奥氏体钢马氏体相变点M_s、M_（εs）

在计算机上回归处理了大量试验结果，得到了奥氏体钢的Ｍ＿ｓ、Ｍ＿εｓ定量经验计算式：Ｍ＿ｓ（Ｋ）＝７３１－２２７（Ｃ＋Ｎ）－１７．６Ｎｉ－２２．５Ｍｎ－１７．３Ｃｒ－１６．２ＭｏＭ＿εｓ（Ｋ）＝６３０－２６１．４（Ｃ＋Ｎ）－１３．７Ｍｎ－１３．１Ｃｒ－１７．９Ｎｉ－３８．５Ａｌ在热力学上从层错能及Ｍ＿ｓ、Ｍ＿εｓ的相对变化角度较好地解释了奥氏体钢的γ→α，γ→ε→α，γ→ε相变，并且进一步用试验数据验证，结果也较满意。     

Mossbauer Effect of Rapidly Quenched Al-Fe-V-Si-Mm Alloys

ＭｏｓｓｂａｕｅｒＥｆｆｅｃｔｏｆＲａｐｉｄｌｙＱｕｅｎｃｈｅｄＡｌ－Ｆｅ－Ｖ－Ｓｉ－ＭｍＡｌｌｏｙｓＷａｎｇＪｉａｎｑｉａｎｇ（王建强），ＣｈａｏＹｕｅｓｈｅｎｇ（晁月盛），ＺｅｎｇＭｅｉｇｕａｎｇ（曾梅光），ＺｈａｎｇＢａｏｊｉｎ（张宝金），Ｃｈ...     

Mossbauer Measurements of Amorphous Nd-Fe Films

ＭｏｓｓｂａｕｅｒＭｅａｓｕｒｅｍｅｎｔｓｏｆＡｍｏｒｐｈｏｕｓＮｄ－ＦｅＦｉｌｍｓＬｕＭａｎ－Ｑｉ（吕曼祺）（ＳｔａｔｅＫｅｙＬａｂｏｆＲＳＡ，ＩｎｔｅｒｎａｔｉｏｎａｌＣｅｎｔｒｅｆｏｒＭａｔｅｒｉａｌｓＰｈｙｓｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃ...     

Electrode Characteristics of MmNi_5－type Alloys for Nickel－metal HydrideBatteries

ＥｌｅｃｔｒｏｄｅＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＭｍＮｉ_５－ｔｙｐｅＡｌｌｏｙｓｆｏｒＮｉｃｋｅｌ－ｍｅｔａｌＨｙｄｒｉｄｅＢａｔｔｅｒｉｅｓＧｅｎｇＭｉｎｇ－Ｍｉｎｇ（耿鸣明）（ＤｅｐａｒｔｍｅｎｔｏｆＰｒｅｃｉｓｉｏｎＡｌｌｏｙ，Ｃｅｎｔｒ?..     

HREM Study on Sm(Co,Fe,Cu,Ti)_7 Alloy Aged under Different Conditions

ＨＲＥＭＳｔｕｄｙｏｎＳｍ（Ｃｏ，Ｆｅ，Ｃｕ，Ｔｉ）_７ＡｌｌｏｙＡｇｅｄｕｎｄｅｒＤｉｆｆｅｒｅｎｔＣｏｎｄｉｔｉｏｎｓＬｉｕＡｎｓｈｅｎｇ（刘安生）（ＧｅｎｅｒａｌＲｅｓｅａｒｃｈｉｎｓｔｉｔｕｔｅｆｏｒＮｏｎ－ｆｅｒｒｏｕｓＭｅｔａｌｓ，Ｂｅｉ?..     

Study on the influence of La_2O_3 on Stress in α－Al_2O_3 Scale by a Novel Two－side Oxidation Bending Method

ＭａＸｉｎ－Ｑｉｎｇ；（马信清）；ＬｉＭｅｉ－Ｓｈｕａｎ；（李美栓）；ＬｉＴｉｅ－Ｆａｎ；（李铁藩）（ＩｎｓｔｉｔｕｌｅｏｆＣｏｒｒｏｓｉｏｎａｎｄＰｒｏｔｅｃｔｉｏｎｏｆＭｅｔａｌｓ，ＣｏｒｒｏｓｉｏｎＳｃｉｅｎｃｅＬａｂｏｒａｔｏｒｙ，Ａｃａｄｅ...     

