KC—202涂料用于高炉冷却壁钢管防渗碳的试验

采用ＫＣ—２０２涂料进行高炉冷却壁钢管（２０＃钢）防渗碳试验，结果表明，钢管表面至１ｍｍ深度范围内，碳含量均在０．３％以下；钢管的σｂ＞２００ＭＰａ、δ＞２０％。     

铸态铁素体球铁薄壁件的试生产

通过试验得出，高韧性铁素体球铁铸件的适宜碳、硅含量分别为３７％和３１％左右，用该材料生产的薄壁件其力学性能为σｂ≥５００ＭＰａ、δ≥１４％。     

淬火硬度对调质钢力学性能的影响

采用不同冷却方法对４０ＣｒＭｎＭｏ、４０ＣｒＮｉ２Ｍｏ和３７ＳｉＭｎ２ＭｏＶ三种钢进行淬火回火处理,考察了不同淬火硬度对回火后力学性能：σｓ、σｂ、δ５、ψ和Ａｋ的影响。结果表明３７ＳｉＭｎ２ＭｏＶ钢的各项指标随淬火硬度的变化最为明显,而４０ＣｒＮｉ２Ｍｏ钢的塑性和韧性好且受淬火硬度的影响较小。选材时应考虑淬火硬度不足可能导致塑性和韧性下降这一因素。     

异种钢焊接接头加热后碳迁移区力学性能的变化规律

对躯工体焊缝与珠光体耐热钢母材的异种钢焊接接头,采用热处理加速碳迁移法,分析了加热温度Ｔ和保温时间ｔ对接头增碳层厚度ｈ的影响规律和由此而引起的该区力学性能（即缺口拉伸强度σｂ、冲击韧性αＫＵ和冷弯角α）的变化。通过非线性回归分析,建立了ｈ、σｂ、αＫＵ和α对加热温度Ｔ和保温时间ｔ的数学模型。理论分析与试验结果拟合良好。随着加热温度的提高和加时间的延长,ｈ增大而σｂ、αＫＵ和α减小。据此规律可分析接     

厚度比对不锈钢复合铝板性能的影响

用四层对称轧制法制备了不同厚度比的不锈钢复合铝板，对不锈钢复合铝板的力学性能（σ０．２，σｂ和σ）、应变硬化指数（ｎ）、塑性应变比（Ｒ）、凸耳系数（△Ｒ）、杯突值（ＩＥ）与厚度比的关系进行了研究。结果表明，随厚度比的增加，σ０．２，σｂ以及ｎ值均增加，而δ值有所下降，但都不呈比例变化，即不符合混合规则。     

消失模铸钢件表面增碳的研究

研究了铸钢件表面增碳及不同模样材料对增碳的影响。结果表明，对于ＺＧ４５０，采用聚苯乙烯做模样，铸件表层增碳严重；采用聚甲基丙烯酸酯（ＰＭＭＡ）做模样，可以有效地减少铸件表面增碳。     

钢水原始含碳量对气化模铸钢件增碳影响的研究

试验研究了不同钢水中的原始含碳量、铸件壁厚等对气化模铸钢件表面增碳的影响。实验表明，铸钢件表面增碳具有严重的不均匀性；随钢水中原始含碳量升高，铸件表面增碳减轻；金属充填流程与铸件壁厚相比较，前者是铸件增碳更重要的影响因素     

焊接接头的力学性能试验内容

（1）焊接接头的拉伸试验（包括全焊缝拉伸试验）。试验的目的是测定焊接接头（焊接）的强度（抗拉强度σb，屈服点σs）和塑性（伸长率δ，断面收缩率ψ），并且可以发现断口上某些缺陷（如白点）。试验可按GB2651-89《焊接接头拉伸试验方法》进行。     

VALENCE ELECTRON STRUCTURE OF HIGH PROPERTY HIGH SPEED RESISTANCE STEEL AND ITS COMPOSITION DESIGN

１．ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｍａｉｎｐｒｏｐｅｒｔｙｒｅｑｕｉｒｅｍｅｎｔｔｏｈｉｇｈｓｐｅｅｄｉｍｐａｃｔｒｅｓｉｓｔａｎｃｅ（ＨＳＩＲ）ｓｔｅｅｌｉｓｂｏｔｈｈｉｇｈｓｔｒｅｎｇｔｈａｎｄｒｅｌａｔｉｖｅｈｉｇｈｔｏｕｇｈｎｅｓｓ．Ｔｈｅａｃｔｕａｌｒｅｑｕｉｒｅｍｅｎｔｓａｄｖａｎｃｅｄａｃｃｏｒｄｉｎｇｔｏａｐｐｌｉｃａｔｉｏｎｃｏｎｄｉｔｉｏｎｓａｒｅ：σｂ１６００ＭＰａ,σｓ１３００ＭＰａ,δ５８％,ＡＫＶ（ａｔ４０℃,ｃｒｏｓｓｄｉｒｅｃｔｉｏｎ）１４Ｊ．Ｉｎ…     

金属液的引入位置及涂料层性质对消失模铸钢件增碳的影响

试验研究了金属液的引入位置和涂料层性质对消失模铸钢件表面增碳的影响。试验结果表明，壁厚不均匀的条，板形铸件，金属液从薄壁处引入可减轻铸件增碳，讨论了粘结剂，涂层厚度及涂料附加物对铸件增碳的影响。     

