Creep behavior and microstructure evolution at 750°C in a new precipitation-strengthened heat-resistant austenitic stainless steel

Jung, Woo-Sang

doi:10.1016/j.msea.2012.07.090

Cited by 48 publications

(8 citation statements)

References 28 publications

(48 reference statements)

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“…Recently, few investigations (Indrani et al 2011;Yang et al 2006;Li et al 2010;Bai et al 2013;Ha and Jung 2012) were carried out to understand the ageing behaviour of Super 304H alloy at high temperatures and evaluated the effect of varying Cu content on microstructure and mechanical properties of the alloy. Works carried out on weldability studies and high temperature properties of Super 304H weld joints reported the tendency of Super 304H to hot cracking and use of matching Super 304H filler metal as an alternate to Ni-based filler metal (Vekeman et al 2014;Kim et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Effect of filler addition on solidification behaviour and hot tensile properties of GTA-welded tube joints of Super 304H austenitic stainless steel

Kumar

Balasubramanian

Rao

2015

Int J Mech Mater Eng

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Background: Super 304H austenitic stainless steel tubes containing 2.3 to 3 (wt.%) of Cu are mainly used in superheaters and reheaters of ultra super critical boilers due their excellent corrosion and oxidation resistance. Cu addition causes precipitation strengthening effect by fine Cu-rich precipitates which evolve during creep conditions and results in increased creep strength. The microstructural evolution of stainless steels during welding significantly affects the material properties. Methods: In this work, solidification mode microstructure and hot tensile properties of autogenous and filler-added Super 304H gas tungsten arc (GTA) welded tube joints were correlated. Results: Autogenous welds of Super 304H solidified as austenite with 1.57 % delta ferrite and intercellular (Fe,Cr) 23 (C,B) 6 borocarbides. In filler-added welds, the higher Ni equivalent and addition of carbide stabilizing elements (Nb,Mo) eliminated δ ferrite and segregation of B as borocarbides. Conclusions: The filler-added welds exhibited superior tensile strength than autogenous welds at both room and high temperature.

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Section: Introductionmentioning

confidence: 99%

Effect of filler addition on solidification behaviour and hot tensile properties of GTA-welded tube joints of Super 304H austenitic stainless steel

Kumar

Balasubramanian

Rao

2015

Int J Mech Mater Eng

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“…[18] Moreover, the increase in N content not only enhances the solid-solution strengthening of the matrix but also suppresses the coarsening of M 23 C 6 precipitates. [19] Ha and Jung [20] reported that the replacement of C by N in the carbonitrides results in nitrogenrich or pure nitride precipitates which are much more stable than the carbides during creep deformation at high temperatures. Thus, SP2215 has been developed successfully based on the multiphase strengthening mechanism.…”

Section: Introductionmentioning

confidence: 99%

Multiphase Strengthening of Nanosized Precipitates in a Cost‐Effective Austenitic Heat‐Resistant Steel

Zhang

Wang

et al. 2020

steel research int.

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A newly developed austenitic heat‐resistant steel Fe–22Cr–15Ni (SP2215) is aged at 700 °C for different times, which presents good mechanical properties. The stress rupture strength can be maintained at 78 MPa by extrapolating to 105 h at 700 °C. Transmission electron microscopy (TEM) analysis reveals the multiphase composites strengthening mechanism. Three types of precipitates, the coherent Cu‐rich particles, Nb‐rich carbonitrides and NbCrN phase, are found in the austenitic matrix. The fine Cu‐rich particles are the first to precipitate, most densely and homogeneously distributed, as is illustrated by atom probe tomography (APT). It is concluded that it is the multiphase nanoprecipitate strengthening and the high thermal stability of the precipitates that render the excellent mechanical properties at high temperature. With the significant advantages of high strength at 700 °C and cost‐effective, the novel austenitic heat‐resistant steel SP2215 is recommended to be a promising material for high‐efficiency superheaters/reheaters of ultra‐supercritical unit boiler at steam temperature from 620 to 650 °C.

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“…At present, there is still a gap between the ferritic heat-resistant steel and the advanced austenitic heatresistant steel in the heat-resistance temperature [9]. At the same time, the fuel of the thermal power unit contains sulfur, chlorine and other harmful substances, it forms sulfides, sulfates, chlorides and the like after burning, which causes high temperature corrosion on the materials [10], resulting in the frequent occurrence of boiler "four tubes" explosion accidents.…”

Section: Introductionmentioning

confidence: 99%

The influence of Cu content on high temperature corrosion behavior of heat - resistant molten salt steel

Zhang

Zhao

et al. 2019

Matéria (Rio J.)

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This work studies the high temperature corrosion behavior of new heat-resistant steel with salt coating method of 75%Na 2 SO 4 +25%NaCl coating on the steel surface at 700℃. The chemical composition of corrosion products and surface morphology of the corrosion layer were analyzed using X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and investigate the effect of Cu content on high temperature corrosion behavior of heat resistant steel. The results show that the thermal corrosion kinetics curve of tested steel follows the parabolic law and the surface is composed of Fe 2 O 3 and FeCr 2 O 4. The corrosion layer were divided into two layers, the outer layer was loose and porous while the inner layer was dense and continuous. The structure of the oxide film consists of various protective oxide films; with increasing of Cu content, the high-temperature corrosion resistance of heat-resistant steel was improved and the thickness of the corrosion layer was decreased which led to improving the bonding strength between the inner layer and the matrix. The results of EDS analysis shows that Cu elements can promote the outward diffusion of Cr elements to oxidation of the steel to form a Cr 2 O 3 protective oxide film for preventing the diffusion of chlorine elements, oxygen elements into the interior toward the steel with slow down the process of "activation oxidation", reduce the sensitivity of intergranular corrosion and achieve the function of protecting materials.

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Creep behavior and microstructure evolution at 750°C in a new precipitation-strengthened heat-resistant austenitic stainless steel

Cited by 48 publications

References 28 publications

Effect of filler addition on solidification behaviour and hot tensile properties of GTA-welded tube joints of Super 304H austenitic stainless steel

Effect of filler addition on solidification behaviour and hot tensile properties of GTA-welded tube joints of Super 304H austenitic stainless steel

Multiphase Strengthening of Nanosized Precipitates in a Cost‐Effective Austenitic Heat‐Resistant Steel

The influence of Cu content on high temperature corrosion behavior of heat - resistant molten salt steel

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