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Deformation greatly promoted carbonitride isothermal precipitation and made C-curve shift leftwards. The position and shape of C-curve depended on the content of Nb and N to a great extent, C-curve shifted leftwards a little when N content increased and its nose temperature was raised with Nb content increased. 3 when cooling rate increased, start temperature and finish temperature of continuous cooling precipitation decreased, full precipitation became difficult to take place, the volume fraction of carbonitride precipitation decreased, molar fraction of Nb and C dissolved in austenite increased, and the precipitation grain was further refined. Deformation shorten precipitation start time during continuous cooling, raised precipitation start temperature, accelerated precipitation kinetics of carbonitrides.

计算表明:1在Fe—Nb—C系统中,随着温度的降低,析出相的平衡体积分数增加,溶解在奥氏体中的Nb、C的摩尔分数降低,析出相中C和Nb的原子分数的比值v增加;2变形大大促进了碳氮化物的等温析出,使C曲线左移,Nb和N的含量与C曲线的位置和形状有一定的关系,N含量的增加,使C曲线略有左移,而Nb的含量的增加使得C曲线的鼻子区上移;3随着冷却速率的增大,连续冷却析出的开始温度和结束温度均有所降低,并且析出变得越来越不充分,析出相体积分数明显减小,溶解在奥氏体中Nb和C的摩尔分数增大,析出相粒子被明显细化,变形大大缩短了CCP过程碳氮化物析出的开始时间,提高了析出的开始温度,促进了析出动力学。

The research results show that stiffness ratio of superstructure and ratio of damping and stiffness in isolated story have great influence on local deformation of structure. It can reduce the local deformation and increase entirety of structure effectively through rational laying rubber bearing and adjusting distribution of stiffness and damping in isolated story. The specific conclusion of the paper is that local deformation of isolated structure becomes minimality when translational stiffness ratio of superstructure is consistent with stiffness ratio of isolated story; and it also can reduce local deformation of minor structure by reducing damping ratio of isolated story properly.

本文研究表明,上部结构的刚度比及隔震层的刚度和阻尼比对结构的局部变形有着很大影响,通过橡胶垫的合理布置,调整隔震层的刚度和阻尼分布,能有效的减小结构的局部变形,提高结构的整体性,从而使隔震效果得以确保;本文的具体结论是,当上部结构的侧移刚度比与隔震垫刚度比一致或相近时,隔震结构的局部变形最小;适当减小子结构的隔震层阻尼比可减小该子结构的局部变形。

At this moment,that the change of neutral plane position plays a main role in the course of interface bonding,the grain refinement degree heightens whenεincreases. When e is higher than 4.8,the copper with big grains is made up of two kinds of structure regions in the course of deforming,namely fine sub-grains region and high density dislocation region.

此时,异步叠轧中性面位置的改变对界面的复合起到主要作用,变形等效应变的增大使晶粒细化程度变大;变形等效应变ε≥4.8时,粗晶铜在变形过程中有两种组织区域组成,分别为细小亚晶区和高密度位错区。

It has been found that there are some texture flaws such as large grain、badly distorted twin and streaky structure. But recrystallization grains ofaround 19μm in diameter on average are obtainable through heat treatment at300℃for 30min by air-cooling, meanwhile the twin and streaky structurethat would weaken the plasticity of alloy are eliminated; significant elementsare holding temperature、holding time、cool-down methods. Mechanicalproperties of tube are obtained, simple tension elongation ratio of arc testsample increases from 10.8% to 20.1%, elongation ratio with elastic internaldie of tube increases from 8.0% to 14.9%.

研究结果表明:挤压成型的AZ31镁合金管材组织中存在变形程度很大的孪晶、大尺寸晶粒、丧失了进一步变形能力的条带状组织等易导致后续塑性加工时变形不均,引起断裂的组织缺陷;采用最佳等温热处理工艺以20℃/min加热至300℃保温30min后空冷处理可以使试样平均晶粒直径从挤压态的50μm细化为19μm,同时基本消除上述组织缺陷;明显影响热处理效果的因素为保温温度、保温时间、冷却方式;室温下,采用最佳工艺热处理前后管材弧形试样的单向拉伸伸长率由10.8%提高至20.1%,管件的自由胀形极限伸长率由8.0%提高至14.9%。

The results show that the alloy undergoes obvious plastic elongation, the specimen fractures into four sections and the diameter changes from 16 mm to 12 mm. The fracture surfaces distribute randomly well developed and partially developed veinal patterns. The deformation behavior of alloy is non-Newtonian flow behavior. About 3% amorphous matrix of extruded specimen transforms crystal, the crystal particles with size of 10-20 mm are precipitated in the amorphous matrix, the thermostability of the extruded specimen was lowered. The failure of the alloy is mainly attributed to non-uniform viscous flow under high strain rate resulting from the hydrostatic extrusion process.

结果表明:非晶合金在高应变速率下产生了明显的塑性变形,直径从16 mm变为12 mm,断裂为4段,且样品断口上随机分布着充分发展与未充分发展的脉纹式切变带,由此可看出非晶合金的变形为非牛顿体变形行为;挤压后的样品约有3%的非晶相发生晶化,在非晶基体上析出10~20 nm的纳米晶粒,导致挤压后非晶合金的热稳定性降低;静液挤压高应变速率变形条件使非晶合金产生非均匀流变,是造成非晶合金断裂的主要原因。

The results show that the reduction of free height of steel 44Si2CrV spring under compressive stress 900 MPa consists of two parts: plastic deformation of surface decarburized zone to hinder elastically deformed internal material recovering, making up 84% of total reduction of free height and creep of steel at ambient temperature makin...

