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Mn Heterogeneity and Ductility Improvement Realized by Slow Heating Mn-Partitioned Pearlit
Dezhen Yang,Jiusan Xiao,Chao Zhang,Yingchun Wang,Zhiping Xiong 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.2
The Mn heterogeneity in the medium manganese steel has been realized deliberately using fast heating. However, fast heatingis not easy for industrial production. Here, we counter-intuitively demonstrate that the slow heating not only can retain theMn-heterogeneous distribution from alternative Mn-enriched cementite and Mn-depleted ferrite in the initial pearlite, butalso modify the stability, morphology and fraction of retained austenite (RA). Compared to fast heating, a wider distributionand a lower average content of Mn in film RA are achieved due to the transition of austenite formation from partition localequilibrium to negligible partition local equilibrium. Meanwhile, the slow heating boosts the dissolution of the sphericalcementite, leading to a stronger retention of spherical RA. Consequently, slow heating exhibits a 30% larger ductility owingto a stronger austenite-to-martensite transformation during straining while the strength keeps similar. The present studyindicates that the slow heating opens a new avenue to produce Mn-heterogeneous steels having high strength and ductility.
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Qingyu Su,Zhongxin Fan,Dezhen Zhang,Jian Li 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.8
This paper finishes the fault detection (FD) problem for switched singular systems with all subsystems unstable. Considering the particularity of singular systems, the regularity and impulse-free property analysis on it are carried out. Utilizing a time-driven switching strategy, a switching signal is proposed and the finite-time stability is guaranteed firstly. Then, with the help of discretized Lyapunov function, a piecewise Lyapunov function is employed to accomplish the finite-time boundedness with L2-gain analysis. Through transferring the fault detection filters design into the L2-gain analysis, we can obtain the existence conditions of the FD detector via linear matrices inequalities (LMIs). Finally, the effectiveness and validity are illustrated by two examples.
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Deqing Xue,Ruihao Yuan,Dezhen Xue,Yumei Zhou,Guojun Zhang,Xiangdong Ding,Jun Sun 한국물리학회 2018 Current Applied Physics Vol.18 No.7
The damping and transformation behaviors of Ti50(Pd50−xCrx) shape memory alloys with x ranging from 4.0 to 5.0 are systematically investigated. The damping capacity (Q−1) at the martensitic transformation is found to be inversely proportional to the square root of frequency, i.e., Q−1∝ω−0.5. A relaxation peak or shoulder is observed slightly below the martensitic transformation damping peak for compositions within the compositional crossover region (4.5 ⩽x⩽ 4.8). Furthermore, the damping capacity at the martensitic transformation is smaller within the compositional crossover region (4.5 ⩽x⩽ 4.8), compared with that of compositions at both sides (x = 4.0 and x = 5.0). These observations can be ascribed to the hysteretic motion of interfaces between different phases near the compositional crossover region.
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Qiao Ning,Liu Yongguang,Liu Jie,Zhang Dezhen,Chi Wenjuan,Li Jintang,Zhu Xiaoping,Liu Hongmei,Li Fajun 한국유전학회 2023 Genes & Genomics Vol.45 No.1
Background Tomato spot wilt virus (TSWV) and tomato yellow leaf curl virus (TYLCV) are highly harmful viruses in agricultural production, which can cause serious economic losses to crops and even devastating consequences for vegetable yield in some countries and regions. Although the two viruses belong to different families and have different transmission vectors, they share most hosts. Objective This study aimed to examine the transcriptomic expression of single and mixed inoculations of TSWV and TYLCV, leading to antagonism using high-throughput RNA sequencing. Methods We confirmed the single and mixed infections of these viruses in Nicotiana benthamiana (N. benthamiana) by artificial inoculation. And the expression changes of related genes and their biological functions and pathways during the mixed infection of TSWV and TYLCV were analyzed by comparative transcriptome. Results Basically, similar symptoms were observed in the plants singly infected with TSWV and co-infected with TYLCV; the symptoms of TYLCV in the co-infected plants were not obvious compared with single TYLCV infections. When inoculated with TYLCV, the accumulation of the virus significantly reduced in single and mixed infections with TSWV; the TSWV accumulated slightly less in co-infection with TYLCV, whereas this reduction was much smaller than that of TYLCV. The results suggested that TSWV had an antagonistic effect on the accumulation of TYLCV in N. benthamiana. It mainly focused on the changes in unique differentially expressed genes (DEGs) caused by the co-infection of TSWV and TYLCV. The eight pathways enriched by upregulated DEGs mainly included amino acid biosynthesis, citrate cycle (or tricarboxylic acid cycle, TCA cycle), and so on. However, only pentose phosphate pathway (PPP) and peptidoglycan biosynthesis could be downregulated in the Kyoto Encyclopedia of Genes and Genomes pathway in which peptidoglycan biosynthesis was involved in upregulated and downregulated pathways. Conclusions The antagonistic effect of TSWV on TYLCV in N.benthamiana and the change trends and specific pathways of DEGs in this process were found. Our study provided new insights into the host regulation and competition between viruses in response to TSWV and TYLCV mixed infection.
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Preparation and Microstructure Control of PMDA/ODA Polyimide Hollow Fibers
Meifeng Xiao,Jianhua Li,Huanyu Lei,Mengying Zhang,Hongqing Niu,Dezhen Wu,Xiaodong Wang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
Poly(4,4'-oxydiphenylene pyromellitimide) (PMDA/ODA) hollow fiber membranes with regular morphologieshave been successfully prepared through a two-step dry-jet wet spinning method. The morphologies of polyimide (PI) hollowfibers were regulated via adjusting the major spinning parameters, including dope/bore flow rate ratio, bore fluidcomposition, coagulation bath temperature and air gap distance. SEM results show that the morphologies of PI hollow fibersstrongly depended on the spinning conditions, and fibers with regular asymmetric structures were finally obtained. The fiberwall thickened with the increase of dope/bore flow rate ratio, and the fibers could well self-support when the dope/bore flowrate ratio ranged from 3:1 to 4:1. While higher DMAc content in the bore fluid was conducive to the formation of finger-likevoids, reduced amount of DMAc would result in smaller finger-like voids and thereby lower overall porosities as well asbetter mechanical properties. Moreover, the finger-like voids and surface defects could be effectively prevented by loweringthe coagulation bath temperature or extending the air gap distance. Gas separation and mechanical properties of the hollowfibers were found closely related to these morphological changes. On such basis, regular PI hollow fibers with differentmicrostructures and Young’s modulus up to 1040 MPa were successfully fabricated. The prepared polyimide hollow fibersare promising candidates for fine separation under high temperature and high pressure or can be employed as the support ofcomposite membranes.
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