Hot deformation behaviour and fracture of 10CrMoWNb ferritic–martensitic steel

Abstract:To better understand the tensile deformation and fracture behavior of 35CrMo steel during hot processing, uniaxial tensile tests at elevated temperatures and strain rates were performed. Effects of deformation condition on the flow behavior, strain rate sensitivity, microstructure transformation, and fracture characteristic were characterized and discussed. The results indicated that the flow stress was sensitive to the deformation condition, and fracture occurs immediately after the peak stress level is reached, especially when the temperature is low or the strain rate is high. The strain rate sensitivity increases with the deformation temperature, which indicates that formability could improve at high temperatures. Photographs showing both the fracture surfaces and the matrix near the fracture section indicated the ductile nature of the material. However, the fracture mechanisms varied according to the deformation condition, which influences the dynamic recrystallization (DRX) condition, and the DRX was accompanied by the formation of voids. For samples deformed at high temperatures or low strain rates, coalescence of numerous voids formed in the recrystallized grains is responsible for fracture, while at high strain rates or low temperatures, the grains rupture mainly by splitting because of cracks formed around the inclusions.

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“…To avoid defects, a good understanding of the cavitation behavior and the fracture mechanism for the 35CrMo steel is of paramount importance [2].…”

Section: Introductionmentioning

confidence: 99%

Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Xiao

Huang

Liu

et al. 2016

Metals

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“…1a we present a typical XRD plot measured for the (Cr 1 À x Fe x ) 2 Al system for x¼0. It refines with tetragonal space group I4/mmm (No.…”

Section: Resultsmentioning

confidence: 99%

“…One particular alloy system fairly wellstudied is that of Fe-Cr as these alloys find numerous applications in the production of corrosion-resistant stainless steels [1], nuclear reactor containment vessels [2], and corrosion protection coatings [3]. However, most of these studies have been confined to the Ferich part of the phase diagram since these compositions represent the operational range of most applications.…”

Section: Introductionmentioning

confidence: 99%

Importance of doping and frustration in itinerant Fe-doped Cr2Al

Susner

Parker

Sefat

2015

Journal of Magnetism and Magnetic Materials

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“…At a strain of 0.05, with an increase in the deformation temperature and a decrease in the strain rate, the flow stress gradually reduces. This can be explained by the fact that higher temperatures or lower strain rates can provide high dislocation mobility and promote the dislocation annihilation, nucleation, and the growth of new grains [14][15][16]. Moreover, when the strain rate is 1 s −1 , the flow curve appears to have a single peak and then tends to hold steady at 1050°C, which shows the characteristics of dynamic recrystallization (DRX) [17].…”

Section: Experimental Flow Curvesmentioning

confidence: 99%

Microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel during hot deformation

Zhang

Zou

Wei

et al. 2020

Mater. Res. Express

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The 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel has attracted considerable attention to high-temperature applications due to its favorable combination of creep and oxidation resistance. In this paper, the microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel is studied from the compression deformation data in the temperature range of 850°C-1050°C and the strain rate range of 0.01-1 s −1 . Experimental results demonstrate that higher temperatures and lower strain rates enhance the dynamic recrystallization (DRX) process with remarkable effectiveness. The main precipitates are proved as the AlN phases and the (Cr,Fe) 23 C 6 carbides during hot deformation. With an increase in the deformation temperature, the size of (Cr,Fe) 23 C 6 and AlN gradually increases, and volume fraction gradually decreases. When the strain rate decreases, the average size and volume fraction of (Cr,Fe) 23 C 6 and AlN gradually increase. At the lower temperatures, the occurrence of dynamic recrystallization (DRX) is strongly influenced by (Cr,Fe) 23 C 6 formed on the grain boundaries, mainly because it causes a pinning effect, which hinders the movement of dislocations and delays the occurrence of the DRX.

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Hot deformation behaviour and fracture of 10CrMoWNb ferritic–martensitic steel

Cited by 36 publications

References 56 publications

Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Hot Tensile and Fracture Behavior of 35CrMo Steel at Elevated Temperature and Strain Rate

Importance of doping and frustration in itinerant Fe-doped Cr2Al

Microstructural evolution and precipitation behavior of the 0.1C-18Cr-1Al-1Si ferritic heat-resistant stainless steel during hot deformation

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