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Formation of (α+θ) Microduplex Structure and Its Mechanical Properties in High Carbon Steel

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Formation of (α+θ) Microduplex Structure and Its Mechanica...

第二届先进钢铁结构材料国际会议

作者： T. Maki Department of Materials Science and Engineering Kyoto University Sakyo-ku Kyoto 606-8501 Japan

The characteristics and mechanical properties of the (α+θ) microduplex structures formed by various thermomechanical processings were studied in a high carbon steel (Fe-1.4Cr-1.0C). When the pearlite was austenitized in the (γ+θ) region, quenched and tempered at the temperature below A, an (α+θ) microduplex structure in which most of αboundaries are of high-angle one is formed through the recovery of lath martensite during tempering. Such (α+θ) microduplex structure with high-angle αboundaries exhibits superior superplasticity compared with those formed by the heavy warm rolling of pearlite, or by the annealing of heavily cold-rolled pearlite which contain higher fraction of low-angle αgrain boundaries. Although the microduplex structures obtained various thermomechanical processings exhibit nearly the same tensile strength (about 1.0GPa) at room temperature, the ductility is markedly influenced by the nature of αgrain boundaries. The specimens which contain large portion of high-angle αgrain boundaries exhibit better ductility such as 25% in total elongation.

关键词： High Carbon Steel Microduplex Structure Superplasticity Strength ductility

FEM and multi-objective optimization of B-pillar with tailored propertie

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FEM and multi-objective optimization of B-pillar with tailor...

作者： Weixin Xing Bingtao Tang Jiyuan Liu Ning Guo School of Mechanical and Automotive Engineering Qilu University of Technology（Shandong Academy of Sciences）

At present, the traditional high-strength hot stamping parts cannot play the role of buffering energy absorption due to insufficient ductility, and cannot meet the current requirements of automotive safety. By heating the hot stamping die and changing the cooling rate, the hot forming parts with gradient performance are obtained. It is a new hot stamping process based on the traditional hot stamping process. In this paper, the B-pillar is used as the research object, and the Ls-dyna simulation software is used to optimize the hot-stamping parameters of the B-pillar gradient performance based on the mode Frontier optimization platform. The temperatures of upper and lower die, sheet initial temperature, and dwell time are input as process variables, and the final temperature of hot stamped component, sheet thickness, and thinning rate are selected to be objective functions to obtain more accurate process parameters. It is suggested that the initial temperature of sheet metal is 930℃, the temperature of heated upper and lower die is 500℃, the temperature of the unheated lower and upper die is 30℃, and the dwell time is 20 s. Finally, the optimized process parameters are used to simulate the tailored tempering process of B-pillar to verify its feasibility.

关键词： Hot stamping tailored tempering process tensile strength ductility gradient performance

RE—Al Conductor Production Expanded

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China Rare Earth Information 1993年第1期 1-2页

In accordance with the characteristics ofChina’s mineral resources,Chinese researchers havedeveloped the title new conductor that reaches inter-national standards.The RE-Al conductor has betterelectrical conductivity... 详细信息

关键词： tensile ductility reaches accordance RE stronger lifetime transmit raise

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高强混凝土RC与SRC结构研究

高强混凝土RC与SRC结构研究

全国高强与高性能混凝土及其应用专题研讨会

作者：林明强姜维山安建利西安建筑科技大学土木工程学院西安建筑科技大学土木工程学院西安建筑科技大学土木工程学院

＜正＞一前言近年来,建筑物向高层化和大跨度化发展,建筑材料也相应的有很大发展。高强材料特别是高强混凝土的应用越来越广泛,而高强混凝土在受压时呈脆性,延性很差,采用一般箍筋,其约束力己不满足约束高强混凝土的横向变形。因而主要... 详细信息

＜正＞一前言近年来,建筑物向高层化和大跨度化发展,建筑材料也相应的有很大发展。高强材料特别是高强混凝土的应用越来越广泛,而高强混凝土在受压时呈脆性,延性很差,采用一般箍筋,其约束力己不满足约束高强混凝土的横向变形。因而主要受力构件必须设计成配以高强螺旋箍筋的钢筋混凝土,或者设计成为型钢混凝土来满足构件延性的需要。试验证明:在RC和SRC柱中用高强箍筋来约束高强混凝土可以得到很好的约束效果。

关键词： High-strength concrete High-strength spiral hoping ductility

配箍率对型钢高强混凝土柱延性性能影响的研究

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配箍率对型钢高强混凝土柱延性性能影响的研究

第六届全国高强与高性能混凝土学术交流会

作者：李立仁陈永庆甘民重庆大学土木工程学院

1 概述近二十年来,国内大量的高校与科研院所对型钢混凝土结构进行了广泛而深入的研究, 得出了大量的研究成果,并在此基础上,形成了具有里程碑式意义的二部规程,正式提出了型钢混凝土结构基本计算理论,对型钢混凝土结构基本构件的计算... 详细信息

1 概述近二十年来,国内大量的高校与科研院所对型钢混凝土结构进行了广泛而深入的研究, 得出了大量的研究成果,并在此基础上,形成了具有里程碑式意义的二部规程,正式提出了型钢混凝土结构基本计算理论,对型钢混凝土结构基本构件的计算方法做出了明确规定。二部规程的推出对指导型钢混凝土结构在我国的应用与发展具有重要意义。

关键词： Steel Reinforced High-strength Concrete column Stirrup ratio Shear-span ratio is five（λ=5） Load-displacement loop ductility

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结构材料离位损伤截面计算

IMP & HIRFL Annual Report 2018年第1期 216-217页

作者： Korepanova Nadezda Gu Long 不详

A structural material in a nuclear reactor is damaged by neutrons.Neutrons transfer their kinetic energy to atoms,which in its turn start to displace other atoms from its sites and create vacancies and interstitial atoms when displaced atoms come to rest in a location between lattice sites.The vacancy-interstitial pair is known as Frankel Pair(FP).The FPs are key to radiation effects in materials.Their appearance is the main cause of defects formation and change in physical properties,such as a change in shape,increasing of hardness and embrittlement,reduction in ductility,and inducing cracking.

关键词： ductility section vacancy

In-situ TEM experiments demonstrate large plasticity in pure magnesium mediated by pyramidal dislocations

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Science Foundation in China 2019年第3期27卷 14-14页

With the support by the National Natural Science Foundation of China,the research team led by Prof.Shan ZhiWei(单智伟)at the Center for Advancing Materials Performance from the Nanoscale(CAMPNano),State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,clarified the controversies regarding pyramidal dislocations that are critical to understanding the ductility of magnesium,which was published in Science(2019,365:73-75).

关键词： ductility magnesium clarified