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Dynamic Recrystallization and Precipitation Behavior of Mn-Cu-V Weathering Steel

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Journal of Materials Science & Technology 2011年第12期27卷 1131-1138页

作者： Hongyan Wu linxiu du Xianghua Liu State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

The hot deformation behavior of a Mn-Cu-V weathering steel was investigated at temperatures ranging from 850 to 1050℃ and strain rates ranging from 0.01 to 5 s-1 using MMS-300 thermal-mechanical simulator. The activation energy for dynamic recrystallization and stress exponent were calculated to be 551 kJ/mol and 7.73, respectively. The accurate values of critical strain were determined by the relationship between work hardening rate and flow stress （θ-σ） curves. The hyperbolic sine constitutive equation was employed to describe the relationship between the peak stress and Zener-Hollomon parameter during hot deformation. The interaction between dynamic recrystallization and dynamic precipitation of V（C,N） at a low strain rate was analyzed. The results showed that precipitation particles size of weathering steel increased with increasing strain at deformation temperature g50~C and strain rate 0.1 s-I. The calculation results of the recrystallization driving force and pinning force showed that dynamic precipitation could retard the progress of dynamic recrystallization but not prevent it while the pinning forces is less than driving force. On the contrary, dynamic precipitation can effectively prevent the progress of dynamic recrystallization.

关键词： Weathering steel Critical strain Dynamic recrystallization Dynamic precipitation

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含Ti耐候钢在海洋环境中的腐蚀行为

热加工工艺 2024年第17期53卷 55-58页

作者：翁镭吴红艳杜林秀东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110819

为研究高钛含量耐候钢在海洋环境下的腐蚀机理,采用周期浸润加速腐蚀设备,对两种不同Ti含量的耐候钢进行了腐蚀行为研究。腐蚀实验后,测量了腐蚀减薄量。然后用数码相机和扫描电镜(SEM)对表面腐蚀产物的宏观和微观形貌进行观察。采用电... 详细信息

为研究高钛含量耐候钢在海洋环境下的腐蚀机理,采用周期浸润加速腐蚀设备,对两种不同Ti含量的耐候钢进行了腐蚀行为研究。腐蚀实验后,测量了腐蚀减薄量。然后用数码相机和扫描电镜(SEM)对表面腐蚀产物的宏观和微观形貌进行观察。采用电子背散射衍射(EBSD)方法分析钢中大小角度晶界对初期腐蚀行为的影响。结果表明:在近似晶粒尺寸条件下,钢中Ti元素有助于提高抗海洋环境腐蚀性能,但是Ti含量的增加使小角度晶界、Σ3晶界和Σ7晶界比例下降,Ti含量在一定范围内有利于耐候钢表现出更好的耐蚀性。

关键词：耐候钢小角度晶界重位点阵

Enhanced mechanical stability of ultrafine grained steel through intercritical annealing cold rolled martensite

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Acta Metallurgica Sinica(English Letters) 2012年第6期25卷 443-452页

作者： Huifang LAN Xianghua LIU linxiu du The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

The ultrafine grained ferritic steels possess shortage of work hardening. Fine grained high strength but low ductility due to the ferrite-martensite dual phase microstruc- ture was obtained in a microalloyed steel and low carbon steels through intercritical annealing of the cold rolled martensite. The dual phase microstructure was uniform and the ferrite grain size was smaller in the microalloyed steel resulted from the pin- ning effect of microalloyed precipitates. But ferrite grown apparently and the volume fraction of the martensite was much higher without the addition of microalloying el- ements. By introducing martensite into the fine grained ferrite, the work hardening was effectively improved, leading to better mechanical stability. As a result of the fine ferrite grain size as well as uniform distribution of the martensite, the work harden- ing was enhanced, showing better strength-ductility balance in the microalloyed dual phase steel.

