Effect of oxide scale on temperature-dependent interfacial heat transfer in hot stamping process

Hu, Ping; Li, Ying; Li, Ye; Liao, Zhengwei

doi:10.1016/j.jmatprotec.2013.03.010

Cited by 96 publications

(39 citation statements)

References 19 publications

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Section: Introductionsupporting

confidence: 92%

“…Turetta [5] plotted 22MnB5 steel cooling curves and demonstrated that the higher the contact pressure the higher the cooling rate is. Similar results were reported by several authors [11][12][13][14][15].It has been observed that most of the experimental apparatus and industrial processes operate with closure pressures higher than 10MPa. In this study, a die quenching experimental method, using low closing pressures and an aluminum flat die, was developed in order to simulate characteristic events of the hot stamping process.…”

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confidence: 90%

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An Experimental Method to Simulate the Hot Stamping Process

Olah¹,

Verran²,

Dutra³

2017

Tecnol. Metal. Mater. Min.

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In this study a new experimental method using low closing pressure and a flat aluminum die was developed in order to investigate the hot stamping process of a 22MnB5 steel grade. Initially, an experimental set up was developed and validated. Next, experiments were carried out to evaluate the behavior of this steel when subjected to quenching, using this experimental set up and different cooling conditions such as water, oil and air. Results were assessed by cooling curves, as well as by mechanical tests and metallographic analyzes. Cooling rates close to 110 o C/s, hardness up to 480HV and ultimate tensile strength up to 1600 MPa were achieved, which are considered acceptable values for this steel in normal conditions of hot stamping. Keywords: Hot stamping; 22MnB5 steel; Quenching; Cooling rate. UM MÉTODO EXPERIMENTAL PARA SIMULAR O PROCESSO DE ESTAMPAGEM A QUENTE ResumoNesta pesquisa foi desenvolvido um novo método experimental, utilizando baixa pressão de fechamento e uma matriz plana de alumínio, com o objetivo de investigar o processo de estampagem a quente do aço 22MnB5. Inicialmente um aparato experimental foi desenvolvido e validado. A seguir foram realizados experimentos com o objetivo de avaliar o comportamento deste aço quando submetido a diferentes meios de têmpera, usando este método e diferentes condições de resfriamento, tais como água, óleo e ar. Os resultados foram avaliados usando curvas de resfriamento, bem como ensaios mecânicos e análises metalográficas. Foram obtidas taxas de resfriamento próximas de 100 0 C/s, durezas acima de 480HV e limite de resistência acima de 1600 MPa, valores que são considerados aceitáveis para este aço em condições normais de estampagem a quente. Palavras-chave: Estampagem a quente; Aço 22MnB5; Têmpera; Taxa de resfriamento. INTRODUCTIONIn recent years the hot stamping process has been widely studied, generating significant technological advancement and allowing its use in the production of several components with excellent performance due to the combination of high mechanical properties with high dimensional accuracies.An important aspect in the hot stamping process is that sheet conformation occurs at elevated temperatures, where the mechanical strength of the material is significantly reduced. Thus, the load required to deform the sheet is very low, opening up the possibility of the use of less robust and cheaper equipment, which results in lower operating costs and investment. The stamping tools would also be less stiff and cheaper. The use of low stress for deformation also requires the evaluation of the thermal behavior because the material is hot formed and simultaneously quenched to room temperature, in order to obtain a component with good dimensional accuracy and high mechanical resistance [1]. The conditions involving contact between the tool and the blank and the closing pressure have a significant influence on the heat extraction coefficient, on the cooling rate and consequently, on the final properties of the component. In hot stamping the co...

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Section: Introductionsupporting

confidence: 92%

supporting

confidence: 90%

An Experimental Method to Simulate the Hot Stamping Process

Olah¹,

Verran²,

Dutra³

2017

Tecnol. Metal. Mater. Min.

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“…3, the pressure among them rapidly reaches to over 30MPa. Much heat energy transfers from the steel plate to the die and punch, as the boundary heat transfer coefficient is relative to the pressure [8]. The temperature variation at the position is significant, but the temperature variation at the position is smaller than that at the position , as shown in Fig.…”

Section: Temperature Of Toolsmentioning

confidence: 98%

Effect of Austenitization Temperature on Microstructure and Mechanical Properties of B1500HS Boron Steel in the Hot Stamping

Lin

Wang

2016

MATEC Web Conf.

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Abstract. In the paper, a typical part of B1500HS boron steel was formed using the hot stamping tools, and the effect of austenitization temperature on the microstructure and mechanical properties of B1500HS boron steel was studied. The results show that, the temperature of steel plate has a significant effect on the temperature of hot stamping tools, and the temperature of punch rises at a faster speed than that of die in the hot stamping process. The austenitization temperature has a significant effects on the size of martensite. The cooling rate of steel plate has a significant effect on the tensile strength when the austenitization temperature is 870 . The fracture of sample austenitized at 870 or 900 is the dimple, the fracture of sample austenitized at 930 or 960 is the mixture of quasicleavage and dimple.

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“…When the steel plate completely contacts with the surface of punch and die, as shown in Figure 6, the pressure among them rapidly reaches to over 30MPa. Much heat energy transfers from the steel plate to the die and punch, as the boundary heat transfer coefficient is relative to the pressure [21].…”

Section: Temperature Of Completely Austenitizationmentioning

confidence: 99%

Research on hot stamping for a typical part of B1500HS boron steel using experiment and numerical simulation methods

Tang

Lin

et al. 2016

MATEC Web Conf.

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Abstract. In the paper, a typical part of B1500HS boron steel was formed using the hot stamping tools, and the effect of austenitization temperature on the microstructure and mechanical properties of B1500HS steel was studied by the experiment and finite element methods. The results show that, the temperature of steel plate has a significant effect on the temperature of hot stamping tools, and the temperature of punch rises at a faster speed than that of die in the hot stamping process. The austenitization temperature and time both have significant effects on the size of martensite, but have not obvious effects on the hardness. The cooling rate of steel plate has a significant effect on the tensile strength when the austenitization temperature is 870. The fracture of sample austenitized at 870 or 900 is the dimple, the fracture of sample austenitized at 930 or 960 is the mixture of quasicleavage and dimple.

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Effect of oxide scale on temperature-dependent interfacial heat transfer in hot stamping process

Cited by 96 publications

References 19 publications

An Experimental Method to Simulate the Hot Stamping Process

An Experimental Method to Simulate the Hot Stamping Process

Effect of Austenitization Temperature on Microstructure and Mechanical Properties of B1500HS Boron Steel in the Hot Stamping

Research on hot stamping for a typical part of B1500HS boron steel using experiment and numerical simulation methods

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