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Effect of controlled rolling on the martensitic hardenability of dual phase steel

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 165-169页

作者： Mohammad Ajmal Masood Ahmed Tindyala Ron Priestner Department of Metallurgical & Materials Engineering University of Engineering & TechnologyG.T. Road Lahore-54890Pakistan Manchester Materials Science Center University of Manchester Institute of Science and Technology (UMIST)ManchesterM1 7HSUK

The C-Mn and C-Mn-Nb steels were thermo-mechanically processed to develop dual phase steel and to study the effect of controlled rolling on the martensitic hardenability of austenite. The steel specimens were intercritically annealed at 790℃, rolled at that temperature to the reductions of 10%, 23%, and 47% and immediately cooled at different rates. Quantitative metallography was used to construct the microstructure map, which illustrated that increasing deformation progressively reduced the proportion of new ferrite formed at all cooling rates and increased the amount of martensite at fast and intermediate rates. The martensitic hardenability of austenite remaining after all the rolling reductions was plotted as a function of cooling rates. It was observed that for the austenite-martensite conversion efficiencies greater than about 25%, controlled rolling increased the martensitic hardenability of austenite.

关键词： controlled rolling dual phase steel intercritical annealing hardenability phase transformation

Improvement of Grain Size and Dome Height of Microalloyed Steels Using Taguchi Method Based on Grey Relational Grade in controlled rolling

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Journal of Iron and Steel Research International 2013年第12期20卷 115-123页

作者： Mohsen Ayaz Daavood Mirahmadi Khaki Nasrollah Bani Mostafa Arab Department of Mechanical Engineering Shahid Rajaee Teacher Training University Department of Materials Engineering Shahid Rajaee Teacher Training University

An efficient approach was introduced for improving the condition of major controlled rolling process pa- rameters of roughing, finishing and coiling temperatures and optimizing these parameters to obtain minimum grain size and maximum dome height simultaneously. Taguchi method combined with grey relational analysis was applied to achieve optimum grain size and dome height during controlled rolling process. For this purpose, four levels for the above temperatures were chosen and sixteen experiments were conducted based on orthogonal array of Taguchi meth- od. Based on Taguchi approach, signal-to-noise （S/N） ratios were calculated and used in order to obtain the opti- mum levels for every input parameter. Analysis of variance revealed that finishing and coiling temperatures have the maximum effect on the grain size and dome height of microalloyed steels. The confirmation tests with the optimal levels of parameters indicated that the grain size and dome height of controlled rolled microalloyed steels can be im- proved effectively through this approach.

关键词： controlled rolling microalloyed steel dome height grain size Taguchi method grey relational grade

Austenite Recrystallization and controlled rolling of Low Carbon Steels

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Journal of Iron and Steel Research International 2006年第3期13卷 31-35,50页

作者： DU Lin-xiu ZHANG Zhong-ping SHE Guang-fu LIU Xiang-hua WANG Guo-dong State Key Laboratory of rolling and Automation Northeastern University Shenyang 110004 Liaoning China

The dynamic recrystallization and static recrystallization in a low carbon steel were investigated through single-pass and double-pass experiments. The results indicate that as the deformation temperature increases and the strain rate decreases, the shape of the stress-strain curve is changed from dynamic recovery shape to dynamic recrystallization shape. The austenite could not recrystallize within a few seconds after deformation at temperature below 900 ℃. According to the change in microstructure during deformation, the controlled rolling of low carbon steel can be divided into four stages： dynamic recrystallization, dynamic recovery, strain-induced ferrite transformation, and rolling in two-phase region. According to the microstructure after deformation, the controlled rolling of low carbon steel can be divided into five regions： non-recrystallized austenite, partly-recrystallized austenite, fully-recrystallized austenite, austenite to ferrite transformation, and dual phase.

关键词： recrystallization low carbon steel austenite strain-induced transformation controlled rolling

STRAIN-INDUCED ISOTHERMAL PRECIPITATION OF Nb,V AND Ti CARBONITRIDES IN MICROALLOYED STEELS DURING controlled rolling

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Acta Metallurgica Sinica(English Letters) 1989年第3期2卷 174-180页

作者： XU Wenchong MA Xiang SUN Fuyu ZONG Guisheng Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China XU Wenchong,Senior Engineer,Department No.13,Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China

The strain-induced isothermal precipitation and the law of coarsening of Nb,V and Ti carbonitrides in ***-V steel and Ti-V-Nb steel have been investigated systematically by means of STEM,EDAX,a new extraction replica ... 详细信息

关键词： microalloyed steels controlled rolling isothermal precipitation carbonitride

Effect of rolling Process on Microstructure and Properties of 95CrMo Drill Steel

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Journal of Iron and Steel Research International 2016年第9期23卷 910-923页

作者： Wei YU Bao-sheng XIE Ban WANG Qing-wu CAI Shi-xin XU National Engineering Research Center of Advanced rolling University of Science and Technology Beijing Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing

In order to improve the strength and toughness of 95CrMo steel and explore a short flow process, a direct rolling process was employed, and the effect of finishing rolling process on microstructure and mechanical properties was investigated. The results show that, with the decrease of finishing rolling temperature, inter-lamellar spacing in- creases, the strength as well as hardness has a general increase, and secondary cementite is distributed uniformly but represents a remarkable decrease in size. Based on Hall-Petch type equation, an effective relationship of yield strength and pearlite structure parameters was established. The correlation coefficients between the measured and calculated strength were more than 0.95, which indicated a high reliability of the relationship. By analyzing the individual strength contributions of pearlite structures, yield strength was found to have a more great dependence on pearlite inter-lamellar spacing than colony size.

