国内会展

第二届中国(上海)国际氟硅材料及应用展览会//2005国际硅氟材料及其应用展览会//2005第四届青岛国际涂装及表面处理展览会暨、2005第四届青岛国际涂料、油墨及胶粘剂展览会//第6届中国（重庆)表面处理、涂装及防腐展览会//2005第二届国际防锈材料及技术设备展览会     

Influence of Tempering Temperature on Cyclic Viscoplastic Behaviour of 55NiCrMoV7 Steel

Low cycle fatigue behaviour of a steel 55NiCrMoV7 under tour tempered conditions is reported. One special type of total swain controlled isothermal cyclic deformation tests were performed in the temperature range 20℃ to 600℃ for the steel tempered 2h at 350℃, 460℃, 560℃ and 600℃. The influence of temperature on cyclic behaviour was investigated. Generally, the cyclic stress response shows an initial exponential softening for the first few cycles, followed by a gradual softening without cyclic softening saturatioo. At 10^-2 strain rate, σmax.Δσ／2 decrease with the test tumperature for all hardness levels. They decrease linearly with tempering temperature when testing temperature is lower than that of tempering, but rest nearly constant when test temperature is equal to or exceed tempering temperature of steel. Cyclic softening intensity increases with testing temperature from 300℃ to 600℃, but the maximal softening intensity occurs at room tumpemture. The strain rate influences notably the cyclic behavioor when T≥50℃, The time dependence of cyclic behaviour is closely related to test temperature and the tempering history of the steel.     

The Microstructure and Mechanical Properties of the Low Carbon Microalloy Steel by High Voltage Electropulse Heating

The low carbon microalloy steel samples were heated to different temperatures by high voltage electropulse discharge heating method. The temperature of sample increases with the discharge current density. Microstructures were observed by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Results show that coexist microstructure of ultrafine ferrite grain and martensite can be obtained by proper high voltage electropulse discharge heating process parameter. The tensile testing indicate that better mechanical properties were obtained, including 758MPa yield strength, 796MPa ultimate strength and 12% total elongation.     

FORMATION OF GRADIENT COATING OF Fe-BASED ALLOY WITH RARE EARTHS BY PLASMA SURFACING

A gradient coating of Fe-based alloy was manufactured with rare earths (RE) by plasma surfacing on Q235 steel substrate. The coatings were studied by using X-ray diffraction (XRD), scanning electron microscope (SEM), differential thermal analyzer (DTA), and electron probe micro-analyzer (EPMA). The results show that the phases of the two kinds of coatings(with and without RE) both include α-Fe, Fe7C3， Fe3C, Cr2B, Fe2B and FeB. The microstructure of F314 coating is mainly hypereutectic, the pro-phases Cr7C3 and Cr2B are loose, crassi, spiculate and contain microcracks. The brittleness of the coating is high, and the average hardness is 787 HV. When 0.8wt% RE was added into the F314 alloy, the microstructure varied from hypoeutectic to hypereutectic continuously, The hardness appears as gradient distribution with the highest value of 773 HV, meanwhile, the brittleness decreases significantly. The formation of gradient structure depends on the fallowing factors: (i) the conversion of RE. The addition of RE lowers the elements point and Fe-C eutectic temperature, thus the base metal melting acutely. (ii) the heating of plasma arc.Graded temperature results in directional solidification, thus the gradient structure forms easily. The main reasons for the hardness decrease with RE addition in the alloy are the ratio of hard phase lowering and the hardness of the hard phase decreasing.     

菲律宾电池回收的环境无害化处理

铅酸蓄电池的回收处理是一个世界各国政府与公众普遍关心的一个重大问题。小而分散的众多小再生铅企业的存在和行业的无序管理不仅给公众带来身体的危害和环境的污染，而且对经济与社会的可持续发展产生重大的负面影响。在发达国家中，各国政府对再生铅的管理十分严格，形成了比较完备的法律法规体系，在这些国家中，再生铅企业的数量很少，但规模都很大，并形成了协调有序的收集、贮存、流通、生产、加工利用网络。而在一些发展中国家，报废铅酸蓄电池回收利用的行业管理才刚刚起步。本期刊发国际铅管理中心的B威尔逊先生给菲律宾政府所作的研究项目。文章从铅回收市场、技术、管理与方面论述了菲律宾的废铅蓄电池回收利用行业的基本状况。值得注意的是，菲律宾作为《巴塞尔公约》的缔约国之一，每年也在进口废铅酸蓄电池，用以弥补国内资源的不足，这就是他们要采用巴塞尔禁案修正案的目的。该篇报告的原标题：“在遵守巴塞尔公约贸易限制情况下，菲律宾铅蓄电池回收的环境无害化的经济可行的管理要求和利益”。本刊现摘要刊发，并由此引起大家的讨论。事实上，根据各国的实际情况来决定铅蓄电池这类再生资源是否可以进口，根据自身的各种条件和因素选择一套无害化处理系统，这是一条比较现实的道路。     

再生短波

由国家发展与改革委员会、科技部、水利部、国家环保总局共同支持,中国资源综合利用协会和慕尼黑国际博览集团联合主办的首届“中国国际环保、能源和资源综合利用博览会”(IFAT China2004)将于2004年6月29日在上海新国际博览中心拉开序幕。两年一届的“IFAT China2004”被赋予了广泛的展示范围:水和废水处理,废弃物处理和回收,烟气净化,降噪减振,节能和可再生能源,资源综合利用等。众多国外企业的参与将是“IFAT China2004”成为中国及邻近国家环保领域的企业、政府组织开展国际交流、经贸往来的最重要窗口。德国慕尼黑博览集团是世界…     

废塑料的识别和对环境无害化处理及其处置的技术指导草案

考虑到巴塞尔公约前言提及的保护人类健康和环境并且有效利用自然资源的需要，这些技术导则就是提供关于废塑料的鉴别、对环境无害处理、回收和最终处置的一般性指导。     

Unique microstructure and property of a 2024 aluminum alloy subjected to upsetting extrusion multiple processing

The microstructure and hardness of a 2024 aluminum alloy subjected to multi-pass upsetting extrusion at ambient temperature were studied. Experimental results indicated that with the number of upsetting extrusion passes increasing, the grains of the alloy are gradually refined and the hardness increases correspondingly. After ten passes of upsetting extrusion processing, the grain size decreases to less than 200 nm in diameter and the sample maintains its original shape, while the hardness is double owing to equal-axial ultrafine grains and work hardening effect caused by large plastic deformation.     

日本表面技术综合展（METECO4）概况

2004年5月27～29日，由日本表面技术协会、日本镀金材料协会、日本涂装技术协会、日本热处理技术协会和日本表面处理机械工业会联合举办的表面技术综合展-METECO在日本东京举行。支持单位有：日本应用物理学会，轻金属协会，日本机械学会，日本材料学会，日本金属学会，日本化学     

中国热协成功举办了热处理质量检验员培训班

2003年12月14～19日，中国热处理行业协会应热处理行业企业的迫切要求，在山东省济南市举办了首批热处理质量检验员培训班。旨在提高热处理企业的生产水平，保证产品质量，增强市场竞争力，推动行业进步。培训对象是热处理企业的质量检验员和质量管理人员。