结果表明,44Si2CrV钢弹簧在900 MPa的应力下压缩72 h,自由高度的缩短由两部分组成:表面脱碳层的塑性变形,造成对内部材料的牵制而使部分弹性变形不能恢复,由此所造成的弹簧自由高度缩短占总变形量的84%;钢的室温蠕变,占自由高度缩短的16%。

The flow .structure and river bed deformation near piers when an angle exists between the trend of piers and the direction of main-flow will be different from those when the angle equal to zero, such as the flow-obstructing width will increase, the diversion function will occur, the partial scouring pits get larger and deeper, and the main-flow and thalweg within a certain distance downstream the piers will deviate to on...

对桥渡附近的河床变形进行了实验研究,认为在桥墩走向与主流方向存在一定偏角时,桥墩附近的水流结构和河床变形将会不同于没有偏角时的情况,如增大阻水宽度,起到导流作用,使局部冲刷坑增大变深,以及能使下游一定范围内主流位置和深槽位置向某一侧发生偏移。

Hurtle to press to belong to to material of cold process, the original material that use is all the plank material that has the good ductility generally, usually under the normal temperature, the material places among the molding tool, passing the output pressure function of punching machine or press machines under, make material press the shape occurrence su of the molding tool decision transform, get need of zero, parts, sometimes transform once and can't attain the request because of the material, also have the cent to hurtle to press for many times and transform gradually on the molding tool of dissimilarity, end attain to design the size request.

机械类的帮我翻译一下吧~谢谢了!冲压属对材料的冷加工,使用的原材料一般都是有良好的延展性的板材,通常在常温下,材料放置于模具间,通过冲床或压床产生的压力作用下,使材料按模具决定的形状发生塑性变形,得到所需的零、部件,有时因材料一次变形不能达到要求,也有分在不同的模具上多次冲压、逐步变形,最终达到设计尺寸要求。

The new ideas from this paper: using mechanics principle study of soil, create a practical test to prove that it could change the physical mechanics character of base soil completely, reducing distortion, improving strength, and eliminating wet or sinking of base soil by seal extrusion during hole formation process at certain replacement rate; it could strengthen the loessial soil base to high bearing capacity to standard value of 300 to 400kPa through seal extrusion to hole formation technology together with rammed cement soil pile. Some value of the parameters adopted by bearing capacity calculation of the composite base of rammed cement soil pile with seal extrusion to hole formation exceeded the criteria of 'Technical Regulation on Building Ground Treatment'.(JGJ79-2002) This technology meet the design requirements and save investment.

本课题的创新点:1 利用土力学原理进行研究及理论推导,并经实践:证明了在置换率为某一定值的情况下,在成孔过程中通过挤密作用可以从根本上改变地基土的物理力学性质,使地基土的变形减小,强度提高,湿陷性消除;2 挤密成孔工艺与夯实水泥土桩的组合,可使低强度的湿陷性黄土地基变成高强度的复合地基,其承载力特征值可达 300~400kPa;3 挤密成孔法夯实水泥土桩复合地基承载力计算所采用的有关参数取值范围超出了《建筑地基处理技术规范》JGJ79-2002 中的有关规定;4 在节省投资的前提下,解决了地基高承载力、低变形及黄土湿陷性问题,达到了设计要求。

Diamonds began growth when "Jiangnan continent" combined to Yangtze craton, the growth and residence average temperature T〓 was about 1200℃; Diamonds were mutil-stages growth and interruption caused by temperature and pressure varied during Yangtze craton activities; Diamonds were etched when the magma did not erupt on the surface and form failed magma in mantle; during the later growth term T〓<1050℃, the type ⅠaA diamonds formed unclear and growth; Before the host magma erupted T〓<0.5Ma, T〓A<850℃, the type Ⅰb diamond formed unclear and growth; Few diamonds were brittle deformation during growth term, some were plastic deformation after growth; when the host magma erupted on the surface and weathered to alluvial deposit, diamonds surfaces formed green spots caused by irradiation, then most of green spots became to brown spots during a mid-temperature metamorphism; modern river reform it to alluvial deposit in the minute valley again.

在扬子地台&江南古陆&克拉通化时,金刚石开始生长,其生长与保存的平均温度T〓在1200℃左右;期间由于地台的活动,生长的温度压力条件发生了多次变化,使金刚石出现多次生长、停顿;夭折的母岩上侵活动使金刚石受到熔蚀作用;在金刚石形成的晚期,T〓值下降到1050℃以下,出现了另一次金刚石的生长期,在临近金刚石母岩上侵时T〓<0.5Ma,温度进一步降到850℃以下,使Ⅰb型金刚石得以保存;在金刚石形成期间还有过碎性变形发生;金刚石形成后部分样品经过了塑性变形;金刚石在上侵过程中,遭受了强烈的熔蚀;在母岩露出地表,形成沉积砂矿时,受到了放射性物质的辐照,先形成表层的绿色斑点、壳层,后经过中低温的热变质作用,大部分绿色转化为褐色;现代河流作用对沉积砂矿进一步改造,形成现在的细谷型砂矿。

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