检索结果-南通市图书馆

Machine learning study on time-temperature-transformation diagram of carbon and low-alloy steel

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and steel Research International 2023年第5期30卷 1032-1041页

作者： Xiao-ya Huang Biao Zhang Qiang Tian Hong-hui Wu Bin Gan Zhong-nan Bi Wei-hua Xue Asad Ullah Hao Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Beihang UniversityBeijing 100191China High Temperature Materials Research Division Central Iron and Steel Research InstituteBeijing 100081China Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research InstituteBeijing 100081China School of Materials Science and Engineering Liaoning Technical UniversityFuxin 123099LiaoningChina Department of Mathematical Sciences Karakoram International UniversityGilgit-Baltistan 15100Pakistan

Time-temperature-transformation(TTT)diagram plays a critical role in designing appropriate heat treatment process of steels by describing the relationship among holding time,temperature,and quantities of phase *** predictions for TTT diagrams of new steel rapidly and accurately is therefore of much practical importance,especially for costly and time-consuming experimental ***,TTT diagrams for carbon and low-alloy steels were predicted using machine learning *** commonly used machine learning(ML)algorithms,backpropagation artificial neural network(BP network),LibSVM,k-nearest neighbor,Bagging,and Random tree,were adopted to select appropriate models for the *** results illustrate that Bagging is the optimal model for the prediction of pearlite transformation and bainite transformation,and BP network is the optimal model for martensite ***,the ML framework composed of Bagging and BP network models was applied to predict the entire TTT ***,the ML models show superior performance on the prediction of testing samples than the commercial software JMatPro.

关键词： Time-temperature-transformation diagram Carbon steel low-alloy steel Machine learning Prediction framework

Static Recrystallization Kinetics Model After Hot Deformation of low-alloy steel Q345B

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and steel Research International 2010年第8期17卷 61-66页

作者： MA Bo PENG Yan JIA Bin LIU Yun-fei State Key Laboratory of Metastable Materials Science and Technology Engineering Research Center of Rolling Equipmentand Complete Technology of Ministry of EducationYanshan UniversityQinhuangdao 066004HebeiChina

The static recrystallization behavior of low-alloy steel Q345B during double-pass hot compression deformation tests was investigated in the temperature range of 900-1000 ℃,the true strain range of 0.15-0.25 and the interpass time range of 0.5-50 s on Gleeble-3500 thermo-simulation *** results show that static recrystallization during the interpass time is *** the deformation temperature and strain increase,softening caused by static recrystallization is *** to the analysis and calculation of thermo-simulation data,the static recrystallization activation energy was obtained and static recrystallization kinetics model was ***,the error analysis of static recrystallization kinetics model proved that the model had good ***,this model provides a theoretical basis for static recrystallization（SRX）and will contribute to the development of multipass hot rolling process,in order to control the rolling process more accurately.

关键词： Gleeble-3500 low-alloy steel static recrystallization activation energy kinetics model

Influence of Chromium on Corrosion Behavior of low-alloy steel in Cargo Oil Tank O_2-CO_2-SO_2-H_2S Wet Gas Environment

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and steel Research International 2015年第7期22卷 630-637页

作者： Peng ZHOU Jin-ming LIANG Fei ZHANG Hui-bin WU Di TANG National Engineering Research Center of Advanced Rolling Technology University of Science and Technology Beijing

As international maritime organization （IMO） draft 289 was adopted to develop a low-alloy anti-corrosion steel for the deck of cargo oil tank and to understand corrosion mechanism, corrosion behavior of a low-alloy steel with chromium contents was studied in O2-CO2-SO2-H2 S wet gas environment. Corrosion rate was measured, and the microstructure and morphology of corrosion product film were characterized by scanning electron microscopy （SEM）. The phase and chemical composition of the corrosion product film were investigated by X-ray diffraction （XRD） and energy dispersive spectroscopy （EDS）, respectively. The effect of misorientation distribution on corro- sion resistance of steel was evaluated by electron backscattered diffraction （EBSD）. The results showed that corro- sion rate decreased with increasing chromium content in the low-alloy steel, and the corrosion type was general corrosion. The phenomenon of chromium enrichment was found in corrosion product film consisting of a-FeOOH, γ- FeOOH, sulphur, FeS2 and Fel-xS. The increase of chromium content decreases the amount of high-angle grain boundaries, thus resulting in the improvement of corrosion resistance.

