Effect of precipitation on hot formability of high nitrogen steels

Erişir, Ersoy; Prahl, Ulrich; Bleck, Wolfgang

doi:10.1016/j.msea.2010.09.045

Cited by 24 publications

(11 citation statements)

References 13 publications

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“…High‐nitrogen austenitic stainless steels (HNASS) own not only low cost but also excellent mechanical properties, corrosion resistance, oxidization resistance, wearability, etc . However, the precipitation of the second phases may occur in HNASS during thermal processes, welding, service at elevated temperatures, which will heavily damage various working, service properties of the steel . The precipitation behavior in HNASS is complex, depending on not only alloy composition but also treatment conditions before aging .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] However, the precipitation of the second phases may occur in HNASS during thermal processes, welding, service at elevated temperatures, which will heavily damage various working, service properties of the steel. [6][7][8][9][10][11][12][13][14] The precipitation behavior in HNASS is complex, depending on not only alloy composition but also treatment conditions before aging. [15][16][17][18] Our recent work [19,20] studied the precipitation behavior of Fe-18Cr-12Mn-0.48N HNASS after cold deformation by 30%.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe–18Cr–18Mn–0.63N High‐Nitrogen Austenitic Stainless Steel

Shi

et al. 2013

steel research int.

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Effects of different treatments (solid solution + cold deformation + aging condition) on the microstructure of Fe–18Cr–18Mn–0.63N high‐nitrogen austenitic stainless steel and consequently on its mechanical properties were investigated by microscopic observations and mechanical characterizations. For un‐cold‐deformed and 20% cold‐deformed steels, the results show that, all precipitates are Cr2N phase and the granular precipitates transform into cellular precipitates with increasing aging time. However, in 50% cold‐deformed steel only the granular and massive Cr2N precipitates. On the other hand, no cellular Cr2N precipitates are observed, but the precipitation of σ phase is induced. In un‐cold‐deformed steel, all tensile properties including the ultimate tensile strength, yield strength, and the elongation decrease with increasing aging time, resulting from the precipitation of the second phase. In the cold‐deformed steels, the tensile and yield strengths decrease while the elongations firstly increase and then decrease with aging time. Actually, in the cold‐deformed steels, the strain recovery or recrystallization mainly causes the decreases in tensile and yield strength in addition to increase in elongation after aged for 1 h. In contrast, the cellular Cr2N precipitation or granular precipitation mainly results in the continually slow decreases in tensile and yield strengths and the relevant decrease in elongation with aging.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe–18Cr–18Mn–0.63N High‐Nitrogen Austenitic Stainless Steel

Shi

et al. 2013

steel research int.

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“…Hot cracking has been considered to be a serious problem in the high temperature formability of high-nitrogen high-carbon steels [9]. It has been reported that the surface and edge cracks of ingots during hot forging or hot rolling are caused by the precipitation of carbide/nitride and intermetallic phases [9]. The precipitation of Cr 2 N has a detrimental effect on the formability of high-nitrogen steels [9].…”

Section: Thermodynamic Prediction Of Phases and Their Stabilitymentioning

confidence: 99%

“…High-nitrogen, high-carbon Fe-Cr-Mn-Ni stainless steels with high Cr contents are known to have thermal stability due to their high temperature oxidation and wear resistances [1,7]. The formation of Cr nitrides, however, is known to reduce fracture toughness and corrosion resistance at intermediate temperatures [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…However, the inhomogeneous distribution of various alloying elements and phases is known to aggravate the toughness, hot deformability, and fatigue resistance of the material. Furthermore, because of its intrinsic high temperature strength required for high temperature applications, the deformability of Fe-Cr-Mn-Ni austenite stainless steel is insufficient for forming defect-free parts and products using conventional deformation processing [7,9].…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Deformability of a Fe-Cr-Mn-Ni Austenite Stainless Steel with High Nitrogen and High Carbon Contents

Lee

Song

Hong

2018

Metals

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High temperature deformability and fracture behavior of deformation-processed high nitrogen high carbon Fe-Cr-Mn-Ni stainless steel rods were studied. The effective fracture elongation increased rapidly from 1000 °C, and reached high values (>45%) at 1100–1200 °C, accompanied by strain softening and stress serrations, supporting periodic dynamic recrystallization (DRX). Dynamically recrystallized grains were observed close to the fracture surface, suggesting that active DRX worked until its fracture. Pre-deformation-annealing of Fe-Cr-Mn-Ni stainless steel rods at 1200 °C was found to deteriorate in deformability above 1000 °C, while it enhanced ductility below 950 °C. Pre-deformation annealing had a negative effect on the deformability above 1000 °C due to the reduction of driving forces for DRX, but it exhibited a beneficial effect on the ductility at lower temperatures because of the ease of slip in large-grained structures. The fracture surface at 1250 °C exhibited intergranular fractures due to partial melting at grain boundaries, supported by the thermodynamic calculation of the solidus temperature of Fe-Cr-Mn-Ni austenite stainless steel. In this study, effective fracture elongation, defined based on the assumption that the effective gage length decreases with straining, was found to be an accurate measure of hot deformability.

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Effect of Cold Deformation on Microstructure and Mechanical Properties of a Fe–20Mn–19Cr–0.5C–0.6N High Nitrogen Austenitic Steel

Peng

Shi

Cui

et al. 2017

steel research int.

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The effect of cold deformation on microstructure and mechanical properties of a Fe–20Mn–19Cr–0.5C–0.6N high nitrogen austenitic steel has been studied. Microstructural observations show that the low cold deformation is fully dominated by the dislocation structures, namely, pile‐ups, Taylor lattice, and dislocation cells. With further cold deformation, the effect of twinning induced plasticity and grains fragmentation play an important role during cold deformation process. At critical cold deformation reduction range of 26–36%, the microstructural transitions by dislocation planar slip and multiplication gradually transits to twinning. For mechanical properties, with the increase of cold deformation reduction, the yield strength increases from 0.52 to 1.60 GPa, being increased by three times. The flow stress–strain model of the solution‐treated specimen can be described as . In addition, the strength‐elongation product and the cold deformation reduction present a linear relationship with a correlation coefficient of −0.27 to estimate the variation rate of the strength‐elongation product during cold deformation.

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Effect of precipitation on hot formability of high nitrogen steels

Cited by 24 publications

References 13 publications

Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe–18Cr–18Mn–0.63N High‐Nitrogen Austenitic Stainless Steel

Effects of Cold Deformation and Aging Process on Precipitation Behavior and Mechanical Properties of Fe–18Cr–18Mn–0.63N High‐Nitrogen Austenitic Stainless Steel

High-Temperature Deformability of a Fe-Cr-Mn-Ni Austenite Stainless Steel with High Nitrogen and High Carbon Contents

Effect of Cold Deformation on Microstructure and Mechanical Properties of a Fe–20Mn–19Cr–0.5C–0.6N High Nitrogen Austenitic Steel

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