THE COLD-ROLLING AND RECRYSTALLIZATION TEXTURES OF IRON-SILICON SINGLE CRYSTALS

研究了取向接近(110)[001]、(320)[001]和(110)[1(?)2]的鉄硅(3.25％ Si)单晶体,在采用不同的压下速率(每軋制一次的压下量)經过60％,70％,80％和85％軋制后的冷軋和再結晶織构。(110)[001]取向的单晶体在采用較低的压下速率軋制退火后,再結晶織构随着压下量增加会从(110)[001]逐漸变化到(310)[001],但采用較高的压下速率軋制退火后,再結晶織构都是(110)[001],并不随压下量增加而改变。改变軋制时的压下速率,对(320)[001]取向单晶体的再結晶織构也有与以上相似的影响,但对(110)[1(?)2]取向单晶体的再結晶織构就沒有明显的影响。分析实驗結果后,认为再結晶織构的形成是一种同位再結晶过程,从这种观点出发,可以滿意地解释再結晶織构随压下速率及压下量改变而变化的規律。     

电脉冲处理下疲劳铜单晶的再结晶

对疲劳后的[1^-23]铜单晶体进行高电流密度脉冲处理可以形成多边形与椭圆形两种再结晶晶粒，晶粒尺寸分别为7．2－8．8μm和5．3－8.0μm。高电流密度脉冲处理造成的位错湮没会增大局部位错分布不均匀区域的位错密度梯度，从而形成再结晶的晶核，由于脉络结构分布均匀，在这一区域形成的再结晶晶粒没有明显的方向性，而在驻留滑移带处于脉冲电流处理的局部温升，增加了位错运动的可能性，导致再结晶晶粒之间间隔一定距离，由于电脉冲作用时间很短，晶粒没有足够的时间长大，从而形成晶粒尺寸较小的再结晶晶粒。     

COLD-ROLLED AND RECRYSTALLIZATION TEXTURES OF TUNGSTEN AND NIOBIUM SINGLE CRYSTALS

研究了(110)[001]、(111)[112]和(320)[001]取向的钨和铌单晶体经70％,80％和85％轧制后的冷轧及再结晶织构。得到了与钼和铁硅单晶体完全一致的结果。从再结晶织构和冷轧织构之间的联系,以及形变带之间的过渡区域在再结晶过程中的作用出发,讨论了再结晶织构的形成,认为再结晶晶核的形成是一个同位再结晶的过程,而再结晶织构形成的普遍规律,可以概括地称为同位再结晶——择优长大。     

RECRYSTALLIZATION OF Al AND Cu SINGLE CRYSTALS AFTER TENSILE DEFORMATION

不同取向的锥形棒状Al和Cu单晶体,在不同温度拉伸后,研究了变形量和变形温度与再结晶晶粒取向之间的关系。发现Al单晶体在-78—300℃拉伸时,当充分进入硬化第三阶段后,再结晶晶粒的取向变得集中,与变形母体间有着沿[1(?))转动30°—50°的晶体学关系,但在-196℃拉伸后,再结晶的取向是混乱的。Cu单晶体在20—400℃拉伸后,再结晶的取向也是混乱的。从再结晶晶核就是回复过程中处于领先的、并与周围母体取向差别较大的亚晶长大而成的讨论出发,考虑到Al和Cu的层错能不同,以及Al的层错能随温度降低而减小的现象,并与不同形变硬化阶段的变形机理及变形后的结构相联系,可以对这种再结晶取向关系作出解释。     

EFFECT OF SILICON ADDITION ON RECRYSTALLIZATION AND PHASE TRANSFORMATION BEHAVIOR OF HIGH-STRENGTH HOT-ROLLED TRIP STEEL

Because Si is a noncarbide forming element, a multiphase microstructure consisting of ferrite, bainite, and retained austenite, at room temperature, can be formed by controlling the thermomechanical process strictly. The cooling schedules must be restricted by the formation of pearlite and cementite. In the present article, a new integrated mathematical model for prediction of microstructure evolution during controlled rolling and controlled cooling is developed for a typical kind of low carbon Si-Mn TRIP steel, which consists of temperature simulation, recrystallization, and transformation models. The influence of Si contents has been thoroughly investigated. The calculated results indicate that Si retards recrystallization, restrains austenite grain growth as well as accelerates polygonal ferrite transformation.     

