Effects of tungsten on continuous cooling transformation characteristics of microalloyed steels

Zhao, Jingwei; Jiang, Zhengyi; Kim, Ji Soo; Lee, Chong Soo

doi:10.1016/j.matdes.2013.01.056

Cited by 16 publications

(10 citation statements)

References 23 publications

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“…For microalloyed steels however, only limited published work is available with regard to W alloying in them. Our previous studies have indicated that W addition in microalloyed steels changes the phase transformation characteristics [2] and influences the microstructural evolution behaviour [3,14]. The addition of proper amount of W is beneficial for the improvement of room/low temperature tensile strength and ductility of microalloyed steels [15].…”

Section: Introductionmentioning

confidence: 99%

“…The addition of alloying elements in microalloyed steels plays a key role in the grain size refining and precipitation hardening [1]. Microalloyed steels offer increased excellent mechanical properties at a moderate increase in price over carbon steels, and they are economical for a variety of applications such as cars, trucks, bridges, oil and gas extraction, construction equipment, off-highway vehicles, mining equipment and other heavy-duty structures [2,3]. Microalloyed steels have been developing rapidly over the past several years, and extensive investigations have been conducted with a view of improving the toughness and strength in order to meet the requirement of excellent mechanical properties for various practical applications [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Effects of tungsten on the hydrogen embrittlement behaviour of microalloyed steels

2014

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The effects of tungsten (W) additions (0, 0.1, 0.5 and 1 wt.%) on the hydrogen embrittlement behaviour of microalloyed steels were systematically investigated by means of slow strain rate tests on circumferentially notched cylindrical specimens, and the mechanism of hydrogen-induced embrittlement was discussed. W addition is found to increase the activation energy of hydrogen desorption. Microstructural features affect the hydrogen embrittlement behaviour and fracture modes of microalloyed steels. It is suggested that the hydrogen-induced embrittlement in the studied microalloyed steels with different W additions is caused by the combined effects of decohesion and internal pressure in the presence of hydrogen.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of tungsten on the hydrogen embrittlement behaviour of microalloyed steels

2014

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“…2 [2]. The specimen contracts during heating although the increase of temperature as a result of the microstructure rearrangement during phase transformation [31]. From this curve in Fig.…”

Section: Characterisation Of the Microalloyed Steelmentioning

confidence: 93%

Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale

Jiang

Zhao

et al. 2014

Corrosion Science

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Q. (2014). Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale. Corrosion Science, Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale AbstractThe formation mechanism of tight oxide scale on the microalloyed steel was investigated at temperatures of 550-850 °C in dry air. Microstructural characterisations reveal that the spallation of oxide scale dominates at the centre of coarse grains on the oxidation initiation. The fine-grained steel improves the adhesive properties of oxide scale by enhanced grain-boundary diffusion. The lower activation energy and higher oxidation rate accelerate cation/anion migration along grain boundaries, leading to high magnetite content in the oxide scale. The approach by grain refinement at initial oxidation has been proposed to generate the pickle-free tight oxide scale. Q. (2014). Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale. Corrosion Science, 85 115-125. AbstractThe formation mechanism of tight oxide scale on the microalloyed steel was investigated at temperatures of 550 to 850 C in dry air. Microstructural characterisations reveal that the spallation of oxide scale dominates at the centre of coarse grains on the oxidation initiation. The fine-grained steel improves the adhesive properties of oxide scale by enhanced grain-boundary diffusion. The lower activation energy and higher oxidation rate accelerate cation/anion migration along grain boundaries, leading to high magnetite content in the oxide scale. The approach by grain refinement at initial oxidation has been proposed to generate the pickle-free tight oxide scale.

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“…Fine precipitates effectively inhibit austenite growth, and the finer the precipitates, the more effectively the austenite grain growth is inhibited. [32,33] Therefore, W addition induces refined precipitates which play a role in the refinement of austenite grains, as shown in Figure 4.…”

Section: Characterization Of Precipitatesmentioning

confidence: 99%

Effects of Tungsten Addition on the Microstructure and Mechanical Properties of Microalloyed Forging Steels

Zhao

Lee

et al. 2013

Metall Mater Trans A

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In the current study, the effects of tungsten (W) addition on the microstructure, hardness, and room/low [223 K and 173 K (-50 C and -100 C)] temperature tensile properties of microalloyed forging steels were systematically investigated. Four kinds of steel specimens were produced by varying the W additions (0, 0.1, 0.5, and 1 wt pct). The microstructure showed that the addition of W does not have any noticeable effect on the amount of precipitates. The precipitates in W-containing steels were all rich in W, and the W concentration in the precipitates increased with the increasing W content. The mean sizes of both austenite grains and precipitates decreased with the increasing W content. When the W content was equal to or less than 0.5 pct, the addition of W favored the formation of allotriomorphic ferrite, which subsequently promoted the development of acicular ferrite in the microalloyed forging steels. The results of mechanical tests indicated that W plays an important role in increasing the hardness and tensile strength. When the testing temperature was decreased, the tensile strength showed an increasing trend. Both the yield strength and the ultimate tensile strength obeyed an Arrhenius type of relation with respect to temperature. When the temperature was decreased from 223 K to 173 K (from -50 C to -100 C), a ductile-to-brittle transition (DBT) of the specimen with 1 pct W occurred. The addition of W favored a higher DBT temperature. From the microstructural and mechanical test results, it is demonstrated that the addition of 0.5 pct W results in the best combination of excellent room/low-temperature tensile strength and ductility. 2013 The Minerals, Metals & Materials Society and ASM International. Effects of Tungsten Addition on the Microstructure and Mechanical Properties of Microalloyed Forging Steels JINGWEI ZHAO, TAEKYUNG LEE, JEONG HUN LEE, ZHENGYI JIANG, and CHONG SOO LEEIn the current study, the effects of tungsten (W) addition on the microstructure, hardness, and room/low [223 K and 173 K (À50°C and À100°C)] temperature tensile properties of microalloyed forging steels were systematically investigated. Four kinds of steel specimens were produced by varying the W additions (0, 0.1, 0.5, and 1 wt pct). The microstructure showed that the addition of W does not have any noticeable effect on the amount of precipitates. The precipitates in W-containing steels were all rich in W, and the W concentration in the precipitates increased with the increasing W content. The mean sizes of both austenite grains and precipitates decreased with the increasing W content. When the W content was equal to or less than 0.5 pct, the addition of W favored the formation of allotriomorphic ferrite, which subsequently promoted the development of acicular ferrite in the microalloyed forging steels. The results of mechanical tests indicated that W plays an important role in increasing the hardness and tensile strength. When the testing temperature was decreased, the tensile strength showed an increasing trend. Both...

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Effects of tungsten on continuous cooling transformation characteristics of microalloyed steels

Cited by 16 publications

References 23 publications

Effects of tungsten on the hydrogen embrittlement behaviour of microalloyed steels

Effects of tungsten on the hydrogen embrittlement behaviour of microalloyed steels

Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale

Effects of Tungsten Addition on the Microstructure and Mechanical Properties of Microalloyed Forging Steels

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