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Synergic Evolution of Microstructure‑Texture‑Stored Energy in Rare‑Earth‑Added Interstitial‑Free Steels Undergoing Static Recrystallization

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 661-680页

作者： Peng Liu Xiaodong Hou Chaoyun Yang yikun luan Chengwu Zheng Dianzhong Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Centre of Excellence for Advanced Materials Dongguan 523808China

Synergic evolution of microstructure-texture-stored energy in interstitial-free(IF)steels has been investigated to elaborate the effect of dissolved rare-earth(RE)elements on static recrystallization.Grain size,texture fraction and geometrically necessary dislocation distribution of IF steel samples annealed for different times were compared,suggesting that RE elements could postpone recrystallization nucleation but accelerate grain coarsening.The visco-plastic self-consistent model was primarily adopted and verified,then used to calculate the relative activities of different slip systems.It was proved that the compatible deformation of IF steels was very sensitive to dissolved RE elements,in particular the{110}62 slip systems became extremely inactive,leading to anα-fibre textures rich configuration of RE-IF steels.Although both IF steels have the same stored energy sequence of whichγ-fibre takes precedence in nucleation followed byα-fibre,the nucleation rates ofα/γ-fibres driven by the reduced stored energy slowed down in RE-IF steels.Further nucleation-path analyses revealed that shear bands withinγ-fibre mainly sacrificed for grain nucleation of{111}orientation,whileα-fibre especially prior grain boundaries therein preferred supplying nucleation sites for{554}grains,which accounting for the competitive growth ofγ-fibre textures in RE-IF steels rather than being dominated by a single orientation.After grain growth,the major texture of Normal-IF steels had been transferred to{554}from{111},while{554}in RE-IF steels still inherited the orientation advantage and grew up rapidly,thus inducing the grain coarsening.As this work offers a significant understanding of RE microalloying effect on static recrystallization,it will provide references for alloy design and industrial application of IF steels.

关键词： Static recrystallization IF steels RE elements Texture Grain coarsening Slip systems

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Effects of rare earth elements on inclusions and impact toughness of high-carbon chromium bearing steel

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Journal of Materials Science & Technology 2019年第7期35卷 1298-1308页

作者： Chaoyun Yang yikun luan Dianzhong Li Yiyi Li Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

High-carbon chromium bearing steels with different rare earth (RE) contents were prepared to investigate the effects of RE on inclusions and impact toughness by different techniques. The results showed that RE addition could modify irregular Al2O3 and MnS into regular RE inclusions. With the increase of RE content, the reaction sequence of RE and potential inclusion forming elements should be O, S, As, P and C successively. RE inclusions containing C might precipitate in molten steel and solid state, but the precipitation tem perature was significantly higher than that of carbides in high-carbon chromium bearing steel. For experim ental bearing steels, the volume fraction of inclusions increased steadily with the increase of RE content, but smaller and more dispersed inclusions could be obtained by 0.018% RE content compared with bearing steel without RE, whereas the continuous increase of RE content led to an increasing trend for inclusion size and a gradual deterioration for inclusion distribution. RE addition could improve the transverse impact toughness and isotropy of bearing steel, and for modified highcarbon chrom ium bearing steel by RE alloying, the increase of RE content continuously increased both transverse and longitudinal im pact toughness until excessive RE addition.

关键词： High-carbon chromium bearing steel Rare earth Inclusions Impact toughness

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GCr15钢滚动轴承疲劳剥落失效过程中一种针状相的形成

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金属学报 2024年第4期60卷 425-433页

作者：程胜孙阳赵文辉栾义坤郑成武李殿中中国科学院金属研究所沈阳材料科学国家研究中心沈阳110016 中国科学技术大学材料科学与工程学院沈阳110016 沈阳工业大学机械工程学院沈阳110870

在发生表面剥落的GCr15钢滚动轴承的表面裂纹附近发现了一种针状相,利用SEM、透射Kikuchi衍射(TKD)和TEM等表征手段研究了这种针状相的微观特征,分析了这种针状相的形成机理及其与表面裂纹的相互作用。结果表明,在GCr15钢滚动轴承表面... 详细信息

在发生表面剥落的GCr15钢滚动轴承的表面裂纹附近发现了一种针状相,利用SEM、透射Kikuchi衍射(TKD)和TEM等表征手段研究了这种针状相的微观特征,分析了这种针状相的形成机理及其与表面裂纹的相互作用。结果表明,在GCr15钢滚动轴承表面诱发的裂纹附近所形成的针状相是一种特殊的马氏体退化组织。这种针状相是因局部应力作用而形成的细长条状组织,其三维形貌为薄板状,内部存在微观孔洞和等轴状纳米晶。在滚动接触疲劳过程中,表面裂纹会优先沿针状相的微观孔洞扩展,使针状相的形成与表面裂纹的扩展相互促进,加速了轴承表面疲劳剥落的发生。