关键词： corrosion cargo oil tank upper deck wet gas low-alloy steel chromium

Dual Phase Heat Treatment of low-alloy steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and steel Research International 2005年第5期12卷 47-51页

作者： HAN Jian-min CUI Shi-hai LI Wei-jing MA Xiao-yan Beijing Jiaotong University Beijing 100044 China

Dual phase heat treatment is an economical and effective way for improving the properties of low carbon steels and low-alloy steel materials. In this paper, the microstructures and mechanical properties of 20MnSi steel treated by different dual phase heat treatment have been studied. The results show that dual phase heat treatment with pre-quenching technique and then heating from room temperature to the critical zone can achieve finer and more homogeneous microstructure than that with pre-normalizing technique and then cooling from austenite zone to the critical zone. Among all factors affecting dual phase heat treatment, quenching temperature at the critical zone and tempering temperature play an important part in mechanical properties. Using proper dual phase heat treatment technique with computer optimized parameters, the yield strength, the elongation and impact toughness of 20MnSi can reach 860 MPa, 16% and 207 MPa respectively.

关键词： low-alloy steel dual phase heat treatment microstructure optimization

Modeling of metadynamic recrystallization kinetics after hot deformation of low-alloy steel Q345B

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2010年第5期17卷 911-917页

作者：马博彭艳刘云飞贾斌 State Key Laboratory of Metastable Materials Science and Technology Yanshan University Engineering Research Center of Rolling Equipment and Complete Technology of Ministry of Education Yanshan University

Based on the steady-state strain measured by single-pass hot compression tests,the method by a double-pass hot compression testing was developed to measure the metadynamic-recrystallization *** metadynamic recrystallization behavior of low-alloy steel Q345B during hot compression deformation was investigated in the temperature range of 1 000-1 100℃,the strain rate range of 0.01-0.10 s -1 and the interpass time range of 0.5-50 s on a Gleeble-3500 thermo-simulation *** results show that metadynamic recrystallization during the interpass time can be *** the deformation temperature and strain rate increase,softening caused by metadynamic recrystallization is *** to the data of thermo-simulation,the metadynamic recrystallization activation energy is obtained to be Qmd=100.674 kJ/mol and metadynamic recrystallization kinetics model is set ***,the error analysis of metadynamic recrystallization kinetics model proves that the model has high accuracy(correlation coefficient R=0.988 6).

关键词： low-alloy steel kinetics model hot deformation metadynamic recrystallization activation energy

MODELING OF AUSTENITE GRAIN SIZE IN low-alloy steel WELD METAL

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2004年第2期17卷 147-154页

作者： A.G.Huang Y.S.Wang Z.Y.Li J.G.Xiong Q.Hu School of Materials Science & Engineering,Huazhong University of Science and Technology,Wuhan 430074,China School of Materials Science & Engineering Huazhong University of Science and Technology Wuhan 430074 China

The size of austenite grain has significant effects on components and proportions ofvarious ferrites in low-alloy steel weld metal. Therefore, it is important to determinethe size of austenite grain in the weld metal. In this paper, a model based upon thecarbon diffusion rate is developed for computing austenite grain size in low-alloy steelweld metal during continuous cooling. The model takes into account the effects of theweld thermal cycles, inclusion particles and various alloy elements on the austenitegrain growth. The calculating results agree reasonably with those reported experimentalobservations. The model demonstrates a significant promise to understand the weldmicrostructure and properties based on the welding science.

