Microalloying and a New Post Foring Treatment of Medium Carbon Steels

González‐Baquet, Ignacio; Kašpar, Radko; Richter, Johannes; Nussbaum, G.; Köthe, A.

doi:10.4028/www.scientific.net/msf.284-286.411

Cited by 14 publications

(13 citation statements)

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“…The application of microalloyed forging steels has often been limited based on toughness consideration at the required strength level [7]. In an effort to acquire excellent toughness, appropriate heat treatment is usually performed on the microalloyed steels after forging [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effects of tungsten addition and heat treatment conditions on microstructure and mechanical properties of microalloyed forging steels

Zhao

Jiang

Lee

2013

Materials Science and Engineering: A

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In the present work, the effects of tungsten (W) addition and heat treatment conditions on the microstructure, impact toughness and tensile properties of microalloyed forging steels were studied. Four kinds of microalloyed forging steels were produced by varying W additions (0, 0.5, 1 and 2 wt%). Heat treatment was carried out at temperatures ranging from 840 to 950 °C followed by air and furnace cooling. Mechanical tests were used to evaluate the room temperature Charpy impact and tensile properties. The resulting microstructures were analysed via optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the microstructure and mechanical properties of the microalloyed forging steels are closely related to the W content. Correct selection of heat treatment temperature and cooling method is very important to enhance the mechanical properties. The optimum heat treatment temperatures obtained in this study are 920, 900, 880 and 860 °C for the steels with 0%, 0.5%, 1% and 2% W, respectively. Both the impact toughness and tensile properties of the microalloyed forging steels have been significantly enhanced after heat treatment at the optimum temperatures followed by air cooling. AbstractIn the present work, the effects of tungsten (W) addition and heat treatment conditions on the microstructure, impact toughness and tensile properties of microalloyed forging steels were studied. Four kinds of microalloyed forging steels were produced by varying W additions (0, 0.5, 1 and 2 wt.%). Annealing treatment was carried out at temperatures ranging from 840 to 950℃ followed by air and furnace cooling. Mechanical tests were used to evaluate the room temperature Charpy impact and tensile properties. The resulting microstructures were analysed via optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results show that the addition of W plays an important role in increasing the strength and decreasing the toughness of the studied steels. Correct selection of annealing temperature and cooling method is very important to enhance the mechanical properties. The optimum annealing temperatures obtained in this study are 920, 900, 880 and 860℃ for the steels with 0, 0.5, 1 and 2% W, respectively. Both the impact toughness and tensile properties of the microalloyed forging steels have been significantly enhanced after heat treatment at the optimum temperatures followed by air cooling.

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Section: Introductionmentioning

confidence: 99%

Effects of tungsten addition and heat treatment conditions on microstructure and mechanical properties of microalloyed forging steels

Zhao

Jiang

Lee

2013

Materials Science and Engineering: A

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“…There is considerable energy stored in each of the microstructural units, like para-equilibrium cementite, bainite, and martensite. [16] Such a hard microstructure with a high stored energy is expected to provide high resistance to crack initiation (ϳ400 MPa endurance limit [5] ) but not to crack propagation, because even if a small flaw is created, then the system tries to release the stored energy suddenly through cleavage fracture. The microstructural features, which support the above arguments, are as follows: bainite has narrower laths than the martensite, and the fracture mode of the bainite is cleavage or quasi-cleavage.…”

Section: Discussionmentioning

confidence: 99%

“…It was reported that a decrease in the final deformation temperature led to a finer grain size (beneficial for toughness) and also promoted the formation of ferrite. [3,4,5] The present investigation forms a part of an attempt to improve the tensile properties and the fatigue resistance of the automotive grade microalloyed steel 38MnSiVS5 through thermomechanical processing to produce a F-B-M microstructure. [6][7][8][9] Here an attempt was made to optimize the parameters (finish forging temperature, quenching temperature, annealing temperature and time) of the TSCA treatment.…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic fracture toughness of a medium carbon microalloyed steel of three different microstructures

Sankaran

Malakondaiah

Gouthama

et al. 2006

Metall Mater Trans A

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A multiphase ferrite-bainite-martensite (F-B-M) microstructure was developed in an automotive grade V-bearing medium carbon microalloyed steel, 38MnSiVS5. It was characterized using optical, scanning, and transmission electron microscopy. The tensile, Charpy impact, and static and dynamic fracture toughness behaviors were evaluated. The results are compared with those of ferrite-pearlite (F-P) and tempered martensite (T-M) microstructures of the same steel. Although the tensile properties of the multiphase microstructures were superior, the Charpy impact and static and dynamic fracture toughness properties were inferior compared with those of the other two microstructures. The F-P condition displayed the highest plane strain fracture toughness value (K IC ), while the T-M condition was characterized by the highest dynamic fracture toughness (conditional) value (K IDQ ). The Charpy impact energy of the T-M condition was greater than that for the other two conditions. An examination of the surfaces of fractured samples revealed predominant ductile crack growth in the F-P microstructure and a mixed mode (ductile and brittle) crack growth in the T-M and the F-B-M microstructures. Although the Charpy impact energy, plane fracture toughness (K IC ), and conditional dynamic fracture toughness (K IDQ ) of the multiphase microstructure were inferior to those of the T-M and the F-P microstructures, the toughness properties were comparable to those of medium carbon low alloy steels having bainite-martensite (AISI 4340) or tempered martensite microstructures.

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“…Recently, a two-step cooling and annealing (TSCA) treatment following controlled forging was developed to produce multiphase (ferrite-bainite-martensite, F-B-M) microstructures that displayed tensile properties similar to those of Q&T steels. It was reported that a decrease in the final deformation temperature led to a finer grain size (beneficial for toughness) and also promoted the formation of ferrite , 1998Kaspar et al, 1997). As part of a detailed investigation to develop better fatigue resistant and cost effective MA steels through process control, the processing parameters of the TSCA treatment (finish forging temperature, quenching temperature, annealing temperature and time) were optimized to get the desired microstructure and tensile properties in the medium carbon microalloyed steel 38MnSiVS5 (Sankaran et al, 2003a).…”

Section: Introductionmentioning

confidence: 99%

Fatigue behavior of a multiphase medium carbon V-bearing microalloyed steel processed through two thermomechanical routes

Padmanabhan

Sankaran

2008

Journal of Materials Processing Technology

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Microalloying and a New Post Foring Treatment of Medium Carbon Steels

Cited by 14 publications

References 0 publications

Effects of tungsten addition and heat treatment conditions on microstructure and mechanical properties of microalloyed forging steels

Effects of tungsten addition and heat treatment conditions on microstructure and mechanical properties of microalloyed forging steels

Static and dynamic fracture toughness of a medium carbon microalloyed steel of three different microstructures

Fatigue behavior of a multiphase medium carbon V-bearing microalloyed steel processed through two thermomechanical routes

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