中碳钢板坯保护渣玻璃质渣膜脱玻化

 连铸保护渣玻璃质渣膜回温脱玻化过程对实际渣膜的热阻有重要影响，本文对中碳钢板坯连铸常规拉速保护渣和优化的高拉速保护渣制备玻璃质渣膜并在不同温度下进行了退火处理试验，结果表明：经过处理的玻璃质渣膜发生了脱玻化现象，析出晶体相主要为枪晶石；随着处理温度的提高，渣膜结晶度增加；高结晶温度的保护渣具有较强的脱玻化能力，且脱玻化温度较低；具有较高结晶温度的保护渣更易形成热阻较大的渣膜，有利于中碳钢板坯高速连铸时减缓结晶器传热。     

热轧H型钢的高应变低周疲劳性能研究

 对热轧H型钢的高应变低周疲劳性能进行了研究。采用轴向应变控制的方法，在Instron-1342型电液伺服疲劳试验机上测定了热轧H型钢的低周疲劳性能数据，研究了在循环载荷下材料的循环应力响应特征、循环应力与应变关系，并用Coffin-Manson公式拟合得到热轧H型钢的疲劳寿命计算公式，据此计算了 =100时的 值。通过断口扫描发现，裂纹不仅在试样表面处形核，同时也在试样内部杂质处形核，然后通过不断的扩展形成微裂纹，许多微裂纹通过扩展连接形成宏观裂纹，最终导致材料断裂。     

《检修安全确认》与《岗位危害辨识》"两制"在硫酸厂的推行

结合企业实际,对<检修安全确认>与<岗位危害辨识>在企业中的推行进行理论分析和实践中的运作评价.探索出更加适合企业安全生产工作的"两制"内容,充分体现<检修安全确认>与<岗位危害辨识>的理论性与实践性在安全生产中的重要作用.     

氧化铝生产中氢氧化铝洗涤探讨

本文探讨了在氧化铝生产中氢氧化铝洗涤用水量和洗涤次数的关系,推导出了理论用水量的方程式X=b[（c/a&#215;w%）^n1-1]&#215;（1-w%）^-1&#215;η^-1和限定用水量条件下的洗涤次数方程n=1g[c&#215;（a&#215;d%）^-1 1/lg[X&#215;（1-w%）&#215;η＋b）&#215;b^-1],并探讨了洗涤次数的合理范围以及影响洗涤水用量的因素。     

云南老王寨金矿床微量元素和同位素组成及对成矿物质来源的限定

云南老王纂金矿床的玄武岩、矿化玄武岩,煌斑岩、矿化煌斑岩的Au、Ni、Cu等微量元紊不同步富集,表明金不是在玄武岩和煌斑岩岩浆和热液作用过程中富集的。矿化围岩的金相对富集程度高,铜、铅、锌、银的相对富集程度低。矿化玄武岩的δ¹⁸O值为10.5‰,玄武岩的δ¹⁸O值为8.7‰,铜、铅、锌、银的相对富集程度高,铜、铅、锌、银的相对富集程度低。矿化玄武岩的δ¹⁸O值为10.5‰玄武岩的δ¹⁸O 值为8.7‰ ;含少量黄铁矿的矿化煌斑岩的δ¹⁸O值为14.7‰ ,弱蚀变煌斑岩的δ¹⁸O值为11.2‰,最强烈矿化煌斑岩δ¹⁸O 值为11.1‰ ;表明矿化流体不是大气降水成因的流体,成矿作用后期,大气降水成因的流体加入矿化热液体系。热液方解石锶同位翥韧始值( ⁸⁶Sr/⁸⁷Sr)．,为0 21 2123=30,Nd同位紊组成的现今比值相对于CHUR 地幔源中Nd同位紊组成现今比值的万分偏差￡_Nd(0)为1.14,相对于方解石形成时CHUR 地幔源分馏沉淀程度的参数f_{Sn Nd}为0.1 3,与海洋环境下形成的玄武岩一致。     

Texture of Hot Rolled Strip for Fe-3Si Steel Produced by Thin Slab Casting and Rolling

