Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr–3.5Mo Super Ferritic Stainless Steels

Ma, L.; Han, Jian; Shen, Junqi; Hu, Shengsun

doi:10.1007/s40195-014-0070-2

Cited by 24 publications

(10 citation statements)

References 17 publications

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“…1. The results mean both steels can satisfy the requirements of intergranular corrosion resistance [18][19][20]. For N#, due to high Nb content, the stabilisation ratio is a little higher, which will also provide high strength during the design process of FSS.…”

Section: Methodsmentioning

confidence: 86%

Microstructure and Mechanical Properties of Nb- and Nb + Ti-Stabilised 18Cr–2Mo Ferritic Stainless Steels

Han

Zhu

Wei

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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To explore the optimum use of stabilised elements and study the influences of stabilisation in 18Cr-2Mo grades, the Nb and Nb + Ti microalloying investigation focused on the relationships of the microstructure and mechanical properties of the microalloyed 18Cr-2Mo ferritic stainless steel thick plates. Thermo-Calc calculation was performed to predict the equilibrium phase diagrams. Afterwards, the microstructure, i.e. grain size and precipitation, of as-annealed specimens was analysed by means of optical microscopy, scanning electron microscopy and transmission electron microscopy, X-ray diffraction and energydispersive spectroscopy. Also, electron backscatter diffraction mapping was constructed to characterise grain boundary. The mechanical properties, including tensile strength and impact toughness, were tested to correlate with the microstructure. The results show that the grain sizes of Nb-stabilised steel are comparatively smaller, which is related to the fine precipitation at the grain boundaries and beneficial to the impact toughness. The increase in its strength is not apparent due to the inhomogeneous grain sizes. The grain boundary characters are similar, which is not the main factor related to their mechanical properties. When Ti is added, TiN forms above the liquidus, and large TiN particles evidently impair impact toughness.

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Section: Methodsmentioning

confidence: 86%

Microstructure and Mechanical Properties of Nb- and Nb + Ti-Stabilised 18Cr–2Mo Ferritic Stainless Steels

Han

Zhu

Wei

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…for a high living standard (see Figure 1). The researchers are dedicating high effort to increase the strength to weight ratio by grain refinement through applying heat treatments [14][15][16][17][18][19][20], mechanical processing [21,22], and a combination of both i.e. thermomechanical processing (TMP) [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Plastic Deformation Behavior in Steels during Metal Forming Processes: A Review

Kumar¹,

Povoden-Karadeniz²

2021

Plastic Deformation in Materials [Working Title]

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The plastic deformation occurs in steels during metal forming processing such as rolling, forging, high-pressure torsion, etc. which modify mechanical properties of materials through the grain refinement, and the shape change of objects. Several phenomena in the scope of plastic deformation, such as hardening, recovery, and recrystallization are of great importance in designing thermomechanical processing. During the last decades, a focus of research groups has been devoted particularly to the field of metals processing of steel parts through plastic deformation combined with specific heat treatment conditions. In this review chapter, the current status of research work on the role of plastic deformation during manufacturing is illuminated.

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“…[24] Similarly, Ma et al increased the impact absorbed energy of the 26 Cr-3.5 Mo ferritic stainless steels from 3 to 42 J (at À40 C) with increasing Ni from 2 to 4 wt%. [25] The key reason for improved toughness by the addition of Ti, Mo, and V is different from that of Ni. The former three are strong forming element of carbides, and the formed carbides have high precipitation temperature, i.e., having a potential to precipitate at the austenitizing region.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, Ma et al. increased the impact absorbed energy of the 26 Cr–3.5 Mo ferritic stainless steels from 3 to 42 J (at −40 °C) with increasing Ni from 2 to 4 wt% . The key reason for improved toughness by the addition of Ti, Mo, and V is different from that of Ni.…”

Section: Introductionmentioning

confidence: 99%

Improved Toughness of a High‐Strength Low‐Alloy Steel for Arctic Ship by Ni and Mo Addition

et al. 2020

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The effect of Ni and Mo addition on the microstructures of a high strength low alloy (HSLA) steel under the thermo-mechanical control processing (TMCP) process is currently unknown, which is herein explored by transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). As the Ni increase from 0.6 to 0.9 wt%, the volume fraction of bainitic ferrite increase from 30% to 50%, the average size decrease from 3 to 2 μm, and the size of the martensiteaustenite (M-A) constituent decrease from 1.2 to 0.7 μm. The volume fraction of bainitic ferrite increases from 30% to 85%, and grain size increases from 3 to 5 μm with increasing Mo from 0 to 0.2 wt%. The size of M-A constituent decreases from 1.2 to 0.3 μm. Impact absorbed energy at À100 C increases from 50 to 70 J as the Ni increase from 0.6 to 0.9 wt%, which decreases from 50 to 10 J with increasing Mo from 0 to 0.2 wt%. The improved impact toughness mainly results from the decreasing size of the grain and the M-A constituent with the increase in Ni from 0.6 to 0.9 wt%.

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Effects of Microalloying and Heat-Treatment Temperature on the Toughness of 26Cr–3.5Mo Super Ferritic Stainless Steels

Cited by 24 publications

References 17 publications

Microstructure and Mechanical Properties of Nb- and Nb + Ti-Stabilised 18Cr–2Mo Ferritic Stainless Steels

Microstructure and Mechanical Properties of Nb- and Nb + Ti-Stabilised 18Cr–2Mo Ferritic Stainless Steels

Plastic Deformation Behavior in Steels during Metal Forming Processes: A Review

Improved Toughness of a High‐Strength Low‐Alloy Steel for Arctic Ship by Ni and Mo Addition

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