scholarly journals Nitride Precipitation Behavior of High Nitrogen-bearing Stainless Steel HAZ and its Corrosion Resistance. Study on Properties of Welded Joints for High Nitrogen bearing Stainless Steels. 2nd report.

2002 ◽  
Vol 20 (1) ◽  
pp. 106-113 ◽  
Author(s):  
Makoto OGAWA ◽  
Kazuo HIRAOKA ◽  
Yasuyuki KATADA ◽  
Masayuki SAGARA ◽  
Susumu TSUKAMOTO ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Welded Joints ◽  
Precipitation Behavior ◽  
High Nitrogen ◽  
Nitride Precipitation

scholarly journals Corrosion Resistance of TIG Welded Joints of Stainless Steels

2017 ◽  
Vol 885 ◽  
pp. 190-195 ◽  
Author(s):  
Amanda Silveira Alcantara ◽  
Enikő Réka Fábián ◽  
Monika Furkó ◽  
Éva Fazakas ◽  
János Dobránszky ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Ferric Chloride ◽  
Stainless Steels ◽  
Welded Joints ◽  
Welding Process ◽  
Inert Gas ◽  
Tungsten Inert Gas Welding ◽  
Type Stainless Steel ◽  
Different Types

The aim of this work was to analyze the performance of joints made by TIG (Tungsten Inert Gas) welding process in austenitic and duplex stainless steels with special regards to their corrosion resistance. Three different types of stainless steel were butt welded with TIG method. Ferric-chloride test and electrochemical treatments revealed how does the TIG process affects the corrosion resistance depending upon the alloy used for welding the joint. This work focuses on the weldability of the 2304, 2404 and 304 type stainless steel heterogeneous welds.

Development of Powder Metallurgy High Nitrogen Stainless Steel

2010 ◽  
Vol 638-642 ◽  
pp. 1811-1816 ◽  
Author(s):  
Chun Jiang Kuang ◽  
H. Zhong ◽  
D. Chen ◽  
X. Kuang ◽  
Q. Li ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Nitrogen Content ◽  
Stainless Steels ◽  
High Strength ◽  
Gas Atomization ◽  
High Nitrogen ◽  
Annealed State ◽  
Nitrogen Alloying ◽  
High Nitrogen Stainless Steel

Nitrogen alloying in steel may greatly increase the strength and corrosion resistance of the material. This paper introduced some research results of high nitrogen stainless steel (HNS) investigation via PM process. Nickel free high nitrogen stainless steels (17Cr12Mn2MoN) and superaustenitic high nitrogen stainless steels (28Cr6Mn2/6Mo10/20NiN) were investigated via gas atomization and HIP processes. Nitrogen alloying behavior during atomization and consolidation processes was investigated. Powders with nitrogen content up to 1% were manufactured by gas atomization process. Nickel free high nitrogen stainless steels with nitrogen up to 0.6% exhibits high strength and ductility at as-HIPed and solution annealed state, and superaustenitic HNS with nitrogen content up to 1% showed very high strength and good ductility at solution annealed state, with b at 1100 MPa, s at 810 MPa and elongation of 43%. PM HNS exhibited excellent corrosion resistance.

scholarly journals Chromium Nitride Precipitation Behavior in Weld Heat-affected Zone of High Nitrogen Stainless Steel.

2002 ◽  
Vol 42 (12) ◽  
pp. 1391-1398 ◽  
Author(s):  
Makoto Ogawa ◽  
Kazuo Hiraoka ◽  
Yasuyuki Katada ◽  
Masayuki Sagara ◽  
Susumu Tsukamoto
Keyword(s):  
Stainless Steel ◽  
Heat Affected Zone ◽  
Chromium Nitride ◽  
Precipitation Behavior ◽  
High Nitrogen ◽  
High Nitrogen Stainless Steel ◽  
Nitride Precipitation ◽  
Weld Heat

Grain Boundary Engineering of High-Nitrogen Austenitic Stainless Steel

2007 ◽  
Vol 539-543 ◽  
pp. 4962-4967 ◽  
Author(s):  
Hiroyuki Kokawa ◽  
W.Z. Jin ◽  
Zhan Jie Wang ◽  
M. Michiuchi ◽  
Yutaka S. Sato ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Grain Boundary ◽  
Thermomechanical Processing ◽  
Grain Boundary Engineering ◽  
High Nitrogen ◽  
Mechanical Properties And Corrosion ◽  
Nitride Precipitation

Large amount of nitrogen addition into an austenitic stainless steel can improve the mechanical properties and corrosion resistance remarkably as far as the nitrogen is in solid solution. However, once the nitrogen precipitates as nitride, it results in deteriorations in the properties of the high nitrogen austenitic stain steel. During welding, a high nitrogen austenitic stainless steel is ready to precipitate rapidly immense amounts of chromium nitride in the heat affected zone (HAZ), as intergranular or cellular morphologies at or from grain boundaries into grain interiors. The nitride precipitation reduces seriously the local mechanical properties and corrosion resistance. The present authors have demonstrated that a thermomechanical-processing as grain boundary engineering (GBE) inhibited intergranular chromium carbide precipitation in the HAZ of a type 304 austenitic stainless steel during welding and improved the intergranular corrosion resistance drastically. In the present study, the thermomechanical-processing was applied to a high nitrogen austenitic stainless steel containing 1 mass% nitrogen to suppress the nitride precipitation at or from grain boundaries in the HAZ during welding by GBE. GBE increases the frequency of coincidence site lattice (CSL) boundaries in the material so as to improve the intergranular properties, because of strong resistance of CSL boundaries to intergranular deteriorations. The optimum parameters in the thermomechanical-processing brought a very high frequency of CSL boundaries in the high nitrogen austenitic stainless steel. The GBE suppressed the intergranular and cellular nitride precipitation in the HAZ of the high nitrogen austenitic stainless steel during welding.