关键词： Mechanical stability Fine grained dual phase steel Work hardening Strength-ductility balance

Effect of Rolling Process on Comprehensive Properties of Corrosion Resistant Steel for Bottom Plate of Cargo Oil Tanks

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Journal of Wuhan University of Technology(Materials Science) 2016年第2期31卷 379-386页

作者：于驰王平 GAO Xiuhua du linxiu Key Laboratory of National Education Ministry for Electromagnetic Processing of Materials Northeastern University Shenyang 110819 China The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

A new kind of corrosion resistant steelfor cargo oiltanks（COT）was *** influences of finalrolling temperature,cooling rate,and finalcooling temperature on microstructure were *** proper rolling process parameters were obtained through multi-pass thermalsimulation *** finalrolling temperature is about 820 ℃,the finalcooling temperature is about 600 ℃,and the cooling rate should be controlled between 10 ℃/s and 20 ℃/*** on the above analysis of the results,three groups of rolling samples by thermo mechanicalcontrolprocess are *** tensile strength,yield strength,and toughness of the corrosion resistant steelare measured,which meet the requirements of DH36 steel,it can instruct the actualrolling *** corrosion behaviour is also researched by weight loss and electrochemicalimpedance spectroscopic method,and it is found that the steelhas good corrosion resistance performance,the best one is No.3 steel,the corrosion rate of which is about 1/4 of the accepted criterion.

关键词： rolling process corrosion resistant steel comprehensive properties corrosion rate

Microstructure and mechanical properties of X80 pipeline steels in different cooling schedules

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Acta Metallurgica Sinica(English Letters) 2010年第3期23卷 171-175页

作者： Min ZHOU linxiu du Xianghua LIU State Key Laboratory of Rolling Technology and Automation Northeastern University Shenyang 110819 China

The microstructures and mechanical properties of three X80 pipeline steel plates were investigated in this *** plates were hot rolled by two stages, and cooled by three different cooling schedules to obtain different microstructures and mechanical *** electron microscope（TEM） was used to observe the *** results indicated that the amount of polygonal ferrite（PF） and quasi-polygonal ferrite（QPF） decreased with decreasing of the finish cooling temperature（FCT）, while the amount and size of M-A islands were *** promoted the Charpy V-notch（CVN） impact toughness at-20℃, but not the drop weight tear testing（DWTT） property at-15℃, and decreased the strength of the steel.

关键词： Microstructure Mechanical properties Cooling schedule Relaxation

Growth behavior of ultrafine austenite grains in microalloyed steel

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Acta Metallurgica Sinica(English Letters) 2009年第1期22卷 7-12页

作者： linxiu du Shengjie YAO Xianghua LIU Guodong WANG State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China

Ultrafine austenite gains （UFAGs） with size of 1-5 μm were prepared through repetitive treatment, four times, of rapid heating and quenching, and the growth behaviors of these UFACs during both the reheating and cooling stages were investigated. The results indicated that UFAGs without pinning particles appeared with significant coarsening when the reheating temperature reached 1000 ℃. Although coarsening still occurred in the cooling stage, the growth was obscured during the isothermal holding process at temperatures between 900 ℃ and At3.

关键词： Ultrafine austenite grain Growth Microalloyed steel Second-phase particle

Relationship between microstructure and hydrogen induced cracking behavior in a low alloy pipeline steel

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Journal of Materials Science & Technology 2017年第12期33卷 1504-1512页

作者： Jing Li Xiuhua Gao linxiu du Zhenguang Liu State Key Laboratory of Rolling and Automation Northeastern University5henyang 110819China

Hydrogen induced cracking（HIC） behaviors of a high strength pipeline steel with three different microstructures, granular bainite ＆ lath bainite（GB ＋ LB）, granular bainite ＆ acicular ferrite（GB ＋ AF）, and quasi-polygonal ferrite（QF）, were studied by using corrosion experiment based on standard NACE TM0284. The HIC experiment was conducted in hydrogen sulfide（H_2S）-saturated solution. The experimental results show that the steel with GB ＋ AF and QF microstructure present excellent corrosion resistance to HIC, whereas the phases of bainite lath and martensite/austenite in LB ＋ GB microstructure are responsible for poor corrosion resistance. Compared with ferrite phase, the bainite microstructure exhibits higher strength and crack susceptibility of HIC. The AF ＋ GB microstructure is believed to have the best combination of mechanical properties and resistance to HIC among the designed steels.