 Fe-3%Si steel strip was experimental produced by thin slab casting and rolling (TSCR) process in the laboratory. The microstructure and texture of hot rolled strip by different total reduction and rolling schedule was observed through EBSD technique and X-ray diffraction method. The changeable rule of texture density on the α、ε and γ, and fibers was analyzed. When the total reduction was increased from 82.9% to 97.1%,the gradient of microstructure and texture for A steel surface layer and center layer was found, {001}&;#8249;110&;#8250; texture had higher intensity, and {001}&;#8249;110&;#8250; texture was changed to     

带肋钢筋双切分轧制导卫的改进

1问题的提出 棒线厂目前有3条生产线,设计总生产能力为150万吨／年。一棒为全连续棒材生产线,设计年产50万吨,设有：粗轧机组Ф560&#215;4／Ф475&#215;3、中轧机组Ф410&#215;6、精轧机组Ф350&#215;6;二棒设计年产60万吨,设有：粗轧机组Ф610&#215;6、中轧机组Ф410&#215;6、精轧机组Фb350&#215;6;     

国家重点行业清洁生产技术导向目录

第一批：干熄焦技术;高炉富氧喷煤工艺;小球团烧结技术;烧结环冷机余热回收技术;烧结机头烟尘净化电除尘技术;焦炉煤气HPF法脱硫净化技术;石灰窑废气回收液态CO2;尾矿再选生产铁精矿;高炉煤气布袋除尘技术;LT法转炉煤气净化与回收技术;LT法转炉粉尘热压块技术;轧钢氧化铁皮生产还原铁粉技术;锅炉全部燃烧高炉煤气技术。     

BeSecure反垃圾邮件模块

部署位置：Web／网络网关处;在线透明代理;离线路由;ICAP服务器;WCCP客户端。 威胁防护：垃圾信息;钓鱼;恶意软件;混合式威胁。关键优势：将垃圾信息拦截在网关处;减少邮件服务器负载;业界最高的准确率;接近于零的误报率;BeSecure内置的反病毒模块是业界领先的最全面的电子邮件和网页恶意代码保护解决方案;垃圾信息在网关处被拦截,防止邮件服务器IP被列入黑名单;     

全钒氧化还原液流电池电解液的研究

研究在40℃温度下,添加剂对全钒氧化还原液流电池电解液稳定性的影响.通过采用硫酸亚铁铵溶液对钒电池电解液进行电位滴定,定量分析钒电池电解液中不同价态钒离子的浓度;利用循环伏安曲线扫描,分析添加剂的引入对电解液电化学性能的影响.结果表明:温度40℃时,添加剂对五价钒溶液稳定性的影响次序为:尿素>硫酸钾>CTAB>草酸铵>草酸钠;添加剂对钒溶液氧化活性的影响为:草酸钠>尿素>硫酸钾>CTAB>草酸铵;对还原活性的影响为:草酸铵>草酸钠>硫酸钾>CTAB>尿素;对氧化还原反应可逆性的影响为:尿素>草酸钠>硫酸钾>CTAB>草酸铵.     

Effect of Niobium on Dynamic Recrystallization Behavior of 5%Ni Steel

 The single-pass hot compressions of two 5%Ni steels with and without niobium addition at different temperatures of 800-1150 ℃ and strain rates of 0. 01-1 s-1 were performed by using a Gleeble-3500 thermal simulator and the effect of niobium on the dynamic recrystallization (DRX) behavior was analyzed. The results showed that the niobium addition of 0. 04% can retard DRX in 5%Ni steel significantly by increasing the activation energy for DRX from 394 to 462 kJ/mol. The critical strain required for starting DRX in 5%Ni steel was increased by 0. 04-0. 10 with niobium addition when the steel was deformed at a strain rate of 0. 01 s-1 and temperatures varied from 950 to 1000 ℃. The critical temperature required for starting DRX in 5%Ni steel was also increased from 1000 to 1050 ℃ with niobium addition when the steel was deformed at a strain rate of 0. 1 s-1. Such a retarded DRX occurring in Nb-added 5%Ni steel can be attributed to the pinning effect of precipitates containing niobium.     

