Effect of Tool Temperature on Microstructure and Properties of Tailored Hot Stamping Components

Zhang, Zhiqiang; Yu, Jianhao; Meng, Songfeng; Zhao, Yi; He, Dongye

doi:10.1007/s11665-018-3581-6

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…A threshold temperature of about 436 °C that leads to a homogeneous bainitic microstructure on the component is found. These results are in agreement with Tang et al [ 32 ] and Zang et al [ 33 ] who demonstrated that the tool temperature should be greater than 400 °C if a noticeable change in mechanical properties is desired on the ductile part of the component.…”

Section: Resultssupporting

confidence: 92%

“…FE results showed that the temperature of heated tools is the parameter that mainly affects the homogeneity of the bainitic microstructure, in agreement with the literature. [32,33] This result is confirmed by the metamodels in Figure 8, 9 related to the bainitic transformation as a function of process parameters. For reasons of simplification, results are shown only for ductile region III (Figure 1); however, it was verified that the results for both ductile regions are similar.…”

Section: Influence Of Process Parameterssupporting

confidence: 67%

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Analysis of Transition Zone on a Hot‐Stamped Part with Tailored Tool Tempering Approach by Numerical and Physical Simulation

Palmieri

Posa

Angelastro

et al. 2023

steel research int.

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The main goals of the transport industry are lightweight and the increase in safety for passengers. Consequently, the choice of materials is very important. The materials adopted in recent years are lightweight alloys, such as aluminum and magnesium alloys, carbon fiber-reinforced polymers, and advanced highstrength steel (AHSS). In the automotive industry, five classes of AHSS are distinguished: dual-phase steel (DP), complex phase steel (CP), transformationinduced plasticity steel (TRIP), martensitic steel (MART), and press-hardened steel (PHS). [1,2] DP steels are ferritic-martensitic phase steels, which exhibit a strength between 450 and 1400 MPa depending on the amount of martensite. [3] Complex phase steels contain bainitic, martensitic, and ferritic phases and show higher formability than DP ones. [1] TRIP steels are characterized by a certain amount of retained austenite phase, which transforms into the martensite phase during the deformation. This effect helps the distribution of the strain and increases elongation, justifying the greater formability of TRIP steels compared to CP and DP steels. [1,4] Martensitic steels have high strength levels but show very low formability. Finally, the press-hardened steels are typically carbonmanganese-boron alloyed steels, [5] which are generally adopted in the press hardening (PH) process where the unformed blank is heated in a furnace up to the complete austenitization temperature, formed in the hot condition and finally quenched in the die. These steels are typically delivered in ferritic-pearlitic conditions and have, at the end of the PH process, almost doubled resistance levels due to the transformation into the martensitic phase due to the quenching phase. Among the PHS, the most common one is the 22MnB5; [5] however, other steel grades with higher carbon content are recently proposed to be used in the PH process. [6][7][8] PHS combined with the PH process allow to satisfy at the same time the requirements related to safety and those related to vehicle weight reduction, [9] therefore they are increasingly adopted in anti-intrusion applications of automotive structures (bumpers, doors, bodies-in-white).Current innovation trends are aimed at opportunities these AHSS offer in terms of tailored mechanical properties. [10][11][12][13][14] Currently, the stamped part designing with customized performances includes forming technologies that use tailor rolled blanks, tailor welded blanks, patchwork blanks, tailor tool tempering, tailor heating, and tailor cooling process. [15] A great deal of research has been carried out around the tool tempering approach in recent years. [12,13,16] With this approach, the tailored properties are achieved by exploiting different cooling conditions during the

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Section: Resultssupporting

confidence: 92%

Section: Influence Of Process Parameterssupporting

confidence: 67%

Analysis of Transition Zone on a Hot‐Stamped Part with Tailored Tool Tempering Approach by Numerical and Physical Simulation

Palmieri

Posa

Angelastro

et al. 2023

steel research int.

View full text Add to dashboard Cite

show abstract

“…They achieved a hardness and ultimate tensile strength (UTS) of the energy absorption area that was reduced by 52% and 49%, respectively, compared with the anti-invasion area. Zhang et al [8] performed similar studies with die temperatures up to 500 °C and achieved hardness levels of 230 HV in the slow cooling zone and 470 HV in the quenching zone. Zhou et al [9] reported a UTS of approximately 916 MPa in the tailored region compared with a UTS of approximately 1411 MPa in the fully hardened region.…”

Section: Introductionmentioning

confidence: 93%

Study on Microstructure and Properties of Tailored Hot-Stamped U-shaped Parts Based on Temperature Field Control

Xiao

Zheng

et al. 2019

Metals

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In order to meet the needs of the automotive industry, it is necessary to produce “tailored” parts. The U-shaped die equipped with a high-speed airflow device was designed to conduct the hot stamping experiments. The microstructure, micro-hardness, tensile properties, and fracture behavior of the parts were analyzed. The experimental results showed that the quenched phase of the hardened section was mainly martensite, and the micro-hardness and tensile strength could reach 445 HV and 1454 MPa, respectively. The fracture mechanism was brittle fracture. For the toughness section, as the tool temperature increased from 300 to 600 °C, both micro-hardness and tensile strength decreased. Meanwhile, the area fractions of bainite and ferrite increased, and the area fraction of martensite reduced. The fracture behavior was plastic fracture.

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“…The frequent alternation of large-scale ambient temperature changes will inevitably affect the performance of spacecraft. Compared with satellites or manned spacecraft flying around the earth, the space environment faced by deep space exploration spacecraft and extraterrestrial resident platforms is more complex and harsher [2] .…”

Section: Introductionmentioning

confidence: 99%

Research on space temperature environmental performance and technology of aerospace RF cable assembly

Tong,

Li,

Zhao

et al. 2024

J. Phys.: Conf. Ser.

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The aerospace RF cable assembly is an important component for the propagation of space communication signals, which can achieve impedance matching and energy transmission of microwave signal transmission paths. In addition to the requirements for a wide frequency range, low insertion loss, and low standing wave as required for conventional RF cable components, it must also possess high reliability, spatial temperature resistance, vacuum high-power transmission, and other spatial adaptability capabilities. This article primarily discusses the damage to the insulation materials of cable components under space-limit temperatures and its impact on the performance of the cable components. The problem of deterioration and even failure of the performance of aerospace RF cable components in high and low-temperature alternating environments in space has been addressed through the adoption of corresponding measures.

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Effect of Tool Temperature on Microstructure and Properties of Tailored Hot Stamping Components

Cited by 7 publications

References 21 publications

Analysis of Transition Zone on a Hot‐Stamped Part with Tailored Tool Tempering Approach by Numerical and Physical Simulation

Analysis of Transition Zone on a Hot‐Stamped Part with Tailored Tool Tempering Approach by Numerical and Physical Simulation

Study on Microstructure and Properties of Tailored Hot-Stamped U-shaped Parts Based on Temperature Field Control

Research on space temperature environmental performance and technology of aerospace RF cable assembly

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