关键词： GCr15钢滚动接触疲劳表面裂纹针状相

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Chemical Compositions,Microstructure and Mechanical Properties of Roll Core used Ductile Iron in Centrifugal Casting Composite Rolls

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Journal of Materials Science & Technology 2012年第9期28卷 853-858页

作者： Yunlong Bai yikun luan Nannan Song Xiuhong Kang Dianzhong Li Yiyi Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The industrial manufacture processes of three kinds of roll core used ductile irons have been investigated via systematical experiments. EfFects of the ratio of C/Si, pig iron, nodularizer and alloying method on the microstructure and mechanical properties of the heavy section ductile iron have been analyzed. It has been found that when treated with RE-Mg plus Sb, high quality nodular castings can be produced even if much anti spheroidizing alloy elements are included in the pig iron. The alloy element Sb played an important role in the control of graphite morphology.

关键词： Centrifugal casting Roll Heavy section ductile iron Micro-alloying with Sb

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Numerical Simulation of Solidification of Work Roll in Centrifugal Casting Process

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Journal of Materials Science & Technology 2012年第2期28卷 147-154页

作者： Nannan Song yikun luan Yunlong Bai Z.A. Xu Xiuhong Kang Dianzhong Li Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China SIRRIS the Collective Center for the Belgian Technological Industry Technologiepark 915 9052 Zwijnaarde Belgium

A program on the solidification process of horizontal centrifugal casting coupled with eutectic carbides segregation has been developed in this paper. Due to the geometrical features of work roll, a cylindrical coordinate system was used. The temperature field of the outer layer at the end of filling process was imported as the initial temperature condition for the solidification process. The model of eutectic carbides segregation caused by different densities between eutectic MC and the molten steel was coupled in the program. The temperature field of the outer layer of work roll during horizontal centrifugal casting process was investigated. Results show that the outer layer has a ＂sandwich shape＂ solid fraction manner. Results also indicate that the segregation of eutectic MC is quite severe during centrifugal casting process. It forms four zones of different content of carbides in radial direction. The simulated results of MC carbides segregation phenomenon agree with the experimental observations.

关键词： Numerical simulation Horizontal centrifugal casting MC segregation Work roll

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装配式组合钢箱梁对提高桥梁施工效率的影响研究

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科学技术创新 2024年第13期 101-104页

作者：张佳明斯朗拥宗栾宏阳杜咏峥付轶坤西藏大学工学院西藏拉萨西藏自治区工程研究中心西藏拉萨

随着经济的发展和交通需求的增加,桥梁建设变得越来越重要。传统的桥梁施工方法往往需要较长的施工周期和大量的人力物力投入。然而,装配式组合钢箱梁的引入为桥梁施工带来了革命性的变化。文章首先介绍了装配式组合钢箱梁桥的施工工艺... 详细信息

随着经济的发展和交通需求的增加,桥梁建设变得越来越重要。传统的桥梁施工方法往往需要较长的施工周期和大量的人力物力投入。然而,装配式组合钢箱梁的引入为桥梁施工带来了革命性的变化。文章首先介绍了装配式组合钢箱梁桥的施工工艺,接着分析施工阶段单梁静载的影响,最后运用引入松弛系数的满应力齿行法优化求取最大约束值和整体偏移。

关键词：装配式组合钢箱梁桥梁施工单梁静载松弛系数满应力齿行法

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Computer simulation of core filling process of cast high speed steel roll

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China Foundry 2009年第4期6卷 314-318页

作者： Song Nannan luan yikun Bai Yunlong Kang Xiuhong Xia Lijun Li Dianzhong Shenyang National Laboratory for Material Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Core filling process of cast high speed steel roll was simulated.Ductile iron was used as core material.The influences of filling parameters,such as core filling time and core filling temperature,on the filling process were investigated.Based on the simulated results,optimal core filling parameters were determined.The predicted temperature fields show that the temperature at the roll shoulder is the lowest during the core filling process and usually causes binding defects there.Method for solving this problem was presented.