热变形对86CrMoV7钢过冷奥氏体连续冷却转变的影响

用Ｆｏｒｍａｓｔｅｒ－Ｆ全自动膨胀信和ＴＨＥＲＭＥＣＭＡＳＴＯＲ－Ｚ热模拟试验装置测定了８６ＣｒＭｏＶ７钢未变形和奥氏体、一次变形奥氏全和二次变形奥氏体的ＣＣ一。结果表明，试验用钢只发生珠光体转变和马氏传转变；热变形明显地促进珠江体、马氏体转变；不发生珠光体转变的临界冷却速度由０．７６Ｃ／ｓ（未变形）提高到３．１Ｃ／ｓ（一次变形）和１．５Ｃ／ｓ（二次变形）；Ｍｓ点由１４３Ｃ（未变形）提高到１５０℃     

Effect of Mischmetal on Oxidation Resistance of 55Al－Zn Alloy Hot Dip Coating

ＥｆｆｅｃｔｏｆＭｉｓｃｈｍｅｔａｌｏｎＯｘｉｄａｔｉｏｎＲｅｓｉｓｔａｎｃｅｏｆ５５Ａｌ－ＺｎＡｌｌｏｙＨｏｔＤｉｐＣｏａｔｉｎｇＺｅｎｇｐｅｎｇ；（曾鹏）（ＧｕａｎｇｄｏｎｇＭｅｃｈａｎｉｃａｌＣｏｌｌｅｇｅ，Ｇｕａｎｇｚｈｏｕ５１０６４３，Ｃｈ...     

Synthesis and Crystal Structure of Ytterbium Trichloride Complex with Proline

ＳｙｎｔｈｅｓｉｓａｎｄＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆＹｔｔｅｒｂｉｕｍＴｒｉｃｈｌｏｒｉｄｅＣｏｍｐｌｅｘｗｉｔｈＰｒｏｌｉｎｅＭａＡｉ－Ｚｅｎｇ（马爱增）；ＬｉＬａｉ－Ｍｉｎｇ（李来明）；ＪｉｎＳｏｎｇ－Ｃｈｕｎ（金松春）；ＬｉｎＹｏｎｇ－...     

钢包炉（LF）CaO－SiO_2－MgO－Al_2O_3渣系的脱硫试验

钢包炉（ＬＦ）ＣａＯ－ＳｉＯ_２－ＭｇＯ－Ａｌ_２Ｏ_３渣系的脱硫试验郭上型，万真雅（华东冶金学院，马鞍山２４３００２）ＤｅｓｕｌｐｈｕｒｉｚｉｎｇＴｅｓｔｕｓｉｎｇＣａＯ－ＳｉＯ_２－ＭｇＯ－Ａｌ_２Ｏ_３ＳｌａｇｉｎＡＬａｄｌｅＦｕｒｎａｃｅ￥ＧｕｏＳ...     

圆管拉拔工艺流程设计计算方法

本文推荐的设计计算圆管拉拔工艺流程的ＫＤ－ＫＳ方法，能方便地对道次减径量和减壁量进行搭配，以利控制成品管的性能。ＫＤ－ＫＳ方法适用性广，特别适用于由成品管尺寸选择中间管坯尺寸。     

基于数值模拟的连续挤压铝管竹节纹缺陷的成因探讨

本文针对连续挤压本身金属流动不均匀是否会导致挤压铝圆管时出现竹节纹缺陷这一问题进行了数值模拟分析,并对几种均衡金属流速的方案进行了对比研究.通过去掉凹模以解决模拟过程中网格自接触的问题,使模拟过程得以实现.通过对金属在各分流孔流动均匀性判定参数δ的比较得出结论:连续挤压本身的结构特点所造成的变形金属在腔体进料口处所产生的速度差异,不会导致竹节纹缺陷出现;使用具有3个分流孔的分流组合模时,采用通用的铝材连续挤压腔体,并将凸模的一个分流桥放置在靠近堵头的对称面上,是均衡金属流速的最佳方案.     

Enrichment of Methane Concentration via Separation of Gases using Vortex Tubes

The objective of this work was to determine if a vortex tube can be used as a gas separation device. A vortex tube is a simple mechanical device that has no moving parts. It separates a compressed inlet fluid into two streams, one hot and the other cold. There are a variety of theories to explain this separation. It has been hypothesized that a mixture of compressed gases flown into the vortex tube may separate into individual gas streams by virtue of differential centrifugal forces acting on them. During previous studies by others, conflicting results have been obtained using this hypothesis. Further study of the gas separation process in a vortex tube was carried out. An attempt has been made to separate methane and nitrogen gases using vortex tubes. This particular separation or the resulting enrichment of Methane concentration has applications in the mining industry. Methane is emitted in an underground coal mine. It leaks from the coal seams and is extremely hazardous for workers because of its high explosivity in air. A conventional but costly means of circumventing this problem is methane drainage before mining. Yet another effective method is to blow large amount of air through the mine to locally dilute methane concentration. The mixture of methane and air is directly passed into the atmosphere. There are advantages to separating methane from air at the ventilation exhaust of the mine. First, methane being a greenhouse gas has strict EPA emission standards, and second, methane can be directly used for generating power. In this experimental work, a laboratory size setup was used to investigate the feasibility of using a fixed geometry vortex tube for separating methane and nitrogen from a mixture. It was found that there was partial gas separation leading to a higher concentration of methane at one exit in comparison to the inlet and a lower concentration at the other exit.     

