On the Performance Improvement of Steels through M3 Structure Control

Han, Dong; Sun, Xingjun; Cao, Wenquan; Liu, Zhengdong; Wang, Maoqiu; Weng, Yuqing

doi:10.1007/978-3-642-17665-4_6

Cited by 14 publications

(14 citation statements)

References 19 publications

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“…Strength represents the ability of a material to resist external deformation from the point of view of force, and elongation represents the ability of a material to deform without fracture under external force. As an index of energy absorption of materials, the product of strength (R m ) and total tensile elongation (A), R m × A, has been applied to tailor the steels for automobile application [36,37,38,39]. Table 2 gives the corresponding mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

“…The tensile strength is required by the rigid zone, which is designed to maintain its integrity with minimal intrusion to protect the occupants and the fuel tank, which can easily be achieved by cold working deformation. The yield strength is important especially for complicated fabricated parts like cross members, longitudinal beams, B-pillar reinforcements, sills, and bumper reinforcements, etc, which can be cold-formed by Q-P high strength steel rather than conventional HSS with similar strength levels [36]. The material is required to have high tensile strength in combination with ductility, i.e., high strain hardening regardless of their yield strength [27].…”

Section: Resultsmentioning

confidence: 99%

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Microstructures and Properties of a Low-Carbon-Chromium Ferritic Stainless Steel Treated by a Quenching and Partitioning Process

et al. 2019

Materials

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Low chromium ferritic stainless steel has great potential in automobile structures for improved strength. In this study, quenching and partitioning (Q-P) treatment was applied to a low-carbon-chromium ferritic stainless steel and compared with traditional heat treatment (quenching-tempering [Q-T] and annealing) in terms of microstructure, mechanical properties, corrosion resistance, and deformation of plate. The results show that the quenching and partitioning (Q-P) treatment has a series of advantages over conventional heat treatments (quenching-tempering and annealing). In terms of mechanical properties, it achieves a good match between strength and plasticity by combining the advantages of “soft state” with high elongation resulting from conventional annealing and high strength "hard state” through the traditional quenching-tempering process. The material possesses better crash safety; for the quenching-partitioning (Q-P) process, quenching-tempering process, and annealing process, the production of strength plasticity is about 16 GPa%, 15 GPa%, and 14 GPa%, respectively. The material has low yield strength, high work hardening index (compared with Q-T), a smooth tensile curve, and no yield plateau (compared with annealing), so it has better forming performance and processing surface, and the corrosion resistance has also improved. The pitting potential of the samples produced by the quenching treatment of Q-P and Q-T increased by about 0.2 V, which is about 20% higher than the one by the traditional annealing process.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Microstructures and Properties of a Low-Carbon-Chromium Ferritic Stainless Steel Treated by a Quenching and Partitioning Process

et al. 2019

Materials

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“…After the production process, the microstructure of medium-Mn steel is composed of multiple constituents, i.e., ferrite and retained austenite, on different length scales. Dong et al [130] have proposed a novel control theory for microstructures that are multi-phase, multi-scale and metastable In addition, production costs for MMn steels could possibly be reduced by directly using cold-rolled, hot-rolled or warm-rolled sheet without ART annealing as the initial state for the hot stamping process. Li et al [122] directly used cold-rolled MMn steels as the hot-stamping material and found that the final mechanical properties of the stamped parts were similar to those of the ART-annealed material.…”

Section: Production Process For Medium-mn Steelsmentioning

confidence: 99%

Section: Production Process For Medium-mn Steelsmentioning

confidence: 99%

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Tong

Rong

Yardley

et al. 2020

Metals

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Improvement of the hot stamping process is important for reducing processing costs and improving the productivity and tensile properties of final components. One major approach to this has been to conduct all or part of the process at lower temperatures. The present paper reviews the state of the art of hot stamping techniques and their applications, considering the following aspects: (1) conventional hot stamping and its advanced developments; (2) warm stamping approaches in which complete austenitisation is not attained during heating; (3) hot stamping with a lower forming temperature, i.e., low-temperature hot stamping (LTHS); (4) advanced medium-Mn steels with lower austenitisation temperatures and their applicability in LTHS. Prospects for the further development of LTHS technology and the work required to achieve this are discussed.

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“…1) In this regard, grain refinement from micrometer to submicron or nanometer scale is an important mechanism to improve the strength of metals and alloys. Several different techniques have been utilized to produce ultrafine grained (UFG, d<1 μm) and nano grained (NG, d<100 nm) metals.…”

Section: Introductionmentioning

confidence: 99%

Formation of Nano/ultrafine Grain Structure in a Ti-modified 201L Stainless Steel through Martensite Thermomechanical Treatment

2014

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The formation of nano/ultrafine grain structure in a Ti-modified 201L austenitic stainless steel using the martensite thermomechanical treatment was investigated. Effects of Ti micro-alloy addition on the formation of strain-induced martensite (SIM) during cold rolling and austenite reversion during subsequent annealing were studied. The results showed that the nano-grained Ti-modified 201L steel with the average grain size of 45 nm possessed the yield strength of 1 000 MPa, ultimate tensile strength of 1 330 MPa and total elongation of 42%. Such improvement in mechanical properties of the thermomechanically processed steel is believed to be due to the formation of SIM supplemented with precipitation of Ti carbides.

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On the Performance Improvement of Steels through M3 Structure Control

Cited by 14 publications

References 19 publications

Microstructures and Properties of a Low-Carbon-Chromium Ferritic Stainless Steel Treated by a Quenching and Partitioning Process

Microstructures and Properties of a Low-Carbon-Chromium Ferritic Stainless Steel Treated by a Quenching and Partitioning Process

New Developments and Future Trends in Low-Temperature Hot Stamping Technologies: A Review

Formation of Nano/ultrafine Grain Structure in a Ti-modified 201L Stainless Steel through Martensite Thermomechanical Treatment

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