COLD-ROLLING AND RECRYSTALLIZATION OF (110)[110] IRON-SILICON SINGLE CRYSTALS

After70-90% cold-rolling,strong{111}〈110〉and weak {111},〈112〉 cold-rolled tex- tures and perfect{111}〈112〉 recrystallization texture were obtained in Fe-Si single crys- tals.The cold-rolled textures with different orientations possesses different ability for recov- ery because of the difference of dislocation structure and store energy alter cold-rolling.The recovery taking place at{111}〈112〉orientation region was prior to that at{111}〈110〉 orientation region.hese subgrains with{111}〈112〉 orientation became recrvstallization nuclei during their growth at expending the surrounding matrix which was sluggish in recovery process.The development of recrystallization textures may be suggested as a process of “nucleation in-situ-selective growth”.The formation of(111)textures in low carbon steel sheets has been discussed in the light of this suggestion.     

(110)[110]Fe-Si单晶体的冷轧和再结晶

研究了(110)[110]Fe-Si单晶体的冷轧和再结晶。经过70—90%冷轧后,得到了强的{111}〈110〉和弱的{111}〈112〉加工织构,退火后得到了集中的{111}〈112〉再结晶织构。冷轧变形后,{111}〈112〉取向的地区比{111}〈110〉取向的地区先发生回复,{111}〈112〉取向的亚晶吞并滞后回复的地区而长大,成为再结晶晶核。这种再结晶织构的形成过程,可以概括地称为同位成核-选择生长。     

ROLLING TEXTURES AND RECRYSTALLIZATION TEXTURES IN IRON SILICON ALLOYS

本文研究了含矽量为4.15%,2.9%和3.35%的矽钢片的加工结构和再结晶结构。用X射线测定极图的结果证明:在所有合金中,当最后冷轧轧下量大于60%时,其加工结构是(001)[110],(112)[(?)]及(111)[(?)]。退火后的初次再结晶结构是(001)[110]绕[001]轴旋转0°—30°,(111)[(?)]及(110)[001]。本文还研究了再结晶结构的形成过程,借以了解它的形成机构。结果表明:(1)再结晶结构(001)[110]绕[001]轴旋转0°—30°是通过“同位再结晶”(recrystallizatton in-situ)的过程,然后围绕垂直于压延平面的轴旋转而成。(2)再结晶的最初阶段的(110)[001]结构与加工结构(111)[(?)]在数量上有对应的关系,因此,我们认为用定向生核理论来解释(110)[001]的形成较为适当。在几何关系上,前人曾指出,再结晶结构(110)[001]可认为是由加工结构(111)[112]绕〈110〉轴旋转35°而来,这个观点是与本文结果符合的。(3)在退火过程中,加工结构的消失具有一定顺序:(111)[(?)]最先消失,(001)[110]最后消失。某一加工结构的再结晶本领并不决定于它的相对数量的多少,而是决定于该结构的类型。在含矽量为2.9%的样品中,经一系列的加工及热处理后,获得了发展良好的第二次再结晶结构(110)[001],其偏离度为15°(110)[001]结构即一     

THE RECRYSTALLIZATION AND MAGNETIC PROPERTIES OF ARMCO IRON

对国产工业纯铁在冶轧和热炼后的显微组织和磁性初步进行了试验。所用材料的轧制和再结晶结构已试测过,并叙述于前两篇报告里。具有较高的磁导率值的试样呈现二次再结晶.试样的再结晶组织和磁性的关系于本篇中作了简单的讨论.     

THE PLASTIC DEFORMATION OF ANTIMONY SINGLE CRYSTALS

純度为99.8％的銻单晶体在室溫拉伸很脆,孿生表現为主要的形变机构。在200℃拉伸时,范性显著增加,在金相显微镜下观察到滑移线。用金相和X射线方法定出孿生面K_1为{011}面,孿生方向η1为<100>,滑移面为(111)面。     

取向硅钢初次再结晶组织结构的研究

研究了取向硅钢在初次再结晶过程中的组织和结构变化,包括晶粒长大情况、取向差、重合位置点阵(CSL)及织构的变化。研究表明,820℃盐浴再结晶退火3 s时即完成再结晶,随即发生晶粒长大。在初次再结晶的开始阶段,主要织构是{111}112、{100}110和弱的高斯织构;随着退火时间增加,{100}110织构和高斯织构逐渐减弱,{111}112织构先增强后减弱,并向{111}110和{111}231转化,退火3 min以后出现的{012}001织构是一种促进二次再结晶发展并最终有利于提高二次再结晶磁感和降低铁损的织构。退火时间增加到3 min以后,CSL的∑3晶界比例增加。退火时间增加到30 min时,CSL的∑1晶界比例增加,同时,小角度晶界比例提高,大角度晶界减少。     

