tagged With: hydrogen, hydrogen embrittlement, iso 15156, low alloy steels, permeation

Submerged arc welding (SAW) – Definition

January 16, 2018 by Mariano Iannuzzi

This post defines submerged arc welding process and includes a very instructive video that explains the process in detail.

Filed Under: Definitions, Manufacturing, Videos, Welding Tagged With: definition, nickel alloys, SAW, stainless steel, Submerged arc welding, welding

Unusual Correlation between SKPFM and Corrosion of Nickel Aluminum Bronzes – Publication

September 11, 2017 by Mariano Iannuzzi

In this article, we investigate the inverse correlation between Volta potentials measured by SKPFM and the observed localized corrosion morphology of NAB.

Filed Under: Journal Articles, Localized corrosion, Nickel aluminum bronze, Physical Metallurgy Tagged With: afm, atomic force microscopy, localized corrosion, marine corrosion, nab, nickel aluminum bronze, selective dissolution, skpfm, surface potential, Volta potential

Materials and corrosion trends in offshore and subsea oil and gas production – Publication

August 8, 2017 by Mariano Iannuzzi

In this article, we discuss materials and corrosion research topics that could have a transformative effect on the business. In particular, we discuss how scientists and engineers could push the boundaries of existing technologies, learning from the experience gained by other industries such as the nuclear, aerospace, and defense sectors.

Filed Under: Hydrogen Embrittlement, Journal Articles, Nickel Alloys, Stainless steels, Stress corrosion cracking, Sulfide Stress Cracking Tagged With: corrosion resistant alloys, hydrogen, Hydrogen Stress Cracking, localized corrosion, materials selection, nanoindentation, oil & gas, sour service

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