关键词：高速钢轧辊计算机模拟铸造工艺填补灌装过程核心温度数值模拟球墨铸铁

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A transceptor-channel complex couples nitrate sensing to calcium signaling in Ambidopsis

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Molecular Plant 2021年第5期14卷 774-786页

作者： Xiaohan Wang Changxin Feng LiLi Tian Congcong Hou Wang Tian Bin Hu Qian Zhang Zhijie Ren Qi Niu Jiali Song Dongdong Kong Liangyu Liu yikun He Ligeng Ma Chengcai Chu Sheng luan Legong Li College of Life Sciences Capital Normal UniversityBeijing 100048China State Key Laboratory of Plant Genomics Institute of Genetics and Developmental Biologythe Innovative Academy for Seed DesignChinese Academy of SciencesBeijing 100101China Department of Plant and Microbial Biology University of California at BerkeleyBerkeleyCA 94720USA

Nitrate-induced Ca^(2+) signaling is crucial for the primary nitrate response in plants.However,the molecular mechanism underlying the generation of the nitrate-specific calcium signature remains unknown.We report here that a cyclic nucleotide-gated channel(CNGC)protein,CNGC15,and the nitrate transceptor(NRT1.1)constitute a molecular switch that controls calcium influx depending on nitrate levels.The expression of CNGC15 is induced by nitrate,and its protein is localized at the plasma membrane after establishment of young seedlings.We found that disruption of CNGC15 results in the loss of the nitrate-induced Ca^(2+) signature(primary nitrate response)and retards root growth,reminiscent of the phenotype observed in the nrt1.1 mutant.We further showed that CNGC15 is an active Ca^(2+)-permeable channel that physically interacts with the NRT1.1 protein in the plasma membrane.Importantly,we discovered that CNGC15-NRT1.1 interaction silences the channel activity of the heterocomplex,which dissociates upon a rise in nitrate levels,leading to reactivation of the CNGC15 channel.The dynamic interactions between CNGC15 and NRT1.1 therefore control the channel activity and Ca^(2+) influx in a nitrate-dependent manner.Our study reveals a new nutrient-sensing mechanism that utilizes a nutrient transceptor-channel complex assembly to couple nutrient status to a specific Ca^(2+) signature.

关键词： primary nitrate response nutrient sensing calcium signature nitrate transceptor calcium channel

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固态补缩机制及其在大高径比铸件上的应用

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金属学报 2016年第12期52卷 1510-1516页

作者：陈龙飞栾义坤李殿中李依依中国科学院金属研究所沈阳材料科学国家(联合)实验室沈阳110016

鉴于液态补缩机制不能解决大高径比铸件中心缩孔疏松缺陷,提出了固态补缩机制.通过分析金属液静水拉力对内孔形核和固相屈服变形的作用,阐明了固态补缩机制的原理,并得出了影响铸件固态补缩能力的主要因素:液体破裂压力值、金属液气体... 详细信息

鉴于液态补缩机制不能解决大高径比铸件中心缩孔疏松缺陷,提出了固态补缩机制.通过分析金属液静水拉力对内孔形核和固相屈服变形的作用,阐明了固态补缩机制的原理,并得出了影响铸件固态补缩能力的主要因素:液体破裂压力值、金属液气体含量以及固相屈服强度.在此基础上,提出了降低铸件在径向上的温度梯度是减少大高径比铸件缩孔疏松缺陷的有效方法.最后,设计了铸件在不同模具温度下凝固的验证实验,证实了固态补缩对于减少大高径比铸件缩孔疏松的作用.

关键词：铸件缩孔疏松固态补缩静水拉力

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离心铸造轧辊用高速钢的热处理

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金属学报 2009年第4期45卷 470-475页

作者：栾义坤白云龙宋男男康秀红李殿中中国科学院金属研究所沈阳材料科学国家(联合)实验室沈阳110016

采用差式扫描量热法(DSC)及热膨胀法测定了离心铸造轧辊用高速钢的相变点,根据高速钢的临界转变温度,进行了退火、淬火和回火实验.着重研究了热处理过程中碳化物演变对轧辊用高速钢性能的影响.结果表明:退火温度需高于630℃,才能使铸态... 详细信息

采用差式扫描量热法(DSC)及热膨胀法测定了离心铸造轧辊用高速钢的相变点,根据高速钢的临界转变温度,进行了退火、淬火和回火实验.着重研究了热处理过程中碳化物演变对轧辊用高速钢性能的影响.结果表明:退火温度需高于630℃,才能使铸态高速钢得到软化,硬度降低,便于切削加工.热处理前后,MC型一次共晶碳化物的成分、形态和数量基本没有变化;随着淬火温度的升高,处于亚稳状态的M_2C型共晶碳化物的分解数量越来越多.高速钢最终硬度受回火温度影响较大,研究了回火温度与二次硬化之间的关系,确定了二次硬化峰值温度,研究了二次碳化物的溶解与析出对高速钢基体组织与力学性能的影响规律.

关键词：高速钢热处理共晶碳化物二次碳化物硬度

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