Enhancing mechanical properties of a low-carbon microalloyed cast steel by controlled heat treatment

Zhao, Jingwei; Lee, Jeong Hun; Kim, Young Kook; Jiang, Zhengyi; Lee, Chong Soo

doi:10.1016/j.msea.2012.08.122

Cited by 50 publications

(25 citation statements)

References 21 publications

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“…11d). Based on the chemical compositions given in Table 1 and the previous work [4], these particles are probably complex Ti, Nb and V carbides/nitrides (carbonitrides).…”

Section: Discussionmentioning

confidence: 79%

“…Fine precipitates effectively inhibit autenite growth during reheating, and the more stable the precipitates, the more effectively grain growth is inhibited to higher temperatures [4,24]. W is a strong carbide-forming element.…”

Section: Discussionmentioning

confidence: 99%

“…Several aspects of microalloyed steels, including heat treatment [4], phase transformation [5,6], mechanical properties [7,8] and oxidation behaviours [9], have been studied over the past decades.…”

Section: Introductionmentioning

confidence: 99%

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Effects of tungsten on continuous cooling transformation characteristics of microalloyed steels

et al. 2013

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Continuous cooling transformation (CCT) characteristics of microalloyed steels with different tungsten (W) contents (0, 0.1 and 1. wt.%) were investigated to obtain the necessary information for heat treatment of these steels. The effects of W addition on the sizes of prior austenite grains and precipitates were analysed. CCT diagrams were obtained by varying the cooling rates from 0.1 to 120. °C/s. Transformation characteristics were determined by using dilatometer test, microscopic observation and hardness measurement. The results showed that W had a positive effect on the refinement of prior austenite grains and precipitates. The CCT diagrams exhibited that the ranges of transformation products were shifted to the right side of the diagram when the W content increased. CCT diagram for steel with 0.1% W was similar in shape to that without W. The addition of 1% W induced two separated transformation ranges in the cooling rate range of 0.1 to 1. °C/s in the diagram. Both the austenitisation starting and finishing temperatures were raised as W was added. W addition induced decreased critical cooling rates for phase transformations and obtaining complete ferrite + pearlite microstructures. The martensite transformation temperature was decreased after W addition. The addition of W caused increased hardness, and the hardness obeyed an exponential type relationship with cooling rate. contents (0, 0.1 and 1 wt.%) were investigated to obtain the necessary information for heat treatment of these steels. The effects of W addition on the sizes of prior austenite grains and precipitates were analysed. CCT diagrams were obtained by varying the cooling rates from 0.1 to 120℃/s. Transformation characteristics were determined by using dilatometer test, microscopic observation and hardness measurement. The results showed that W had a positive effect on the refinement of prior austenite grains and precipitates. The CCT diagrams exhibited that the ranges of transformation products were shifted to the right side of the diagram when the W content increased. CCT diagram for steel with 0.1% W was similar in shape to that without W.The addition of 1% W induced two separated transformation ranges in the cooling rate range of 0.1 to 1℃/s in the diagram. Both the austenitisation starting and finishing temperatures were raised as W was added. W addition induced decreased critical cooling rates for phase transformations and obtaining complete ferrite+pearlite microstructures. The martensite transformation temperature was decreased after W addition.The addition of W caused increased hardness, and the hardness obeyed an exponential type relationship with cooling rate.

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“…11d). Based on the chemical compositions given in Table 1 and the previous work [4], these particles are probably complex Ti, Nb and V carbides/nitrides (carbonitrides).…”

Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

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Effects of tungsten on continuous cooling transformation characteristics of microalloyed steels

et al. 2013

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“…Additional EDS analysis shows that the rectangular particles contain Ti, Nb, and V, while only Ti and Nb are found in the irregular particles, as shown in Figures 6(b) and (c). Based on the chemical compositions given in Table I and prior study, [5,29,30] the precipitates are probably Ti, Nb, and V carbides or carbonitrides. Moreover, because of the presence of the 3514-VOLUME 44A, AUGUST 2013Cu grid while making extraction replica specimens, both spectra show high Cu peaks.…”

Section: Resultsmentioning

confidence: 92%

“…[2,3] In microalloyed steels, the addition of a small amount of alloying elements such as titanium (Ti), niobium (Nb), or vanadium (V) offers an important cost-effective approach to obtain a good combination of excellent toughness and strength through grain size control and precipitation hardening. [4][5][6][7] A variety of microstructures in microalloyed steels can be obtained depending on the chemical composition and manufacturing procedures. Studies on the microstructure of microalloyed steels with a view to improving their mechanical properties had been conducted by many researchers.…”

Section: Jingwei Zhao Taekyung Lee Jeong Hun Lee Zhengyi Jiang Anmentioning

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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Vanadium Microalloyed 0.25 C Cast Steels Showing As-Forged Levels of Strength and Ductility

Kostryzhev

Morales-Cruz

Zuno-Silva

et al. 2016

steel research int.

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Application of cast steels instead of hot forged or rolled ones will significantly decrease manufacturing costs and the final product price. However, low levels of mechanical properties in cast steels, especially ductility, can slow down the substitution of forged and rolled steels with the cast. In the present work, the authors study the effect of 0.01-0.12 wt% vanadium additions on the microstructure and mechanical properties of 0.25 wt% C cast steels. The yield stress, ultimate tensile strength, and elongation to failure in the studied cast steels are 730-750 MPa, 955-1002 MPa, and 12.3-21.5%, respectively, which correspond to those in hot forged and rolled steels with similar compositions. So, high property values in the 0.25 wt% C cast steels are shown here for the first time. The simultaneous increase in strength and ductility with an increase in V content follow a decrease in pearlite fraction, interlamellar spacing, and average pearlite area size; an increase in amount of degenerated pearlite; an increase in V-rich particle volume fraction and number density in ferrite and pearlite; the occurrence of interphase precipitation (in 0.12 wt% V steel), and an increase in dislocation density in ferrite and pearlite.

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Enhancing mechanical properties of a low-carbon microalloyed cast steel by controlled heat treatment

Cited by 50 publications

References 21 publications

Effects of tungsten on continuous cooling transformation characteristics of microalloyed steels

Effects of tungsten on continuous cooling transformation characteristics of microalloyed steels

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

Vanadium Microalloyed 0.25 C Cast Steels Showing As-Forged Levels of Strength and Ductility

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