中温中压容器用钢13MnNiMoR的热变形行为研究

为制定中温中压容器用钢13MnNiMoR的热加工工艺提供理论依据并实现其工业化生产,利用单道次热压缩模拟实验研究了变形温度(900~1150℃)和应变速率(0.01~1s~(-1))对其热变形行为的影响.结果表明:当应变速率低于0.1s~(-1)时,新晶粒有足够的时间进行形核和长大,奥氏体容易发生动态再结晶;当变形温度降低或应变速率增加时,实验钢在变形过程中主要发生动态回复,流变应力也随之提高.基于测定的流变应力曲线,通过拟合得到实验钢在热变形时的应力指数为4.29,动态再结晶激活能为319kJ/mol,据此建立了13MnNiMoR钢在高温变形时的热加工方程.     

Study on dynamic recrystallization behavior of hot rolled TRIP steel produced by CSP process

The dynamic recrystallization behavior of hot rolled TRIP steel produced by CSP process was studied by means of Gleeble-3500 thermal simulation testing machine in the temperature range of 950-1150℃ with the strain rate of 0.1-10s-1 and the strain of 65%. And the effect of initial austenite grain size on the dynamic recrystallization behavior of TRIP steel was explored. The results show that the finer initial austenite grain size, the higher deformation temperature and the lower strain rate, the more positive austenite dynamic recrystallization of TRIP steel. Moreover, it is found that when the coarse grained samples (initial austenite grain size is 767.54μm) deform in the range of 1050℃ to 1150℃, the austenite dynamic recrystallization will take place, and the dynamic recrystallization activation energy of TRIP steel is deduced as 361539.17J/mol. The Zener-Hollomon parameter equation as a function of strain rate and temperature is determined. And the model of critical strain for dynamic recrystallization, the flow stress model of austenite at high temperature and the grain size model for dynamic recrystallization are also established. The calculation results are coincided well with the experimental results.     

Dynamic and Static Recrystallization Behaviour of Coarse-grained Austenite in a Nb-V-Ti Microalloyed Steel简

The dynamic recrystallization （DRX） and static recrystallization （SRX） behaviour of coarse-grained aus- tenite in a Nb-V-Ti microalloyed steel were studied by using a Gleeble thermomechanical simulator. Continuous and interrupted compression tests of coarse-grained austenite were performed in the temperature range of 1000-1 150 ℃ at a strain rate of 0. 1- 5 s 1. The peak and critical strains for the onset of DRX were identified with strain hardening rate analysis, and the ratio of critical strain to peak strain was found to be consistent with the one reported for fine- grained austenite. An equation of the time for 50% softening was proposed by considering the activation energy of steel without microalloying elements and the solute drag effect of microalloying elements. Strain-induced precipitation may not take place at the deformation temperature above 1000 ℃, which indicates that SRX of coarse-grained aus- tenite is mainly retarded by coarse grain size and Nb in solution during rough rolling.     

CSP热轧TRIP钢动态再结晶行为研究

摘要：采用Gleeble-3500热模拟试验机,在温度为950~1150℃、应变速率为0.1~10s-1和变形量为65%的条件下研究了CSP热轧TRIP钢的动态再结晶行为,探讨了初始奥氏体晶粒尺寸对TRIP钢动态再结晶行为的影响。研究结果表明,初始奥氏体晶粒尺寸越小,变形温度越高,应变速率越慢时,TRIP钢中奥氏体越易发生动态再结晶。其中,粗晶试样（初始奥氏体晶粒尺寸为767.54μm）在1050~1150℃内变形时,将发生动态再结晶。其热变形激活能为361539.17J/mol,确定了Zener-Holloman参数与应变速率和温度的关系式,建立了动态再结晶临界应变模型、高温奥氏体流动应力模型和动态再结晶晶粒尺寸模型,理论模拟结果与试验结果吻合较好。     

Hot Deformation Behavior of As-cast AISI M2 High-speed Steel Containing Mischmetal

The hot deformation behavior of as-cast AISI M2high-speed steel containing mischmetal(RE)has been investigated on a Gleeble-3500simulator in the temperature range of 1 000-1 150℃and strain rate range of 0.01-10 s-1 at true strain of 1.0.The mechanical behavior has been characterized using stress-strain curve analysis,kinetic analysis,processing maps,etc.Metallographic investigation was performed to evaluate the mechanism of flow instability.The results show that the deformation activation energy decreases with increasing deformation temperature; the efficiency of power dissipation increases with decreasing strain rate and increasing temperature;flow instability is observed at low-to-medium temperature and higher strain rate region when the strain is smaller,but extends to lower strain rate and high temperature regions with the increment of strain,in which it is manifested as flow localization near the grain boundary.Hot deformation equations and processing maps are obtained.The optimal processing window is suggested and the deformation mechanism is dynamic recrystallization(DRX).     