关键词： low-alloy steel anstenite mathematical model diffusion

Effect of inter-critical quenching on mechanical properties of casting low-alloy steel

在线全文

学校读者我要写书评

暂无评论

China Foundry 2013年第4期10卷 217-220页

作者： Liu Zhongli Shang Yong Technical Center Yantai Taihai Manoir Nuclear Equipment Co.Ltd.

For some casting low-alloy steels,traditional quenching and tempering heat treatments can improve the strength;however,sometimes the ductility is not satisf ***,some kind of effective heat treatment method seems necessary;one which could improve the ductility,but not seriously affect the *** this paper,the effect of inter-critical quenching(IQ)on the mechanical properties of casting low-alloy steel was *** was added between quenching and tempering heat treatment;and the microstructure and mechanical properties were compared to the same steel with the traditional quenching and tempering *** experimental results show that the microstructure comprises small-size ferrite and martensite when the IQ is adopted;and that different temperatures can control the ferrite quantity and distribution,and,as a result,infl uence the mechanical *** the case of IQ,the tensile strength decreases just a little,but the ductility increases a lot;and the strength-ductility product(its value is the arithmetic product of elongation and tensile strength)increases by between 6%and 10%,which means the IQ heat treatment can improve comprehensive mechanical properties.

关键词： inter-critical quenching low-alloy steel strength-ductility product

An Analysis on Application and Trend of low-alloy steel in Shipbuilding and Offshore Engineering Industry

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and steel Research International 2011年第S1期18卷 827-830页

作者： LI Xin-xin,NA Rong-qing,MENG Zhao-chuang (Dalian Shipbuilding Industry Engineering and Research Institute,Dalian 116000,Liaoning,China) Dalian Shipbldg Ind Engn & Res Inst Dalian 116000 Liaoning Peoples R China

Since 2003,China shipbuilding industry has stepped into the orbit of fast *** this paper,a brief analysis has been made on application of low-alloy steel in the shipbuilding and offshore engineering industry,and the further requirements on the marine steel plates elaborated in combination with the future development trend in this ***,a reference approach is proposed for potential cooperation between the shipbuilding industry and steel industry.

关键词： low-alloy steel ship and offshore engineering

Corrosion Behavior of low-alloy Pipeline steel with 1% Cr Under CO_2 Condition

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第6期28卷 739-747页

作者： Zhen-Guang Liu Xiu-Hua Gao Chi Yu Lin-Xiu Du Jian-Ping Li Ping-Ju Hao The State Key Lab of Rolling and Automation Northeastern University School of Resource and Material Northeastern University at Qinhuangdao Mechanical and Electrical Engineering Shijiazhuang Vocational College for Scientific and Technical Engineering

Carbon dioxide corrosion behavior of low-alloy pipeline steel with 1% Cr exposed to CO2-saturated solution was investigated by immersion experiment. SEM, EDX, TEM, EPMA and XRD were utilized to investigate the microstructure, corrosion morphologies, corrosion phases and elements distribution of corrosion scale. The results demon strate that the microstructure of tested steel consists of ferrite and carbides. During the corrosion process, ferrite dissolves preferentially, leaving carbide particles behind. The residual carbide particles may promote the nucleation of FeCO3 crystal. The phase comprising of the inner layer is Cr compound, and the one of the outer layer is FeCO3. The formation process of corrosion scale can be illustrated as follows： Firstly, a thin scale consisting of thin inner layer and outer layer is formed, which represents poor corrosion resistance; then, the inner layer changes little, once it has been formed, and the outer layer becomes thick and compact, which demonstrates that a fine corrosion resistance is obtained. The chemical elements of chromium and molybdenum accumulate in the inner layer of corrosion scale. The corrosion behavior of low- alloy steel based on microstructure and morphology characterization is also discussed.

关键词： Carbon dioxide low-alloy steel Corrosion behavior Microstructure