关键词： pearlitic steel controlled rolling controlled cooling microstructure mechanical property strength model

Study on Heat Treatment Process of AB/EQ56 Steel Plate

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Journal of Iron and Steel Research International 2011年第S1期18卷 978-982页

作者： ZHANG Zhi-jun,YU Zhong-xin,YANGYue-hui (Wuyang Iron and Steel Co.,Ltd.,Wuyang 462500,Henan,China) Wuyang Iron & Steel Co Ltd Wuyang 462500 Henan Peoples R China

The article mainly describes the development process of AB/EQ56 steel plate for ocean engineering with thickness ≤50mm in Wuyang Iron and Steel Co.,Ltd.(Wugang),and studies the chemical analysis,metallographic structure,tensile strength and serial temperatures impact toughness of the steel *** results show that a good match of strength and toughness of AB/EQ56 steel plate with thickness ranging from 12mm to 95mm produced by ultra low alloying component control,controlled rolling and controlled cooling,proper quenching and tempering process,of which the properties are all conforming to the requirements of ABS *** steel plate has passed the certification of ABS and is qualified for *** than 7000 tons of such steel plate have been ordered,which mainly apply for the cantilever beam of offshore oil platform.

关键词： low alloy composition design controlled rolling quenching process microstructure property

A NEURAL NETWORK-BASED MODEL FOR PREDICTION OF HOT-ROLLED AUSTENITE GRAIN SIZE AND FLOW STRESS IN MICROALLOY STEEL

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 521-530页

作者： J. T.Niu,L.J.Sun and P.Karjalainen 1) Harbin Institute of Technology, Harbin 150001, China 2) University of Oulu, FIN-90571, Oulu, Finland

For the great significance of the prediction of control parameters selected for hot-rolling and the evaluation of hot-rolling quality for the analysis of prod uction problems and production management, the selection of hot-rolling control parameters was studied for microalloy steel by following the neural network principle. An experimental scheme was first worked out for acquisition of sample data, in which a gleeble-1500 thermal simolator was used to obtain rolling temperature, strain, stain rate, and stress-strain curves. And consequently the aust enite grain sizes was obtained through microscopic observation. The experimental data was then processed through regression. By using the training network of BP algorithm, the mapping relationship between the hotrooling control parameters (rolling temperature, stain, and strain rate) and the microstructural paramete rs (austenite grain in size and flow stress) of microalloy steel was function appro ached for the establishment of a neural network-based model of the austeuite grain size and flow stress of microalloy steel. From the results of estimation made with the neural network based model, the hot-rolling control parameters can be effectively predicted.

关键词： microalloy steel controlled rolling austenite grain size flow stress neural network BP algorithm

Research on the SUS304 hot-rolled austenitic stainless steel strip by TMCP

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Baosteel Technical Research 2009年第2期3卷 36-41页

作者： HAN Jian HE Shen WANG Zhiyu JIANG Laizhu Technology Center for Stainless Steel Baosteel Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200431 China

To avoid intergranular corrosion and obtain microstructural homogenization, the conventional SUS304 austenitic stainless steel needs to be solution annealed after hot rolling. This study investigates the thermal-mechanical controlled process （TMCP） of SUS304 steel, especially the controlled rolling and online accelerated cooling procedures. The objective of this research is to reduce or even prevent carbide precipitation based on the description of the time- temperature-precipitation （TTP） curve. The dynamic and post-dynamic recrystallization behaviors of this steel ensured the homogenization of grains in this process due to, which was studied by the hot compression tests. The microstructure and the properties of the TMCP-produced SUS304 steel strip were compared with the conventional method of solution annealing. Based on the above results, the newly developed TMCP-produced SUS304 hot-rolled austenitic stainless steel strip has been successfully produced and it can be directly utilized in the cold rolling process without solution annealing.

关键词： austenitic stainless steel the thermo-mechanical control process controlled rolling online acceleratedcooling

Research on TMCP technology for the manufacture of SUS 304 L austenitic stainless steel plates

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Baosteel Technical Research 2009年第4期3卷 56-60页

作者： WANG Zhiyu HAN Jian JIANG Laizhu Technology Center for Stainless Steel Research Institute Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200431 China

Two thermo-mechanical controlled processes （TMCP） including controlled rolling and accelerated cooling are proposed for the production of heavy gauge SUS 304 L austenitic stainless steel plates with different strengths and other characteristics. Based on the recrystallization mechanism and carbide precipitation behavior of SUS 304 L austenitic stainless steel ,TMCP provides a powerful means to control the microstructure and precipitation of the hot rolled steel plate by the controlled rolling and accelerated cooling process. The dislocation density and grain size are the main factors in determining the strength of the stainless steel plates. Therefore ,it is necessary to strictly control the hot rolling parameters, including parameters such as the finish hot rolling temperature in the recrystallization temperature region and the total reduction in the non-recrystallization region. Furthermore, in order to avoid carbide precipitation and guarantee the intergranular corrosion resistance of TMCP SUS 304 L austenitic stainless steel, a critical cooling rate after rolling is determined.

关键词： austenitic stainless steel SUS 304 L TMCP controlled rolling accelerated cooling