The effects of nickel and nitrogen on the microstructure and corrosion resistance of duplex stainless steel weldments

Miura, Masato; Koso, Masashi; Kudo, Takeo; Tsuge, Hiroyasu

doi:10.1080/09507119009447706

Cited by 24 publications

(8 citation statements)

References 2 publications

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“…It is also evident from literature that higher percentage of Ni in alloy 1 (7.06%) than that of alloy 2 (5.59%) results in promoting a greater concentration of ferrite stabilizer elements (Cr, Mo) in the remaining ferrite. This highly alloyed ferrite is more susceptible to the precipitation of sigma phase [25].…”

Section: Influence Of Alloying Elements On the Deformationmentioning

confidence: 99%

Crack Formation during Hot Rolling of Nitrogen Alloyed Duplex Stainless Steels

Subramanian¹,

Chandramohan²

2012

Materials and Manufacturing Processes

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Duplex stainless steel with varying nitrogen contents of 0.22% (alloy 1) and 0.18% (alloy 2) were produced using a conventional induction furnace under normal ambient atmosphere. The samples were subsequently rolled under hot (1,000-1,100 C) conditions to various thickness reductions (15-75%). Both the hot rolled alloy samples were examined for the changes in microstructure and mechanical properties. The alloy 1 with higher nitrogen content opens out while deforming above 15%, whereas the alloy 2 deformation in the hot working zone is perfect without any defects. The crack initiation parameter for the alloy 1 is the secondary phase formation in the austenite area, which is brittle. The temperature range of 1,050 to 1,100 C is not desirable for hot rolling of alloy 1 and the same temperature range is suitable for hot rolling of alloy 2.

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Section: Influence Of Alloying Elements On the Deformationmentioning

confidence: 99%

Crack Formation during Hot Rolling of Nitrogen Alloyed Duplex Stainless Steels

Subramanian¹,

Chandramohan²

2012

Materials and Manufacturing Processes

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“…Its greatest effect is to balance the microstructure to provide the proper ferrite/austenite ratio. It also affects the corrosion and mechanical properties as well as the formation of secondary particles because Ni stabilizes austenite [22,[36][37][38][39] 2) It is a strong austenite former. In fact, nitrogen is about 20 times more effective than…”

Section: Nimentioning

confidence: 99%

Final Report, Volume 1, Metallurgical Evaluation of Cast Duplex Stainless Steels and their Weldments

Wen¹

2005

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FOREWARD iv ABSTRACTDuplex stainless steels (DSS) are being specified for chloride containing environments due to their enhanced pitting and stress corrosion cracking resistance. They exhibit improved corrosion performance over the austenitic stainless steels. Duplex stainless steels also offer improved strength properties and are available in various wrought and cast forms. In the study, the corrosion performances of DSS castings were characterized and assessed, including the wrought counterparts for comparison. The evaluation filled the pore of lack of data for cast duplex stainless steels compared to wrought materials. A database of the pitting corrosion and IGC behavior of cast and wrought materials was generated for a greater depth of understanding for the behavior of cast duplex stainless steel. In addition, improved evaluation methods for DSS castings were developed according to ASTM A923, A262, G48 and A494.v The study revealed that when properly heat treated according to the specification, (1) DSS castings have equal or better pitting and intergranular corrosion resistance than their wrought counterparts; (2) Welding reduces the pitting and intergranular corrosion resistance for both the wrought and cast duplex alloys; (3) Castings generally have better toughness than their wrought counterparts in the temperature range of -80°C to +20°C; (4) All shield metal arc (SMA) test welds in DSS castings, with recommended or over matching filler metal, indicate that welding is not a significant factor when considering DSS applications.

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“…5,9 An appropriate balance between the ferrite and austenite structure of the base material is achieved by appropriate combination of the chemical composition and appropriate heat treatment. 10,11 However, the control of the weld joint structure balance is not so easy as for the base material, 6,12,13 especially if filler metal is not used. 14 The available studies show that the HAZ structure, the weld zone (WZ) structure, 15 and the geometry of the joint 16 depend mainly on heat input.…”

Section: Introductionmentioning

confidence: 99%

The effect of laser welding power on the properties of the joint made of 1.4462 duplex stainless steel

Sołtysiak

Giętka

Sołtysiak

2018

Advances in Mechanical Engineering

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The butt welding of 1.4462 (2205) duplex stainless steel plates with thickness of 4 mm under various welding parameters was achieved by Nd:YAG laser type without the use of the filler material. Welding parameters such as welding power (kW) and the focus distance from the joint surface (mm) were changed. The Ar 5.0 protective gas flow and welding speed were the same for all the tests and were 20 L/min and 0.5 m/min, respectively. The weld shape, weld macrostructure, microstructure, strength and hardness, and the content of the ferrite in the weld zone, heat-affected zone, and base metal were emphatically investigated. The test results showed that increase in laser power increases the weld zone area. For the weld samples, a better ferrite/austenite ratio was obtained by focusing the laser beam on the sheet surface. Furthermore, the largest elongation from strength test has been observed for the weld samples made with laser power of 2.0 kW.

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The effects of nickel and nitrogen on the microstructure and corrosion resistance of duplex stainless steel weldments

Cited by 24 publications

References 2 publications

Crack Formation during Hot Rolling of Nitrogen Alloyed Duplex Stainless Steels

Crack Formation during Hot Rolling of Nitrogen Alloyed Duplex Stainless Steels

Final Report, Volume 1, Metallurgical Evaluation of Cast Duplex Stainless Steels and their Weldments

The effect of laser welding power on the properties of the joint made of 1.4462 duplex stainless steel

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