铸态超级双相不锈钢S32750热变形行为及组织演变

通过Gleeble-3800热压缩实验研究了铸态超级双相不锈钢S32750(/%:0. 017C,0.53Si,0.93Mn,0.023P,0.001S,25.58Cr,7.00Ni,4.03Mo,0.28N)在变形温度为950～1200℃、应变速率为0.1～25/s、真应变为1条件下的热变形行为与组织演变规律。结果表明,超级双相不锈钢S32750热变形行为受变形温度和应变速率的影响明显。在950～1050℃、0.1/s变形时,流变曲线表现出"类屈服平台"特征;当变形温度为1100～1200或应变速率为10/s、25/s时,流变曲线为典型的动态再结晶特征。对其微观组织进行观察发现,铁素体在各变形条件下均发生动态再结晶;奥氏体在950℃和1200℃时基本不受应变速率影响,前者发生动态回复,后者发生动态再结晶。而在1050℃时,受应变速率影响较大:小应变速率下(0.1/s)下发生动态回复,大应变速率下(10/s)发生动态再结晶。     

Hot Deformation Behavior of Nickel-Based Superalloy GH4720Li

 The hot deformation characteristics of GH4720Li alloy were studied at the temperature of 1100-1170 ℃ and strain rate of 001-1 s-1 using Gleeble hot compression tests. True stress-true strain curves and deformation microstructures were investigated. Constitutive equation was established using the hyperbolic law. Processing map for hot working was also developed on the basis of the variations of efficiency of power dissipation with temperature and strain rate. The results show that dynamic recrystallization is the dominant softening mechanism during hot deformation. Fully recrystallized grain is obtained at strain of 07 above 1130 ℃, and coarsening occurs above 1150 ℃. The mean deformation activation energy is determined to be 512 kJ/mol. According to the low activation energy value, high dissipation efficiency parameter and fine recrystallized microstructure, 1130 ℃ is chosen as the hot working temperature for GH4720Li alloy.     

铸态超级双相不锈钢S32750热加工性能

 为研究热变形参数对铸态超级双相不锈钢S32750热变形行为和显微组织的影响,运用Gleeble-3800热模拟试验机对S32750进行不同温度和应变速率下的高温拉伸和压缩试验。结果表明,S32750在1000~1200℃范围内具有较好的热塑性。在变形温度较低、应变速率较低时,流变曲线表现出不同于单相不锈钢的“类屈服平台”特征;当应变速率较高或变形温度较高、应变速率较低时,流变曲线为典型的动态再结晶特征。微观组织演变显示,铁素体和奥氏体两相都发生动态再结晶,且铁素体的再结晶先于奥氏体。降低应变速率,提高变形温度,可促进动态再结晶发生。基于热变形动力学模型建立了本构方程,表观应力指数为3.99,热变形激活能为393.75kJ/mol。S32750的高温软化机制与Zener-Hollomon(Z)参数有关,随Z参数增加,热变形峰值应力增加。     

Hot Deformation Behaviors of S31042 Austenitic Heat-Resistant Steel

 The hot deformation behavior of S31042 austenitic heat-resistant steel was investigated over the temperature range of 900-1200 ℃ and strain rate range of 001-10 s-1 using hot compression tests and the corresponding flow curves were obtained. The hot deformation activation energy of the test steel is 625 kJ/mol. The hot deformation equation and the relationship between the peak stresses, deformation temperature and strain rate were set up. The Zener-Hollomon parameter under various conditions was determined. The relation between the Zener-Hollomon parameter and the microstructure evolution of test steel was discussed. With the decrease of Zener-Hollomon parameter, the microstructure of test steel transforms from deformation instability to dynamic recovery, partial dynamic recrystallization, full dynamic recrystallization with equiaxial structure, and finally to full dynamic recrystallization with mixed crystal structure. The deformation condition can be adjusted easily by utilizing the Zener-Hollomon parameter to obtain equiaxial microstructure.