ORCID Profile
0000-0002-5790-6052
Current Organisation
Northeastern University
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Publisher: Elsevier BV
Date: 07-2022
Publisher: Springer Science and Business Media LLC
Date: 30-03-2022
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 10-2022
Publisher: Wiley
Date: 04-08-2021
Abstract: Herein, the effect of Nb content on the phase transformation kinetics, microstructure, and mechanical properties of hot‐rolled quenching and partitioning (Q& P) steel is investigated. The characteristics of three C–Mn–Si–Ti steels (0.18C, 2.0Si, 2.6Mn, and 0.015Ti) containing 0, 0.027, or 0.061 wt% Nb are compared. Results reveal that grain boundary pinning by precipitates and Nb solute drag effects refine the austenite grain size during the hot‐rolling process the microstructural refinement is carried over to the final microstructure subjected to the Q& P treatment. The remaining supersaturated Nb suppresses the bainite formation and decreases the final bainite fraction formed in the Q& P process. The microstructural evolution leads to an increase in the ultimate tensile strength (UTS) of the steel containing 0.027 wt% Nb from 1169 to 1228 MPa, while keeping the total elongation at 18%. When the Nb content is increased to 0.061 wt%, the UTS of the steel increases to 1313 MPa, but the elongation at break drops to 16%. The effect is due to the carbon consumption by the Nb precipitates, which causes a decrease in the stability of the retained austenite and reduces the strain hardening at high strain levels.
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 10-2022
Publisher: American Association for the Advancement of Science (AAAS)
Date: 03-2019
Abstract: High-strength aluminum alloys are important for producing lightweight cars, trains, and airplanes. The traditional strategy for doing this is through hours of high-temperature cycling to form precipitates in the alloy. Sun et al. developed a processing method that relies on mechanical cycling by pushing and pulling on the alloys at room temperature. This quickly creates many very fine precipitates that have the same strengthening effect as those characteristic of traditional thermal methods. This method should also work for other alloy systems. Science , this issue p. 972
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 02-2022
Publisher: MDPI AG
Date: 02-03-2022
DOI: 10.3390/MET12030439
Abstract: Instrumented indentation can be effectively used to investigate the Portevin–Le Chatelier (PLC) effect at small scales. It has been shown that the PLC effect in single crystals may depend on the crystal orientation, yet the underlying mechanism is unclear. Here, the orientation dependence of the PLC effect was systematically studied by conducting instrumented indentation tests in the [001]-, [101]- and [111]-oriented grains of a polycrystalline twinning-induced plasticity steel. It is found that the crystal orientation does not affect the PLC effect at relatively high indentation strain rates. In contrast, there is a strong orientation dependence at lower rates, with enhanced difficulty in the formation of serrations in the order of the [001], [111] and [101] orientations. This finding contradicts the previous proposals of the orientation effects, which are associated with the dislocation waiting time. On the basis of both the orientation and rate effects observed here, we proposed that the crystal orientation influences the occurrence of serrations in instrumented indentation by affecting the number of activated slip systems and, therefore, the probability of finding sufficient dislocation sources to accommodate the plastic avalanche.
Publisher: Elsevier BV
Date: 2019
DOI: 10.2139/SSRN.3532190
Publisher: MDPI AG
Date: 27-02-2023
DOI: 10.3390/MET13030489
Abstract: Al-Si-coated boron-alloyed steels are the most widely used press-hardened steels (PHSs), which offers good oxidation resistance during hot forming due to the presence of the near eutectic Al-Si coating. In this study, a recently developed novel un-coated oxidation resistant PHS, called coating-free PHS (CF-PHS), is introduced as an alternative to the commercial Al-Si coated PHSs. With tailored additions of Cr, Mn, and Si, the new steel demonstrates superior oxidation resistance with a sub-micron oxide layer after the conventional hot st ing process. Hence, it does not require shot blasting before the subsequent welding and E-coating process. Two CF-PHS grades have been developed with ultimate tensile strengths of approximately 1.2 and 1.7 GPa, respectively. Both grades have a total elongation of 8–9%, exceeding the corresponding Al-Si-coated PHS grades (1.0 GPa/6–7%, 1.5 GPa/6–7%). Furthermore, the bendability of CF-PHS was similar to the corresponding Al-Si PHS grades. On the other hand, performance evaluations relevant to automotive applications, such as weldability, the E-coat adhesion, and tailor-welded hot st door ring, were also conducted on the CF-PHS steel to satisfy the requirements of manufacturing.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 15-05-2021
No related grants have been discovered for Lingyu Wang.