A review of progress on high nitrogen austenitic stainless-steel research

2021 ◽  
Vol 11 (12) ◽  
pp. 1901-1925
Author(s):  
Shuai Li ◽  
Chengsong Zhang ◽  
Jiping Lu ◽  
Ruiduo Chen ◽  
Dazhi Chen ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Research Progress ◽  
High Nitrogen ◽  
Friction Stir ◽  
The Past ◽  
Wide Range

High nitrogen austenitic stainless steels are commonly used in wide range of applications because of their excellent properties, attracting super attention over the past decades. Compared with other metal materials, high nitrogen austenitic stainless steel increases the nitrogen content under the premise that the structure is austenite, giving it excellent mechanical properties and corrosion resistance. Based on relevant documents from the past ten years, this article summarizes and compares three preparation methods for high nitrogen austenitic stainless steels, namely: powder nitriding, melt nitriding and bulk nitriding. They can be divided into six categories according to other differences as explained by the latest research progress on strengthening and toughening mechanism for high nitrogen austenitic stainless steels: composite structure strengthening, fine grain strengthening, precipitation strengthening and strain strengthening. This article also reviews the research progress on excellent properties of high nitrogen stainless steel, including strength, hardness and corrosion resistance. It further describes the emerging nickel-free high nitrogen austenitic stainless steels and its biocompatibility. Welding applications of high nitrogen austenitic stainless steels are also described from three aspects: friction stir welding, arc welding and brass solder. Finally, this article puts forward the development direction of high nitrogen austenitic stainless steels in the future.

scholarly journals CHARACTERIZATION OF CHROMIUM NITRIDE PRECIPITATION IN THE HEAT AFFECTED ZONE OF THE SUPERDUPLEX STAINLESS STEEL UNS S32750: AN EXPERIMENTAL AND NUMERICAL ANALYSIS

2021 ◽  
Vol 27 (2) ◽  
pp. 57-62
Author(s):  
PAOLO FERRO ◽  
Alberto Fabrizi ◽  
Franco Bonollo ◽  
Jan-Olof Nilsson
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Heat Affected Zone ◽  
Chromium Nitride ◽  
Chromium Nitrides ◽  
Pitting Corrosion Resistance ◽  
Superduplex Stainless Steel ◽  
Nitride Precipitation

It is well known that pitting corrosion resistance of duplex and superduplex stainless steels strongly depends on microstructural characteristics such as ferrite/austenite proportion, presence of intermetallic phases and elemental partitioning between the austenite and ferrite phases. In particular, during the welding operation, very fine chromium nitrides may precipitate within ferrite grains of the heat affected zone drastically reducing the corrosion resistance of welded joints of duplex and super duplex stainless steels. However, due to their small size and low distribution, analyzing the chemical composition and crystallography of chromium nitrides is quite difficult and only a restricted number of advanced techniques of investigation may discriminate their signal from the surrounding matrix. This work is aimed at supporting the microstructural characterization of a welded joint of a superduplex stainless steel by means of a field-emission gun scanning electron microscope. Sub-micron chromium nitride precipitates, identified within the ferritic grains of the heat affected zone, are recognized to be the main reason for the reduced pitting corrosion resistance of the analyzed welded joints. The results are supported by a multi-pass welding process numerical simulation aimed at estimating the cooling rates promoting chromium nitride precipitation in the heat affected zone. 

Appraisal about Stainless Steels for Piercing Jewelry

2011 ◽  
Vol 399-401 ◽  
pp. 1540-1546 ◽  
Author(s):  
Jun Ping Yuan ◽  
Wei Li ◽  
Chang Wang ◽  
Chun Yu Ma
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Surface Treatment ◽  
Stainless Steels ◽  
Development Trend ◽  
High Nitrogen ◽  
Nickel Allergy ◽  
Excellent Corrosion Resistance ◽  
New Development

This paper introduced several conventional stainless steels for piercing jewelry, and discussed their corrosion resistance, nickel allergy problem and risk of piercing infection. The authors proposed that several requirements should be taken into consideration in developing stainless steel materials for piercing jewelry, including corrosion resistance, safety, anti-bacterial, castability, workability, weldability, surface treatment property, and etc. High nitrogen and nickel free or low nickel stainless steels with anti-bacterial performance, which had many unique characteristics such as excellent corrosion resistance, no nickel allergy and less risk of piercing infection, would become a new development trend of stainless steels for piercing jewelry.

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