Mechanical Joining of Tubes to Sheets Along Inclined Planes

This paper presents a new mechanical joining process for fixing tubes to sheets along planes inclined with respect to the tube axis. The process is based on the capacity of producing and controlling inclined instability waves in thin‐walled tubes subjected to axial compressive load and is capable of ensuring significant economic and time savings when compared to currently available joining technologies. The presentation includes details on tool design, independent determination of the mechanical properties of the materials, numerical modeling, and experimentation under laboratory conditions with the aim of determining the process window as a function of the major operative parameters. The feasibility of joining tubes to sheets along inclined planes is demonstrated by presenting one connection performed at the tube end and another connection performed away from the tube end.     

Process Strategies and Analysis of Rolled‐in Tubes

A new method to manufacture composite workpieces is joining of two parts by rolling‐in, a technique which has been developed at the Department of Machining Technology (ISF) and at the Institute of Forming Technology and Lightweight Construction (IUL). In this article, the technology is described and different strategies to shorten the joining process without a decrease of the strength of the composite are presented and compared. To improve the knowledge about the material flow, the strain distribution in the contact zone has been analysed both experimentally and by means of finite element analyses (FEA). In order to evaluate the strength of the composite, an analysis of the press‐out forces and of the residual stresses in the inner tube has been carried out, also by means of experiments and simulations.     

冷轧道次变形率对TA18钛合金管材组织与拉伸性能的影响

改变冷轧道次变形率研究其对TA18钛合金管材组织和拉伸性能的影响。用金相显微镜观察了其微观组织形貌,用Instron 1185拉伸试验机测试了拉伸性能。结果表明:冷轧态TA18钛合金管材显微组织为纤维状;冷轧第三、四道次管材的晶粒取向程度弱于第一、二道次,抗拉强度和屈服强度较低,但延伸率大幅提高;经过750℃/90 min再结晶退火后所有TA18管材晶粒为等轴状晶粒,组织取向消失,同时由于细晶强化作用,使第一、二道次退火后的TA18钛合金管材保持了相对较高的强度和延伸率。由于第三、四道次冷加工态性拉伸能指标与第一、二道次退火态较为接近,因此存在通过连轧的方式来简化工艺流程的可能。     

预埋PVC管炮孔影响爆破效果浅析

在拆除爆破施工工程中,利用预埋PVC管作为爆破拆除的炮孔,可以有效的节约钻孔时间及成本,但其爆破效果并不能满足预期效果。针对该问题,根据炸药在PVC管中应力波的传播规律,对PVC管弱化爆破效果进行理论分析,掌握管壁材料波阻抗对孔壁初始压力的影响。利用数值模拟软件ANSYS/LS-DYNA及现场试验,将钻孔和PVC管爆破过程进行对比研究,得出使用PVC管时需要额外消耗约10%的炸药,因此根据不断的现场试验,确定使用PVC管时需要增加单孔药量为50g左右。     

Splicing of Precast Concrete-Filled FRP Tubes

This paper reports on a feasibility study of splicing techniques for precast concrete-filled fiber-reinforced polymer (FRP) tubes (CFFT). A total of four spliced beams were tested. Three were internally spliced using grouted steel bars, grouted FRP bars, or unbonded posttensioning bars, and the fourth was spliced with FRP socket, commonly used in the piping industry. A control CFFT beam with no internal reinforcement was also tested as a reference. The experiments showed the superior effect of FRP tube continuity on system performance. Although initially stiffer, none of the spliced beams tested in this program was as strong as the control specimen. This may be primarily attributed to the lack of continuity of the FRP tube, as well as the quality of the cement grout for dowel reinforcement. Posttensioning proved to be efficient in improving system performance. The system may benefit from FRP continuity through either a longer and more effective socket or a threaded coupler insert or sleeve. Internal reinforcement can further increase the stiffness and strength of the connection, if grouting quality is controlled. Splicing may be improved by combining the methods tested in this program. Further understanding of the implications of composite action between FRP and concrete was achieved. Finally, the behavior of spliced CFFT beams was closely described using a combination of beam theory and rigid body deformations; the extent of the latter depends on joint stiffness.     

CT20钛合金薄壁管材数控冷弯成形行为研究

薄壁管材的小弯曲半径数控弯曲成形十分困难,外侧壁厚减薄是弯管成形中的加工缺陷之一,对于钛合金薄壁管尤为严重。采用模拟与实验相结合的方法,对规格为58 mm×1.5 mm的CT20钛合金管材数控弯曲成形过程中弯曲段的壁厚减薄进行了研究,得到相对弯曲半径对壁厚减薄的影响规律。结果表明,CT20钛合金管材冷弯成形时的极限相对弯曲半径(R/D)为2。     

Roll Forming Strategies for Welded Tubes

Tubes are used as semi‐finished products as well as final components in almost all areas of the engineering industry. Roll forming of tubes with longitudinally oriented welding lines is one of the most efficient and economic tube production processes. However, numerous roll forming strategies already exist. Each strategy involves a characteristic change of the material properties from the initial slit strip to the final tube. A classification of the different roll forming strategies, which is given in this paper, aims to provide a systematic overview. A finite element analysis of the roll forming process is presented to identify specific forming loads and property changes.