A STUDY ON THE DEFORMATION AND PRIMARY RECRYSTALLIZATION TEXTURE IN A MnS-AlN-INHIBITED 3% SILICON STEEL

本文介绍了用X射线和蚀坑方法研究含MnS-AlN为抑制相的3％Si-Fe合金形变和初次再结晶织构。与MaS为抑制相的3％Si-Fe不同,含MnS-AlN的3％Si-Fe的热轧织构主要是由{112}<110>,{111}<110>,{100}<110>和{111}<112>组分构成。研究中曾发现在80—87％冷轧压下率范围内冷轧织构同热轧织构具有“继承性”联系。冷轧时超过87％压下后织构将向(100)[011]稳定位向转变,后者显然对磁性不利。文中还对热轧、冷轧和初次再结晶织构的转变关系作了讨论。     

周期热轧管精度研究

建立工艺过程自动控制系统提高周期轧管机轧制的钢管壁厚精度。     

CYCLC DEFORMATION OF Nb SINGLE CRYSTALS

The Nb single crystals of both[321]and[110]orientations have been cyclicly deformed intension-compression at constant strain rate 8×10~(-4)s~(-1)over a range of plastic strainamplitudes between 10~(-3)and 10~(-4).The cyclic hardening,the changes in shape of crystals andthe asymmetry of stress have been studied.The hardening curve can be divided into threestages,i.e.first,rapid-hardening and saturated stage.In the first stage of cyclic hardening curve dominant features of dislocation configura-tions are high density networks and debris loops.In the rapid-hardening stage the main fea-ture is the formation of dislocation bundles.In the saturated a well defined bundle structurefully develops and between them it is filled with only screw dislocations and the imposed strainis accommodated mainly by the motion of screw dislocations travelling to and from betweenthe bundles.Three-dimension cell,two-dimension cell or bundle structures are summarized asthe saturated structures of bcc metals.     

单晶铌的循环变形研究

本文系统地研究了Nb单晶循环变形的应力-应变关系及位错组态。和单向变形相比较,单晶在循环变形后都有应力不对称现象,拉伸时的应力小于压缩时的应力。循环硬化曲线可以分成三个阶段:初始阶段、快速硬化阶段和饱和阶段。初始阶段位错组态为密集的位错网络和碎块状的位错圈。快速硬化阶段出现条带状的位错缠结。饱和阶段的位错组态为条带和条带之间的螺位错,塑性变形主要通过条带间的螺位错往复运动来实现。     

STUDY OF Ag DIFFUSION INTO Cu SINGLE CRYSTALS BY RUTHERFORD BACKSCATTERING SPECTROMETRY

4.0Me V 7Li++ RBS was used for investigations of thermal diffusion of Ag in Cu single crystals. The annealing of samples was carried out in vacuum in the temperature range from 498K to 613K. The element depth concentration profiles transformed from RBS spectra indicate that the diffusion of Ag into Cu is a typical volume diffusion. The Arrhenius parameters corresponding to the diffusion were obtained.     

Al—Li单晶体锯齿流变的产生机制

不同时效状态下Ａｌ－Ｌｉ单晶体应变速率敏感性的变化不同。单个锯齿的应力幅度随应变的增加不规则变化,和锯齿的经历时间无关;锯齿的应力幅度和经历时间在峰值时效状态主要分布在较小值的范围内。这些变化可以用切割δ’粒子产生锯齿流变解释。     

A STUDY OF THE EQUILIBRIUM OF Ce-S-O IN MOLTEN IRON

用直接法研究1600℃时溶铁中Ce-S-O平衡关系,测定了Ce的脱氧、脱硫、脱硫氧常数,并进行了有关的热力学探讨.由测得数据算出Ce的溶解自由能(△G_溶~0);活度系数(γ_(Ce)~0);克原子分数和百分浓度的交互作用系数ε_(Ce)~(Ce),e_(Ce)~(Ce);生成Ce_2O_2S的自由能△G_(Ce_2O_2S)~0.