关键词： Pipeline steel Microstructure Hydrogen induced cracking (HIC) Corrosion resistance

Static Recrystallization and Precipitation Behavior of a Weathering Steel Microalloyed with Vanadium

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Journal of Materials Science & Technology 2013年第12期29卷 1197-1203页

作者： Hongyan Wu linxiu du Zhengrong Ai Xianghua Liu State Key Laboratory of Rolling and Automation Northeastern University

The static recrystallization （SRX） and precipitation behavior of a weathering steel microalloyed with vanadium were investigated through double-pass compression tests under controfled conditions using the MMS-300 thermal-mechanical simulator. The deformation temperatures ranged from 800 °C to 1000 °C, and the inter- pass time from 1 s to 500 s. The simulation results showed that SRX occurred after 5-10 s at the first compression deformation. The softening fraction of SRX was found to increase with increasing the deformation temperature and the pre-strain. However, the softening fraction scarcely changed during the process of strain-induced precipitation. In addition, the kinetics of SRX was described by the Avrami equation, and the Avrami exponent appeared to be closely associated with the deformation temperature. The microstructure evolution was investigated at the initiation and completion of recrystallization. The amount and distribution of the precipitates were analyzed. The relationship between the driving force of SRX and the pinning force of precipitation was discussed. Besides, the recrystallization inhibition was detected at the early stage of precipitation, and the pinning forces were found to be of a magnitude comparable to the driving force. Moreover, the pinning forces were found to increase with the degree of precipitation and reach a peak at the intermediate stage of precipitation, and finally reduce as the particles coarsened.

关键词： Vanadium-microalloyed weathering steel Static recrystallization Kinetics of SRX Microstructural evolution Precipitation

轧后控冷工艺对75Cr1钢球化退火组织性能影响的研究

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轧钢 2024年第3期41卷 35-41,47页

作者：任泽飞王润琦吴红艳杜林秀东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110819

针对锯片用钢高强度、良好的韧性和耐腐蚀性能,以及较高的淬透性和热稳定性的性能要求,研究了热轧后控冷工艺对75Cr1钢球化退火后显微组织和力学性能的影响;采用电子探针显微分析仪(EPMA)和透射电镜(TEM)对实验钢热轧及球化退火后的显... 详细信息

针对锯片用钢高强度、良好的韧性和耐腐蚀性能,以及较高的淬透性和热稳定性的性能要求,研究了热轧后控冷工艺对75Cr1钢球化退火后显微组织和力学性能的影响;采用电子探针显微分析仪(EPMA)和透射电镜(TEM)对实验钢热轧及球化退火后的显微组织进行了表征。结果表明:通过不同热轧控冷工艺,获得了片层状珠光体、珠光体+铁素体、珠光体+贝氏体3种热轧态组织实验钢板。当热轧后实验钢板组织为片层状珠光体时,球化退火后渗碳体颗粒分布均匀,钢板屈服强度和抗拉强度分别为473 MPa和556 MPa。当热轧组织中存在铁素体组织时,球化后渗碳体颗粒出现了聚集现象,晶粒尺寸增大,钢板强度降低。当热轧后实验钢板组织出现贝氏体时,缩短了球化过程中碳原子的扩散距离,获得了良好的球化组织,钢板的屈服强度和抗拉强度分别为553 MPa和638 MPa。对不同热轧组织钢板球化退火效果进行对比分析可知:将实验钢板的热轧终冷温度控制在约510℃时,产生贝氏体组织,相较于片层状珠光体组织以及铁素体+珠光体组织更易于获得良好的球化退火组织。

关键词： 75Cr1锯片钢热轧工艺球化退火渗碳体珠光体力学性能