石墨砂型铸渗过程数值模拟研究

针对石墨砂型铸渗过程,提出了在碳化物出条件下石墨砂型铸渗过程的温度场,浓度场,固相分数场统一数学模型,利用有限差分析法编制了数值模拟软件,对铸渗件二维不稳定温度场,浓度场固相分数场进行数值模拟;     

我国碳钢、低合金钢精铸业发展现状

采用水玻璃型壳精铸工艺，生产碳钢、低合金钢精铸件，虽然尺寸精度和表面粗糙度要求较低，但完全满足部分产品毛坯的要求，近5年来，产量年增长20％，已成为1个拥有1200家企业，年产量50万t，年产值50亿元的行业。     

移动磁场电磁力对铸件表面粗糙度的影响

采用移动磁场铸造薄壁铝合金流动试样，并对移动磁场铸造过程中铝合金熔体内的电磁力各分量的瞬时值及其对铸件表面质量的影响进行了理论分析。结果表明，随着磁感应强度的增加，铸件的表面粗糙度有增加的趋势，这在采用金属上型时表现更明显。由于通人电磁感应器的三相非平衡电流在铝合金熔体内所产生的电磁力是脉动的，其大小呈周期性变化，尤其是垂直于磁场运动方向上的电磁力，其脉动的幅度很大。由此认为，所产生的垂直于磁场运动方向上的脉动电磁力是引起熔体表面震荡起伏和导致铸件凝固后表面粗糙的主要原因。     

On the Plasma （ion） Carburized Layer of High Nitrogen Austenitic Stainless Steel

The manganese concentration of austenltic stainless steel decreases from the inner layer towards the surface of the plasma (ion) carburized layer due to the evaporation of manganese from the specimen surface. The carbon concentration in the carburized layer is influenced by alloyed elements such as Cr, Ni, Si, and Mo, as well as Nitrogen. This study examined the effects of nitrogen on the properties of the carburized layer of high nitrogen stainless steel. Plasma (ion) carburizing was carried out for 14.4 ks at 1303 K in an atmosphere of CH4 H2 gas mixtures under a pressure of 350 Pa. The plasma carburized layer of the high nitrogen stainless steel was thinner than that of an austentric stainless steel containing no nitrogen. This suggested that the nitrogen raised the activity of carbon in the plasma carburized layer, GDOES measurement indicated that the nitrogen level in the layer did not vary after plasma (ion) carburizing.     

New sol-gel refractory coatings on chemically-bonded sand cores for foundry applications to improve casting surface quality

Foundry refractory coatings protect bonded sand cores and moulds from producing defective castings during the casting process by providing a barrier between the core and the liquid metal. In this study, new sol-gel refractory coating on phenolic urethane cold box (PUCB) core was examined. The coating density, viscosity, moisture content and wet and dry weight of the coating were evaluated on cores that had been coated at three different dip-coating times. The coating coverage, surface appearance and depth of penetration into the cores were examined with a Stereomicroscope. Gray iron castings were produced with sol-gel coated and uncoated cores and the results were related to the coating properties. The casting results were also compared with castings made with cores coated with commercial alcohol-based and water-based foundry coatings. The analyses show that castings produced with sol-gel coated cores have better surface quality than those from uncoated cores and comparable surface quality with the commercial coatings. Therefore, the new sol-gel coating has a potential application in the foundry industry for improving the surface finish of castings thereby reducing the cost of fettling in the foundry industry since the raw materials and technology are easily affordable.     

The Influence of Carburizing Parameters on Carbon Transfer Coefficient

Definition of coefficient of carbon transfer in European Standard (EN 10052) is presented as: “Mass of carbon transferred from carburizing medium into the steel, per unit surface area per second for a unit difference between the carbon potential, and actual surface carbon content”.In this paper, a model is presented of carbon transfer from endothermic atmospheres to carbon steel. The carbon transfer coefficient values were determined experimentally by the foil technique and on specimens, taking into account the following parameters: chemical composition of atmospheres, carbon potential, temperature and time of the carburizing process. Some examples of the variation of the carbon transfer coefficient for two steps of the carburizing process,including soaking before quenching, are given, based on results obtained. The effect of carbon transfer coefficient on carbon content at the steel surface is given.     

大型异形铝铸件的铸造工艺研究

大型异形铝铸件,铸造工艺难度较大,常需依赖于丰富的生产经验辅之以计算机凝固模拟分析技术。针对不同的形状,制定相应的铸造工艺。对管体、轮毂、支腿垫块、螺旋桨等典型产品较为成熟的生产工艺进行介绍。通过对这些典型铸件的工艺案例进行分析,探讨大型异型铝铸件的铸造工艺设计方法。     

酚醛树脂砂壳型芯真空浇注铝合金件表面粗糙度的研究

开发了一种酚醛树脂砂壳型、芯真空浇注铝合金的工艺,对影响铝合金铸件表面粗糙度的因素,如原砂粒度、浇注温度、真空度、铸件壁厚和涂层厚度等进行了实验研究,认为施涂超细粉涂料是改善铝铸件表面粗糙度的有效措施。     

半环形薄壁不锈钢铸件的熔模铸造工艺

卡箍是一种半环形薄壁的304不锈钢铸件,该铸件具有充型难、易变形、易缩松的特点,且外表面不加工,表面质量要求严格,因此铸造生产比较困难.作者经过多次试验改进,采用一组两件的方式,成功地实现了该铸件的熔模铸造生产.     

钛合金冷坩埚电磁约束铸造工艺研究

针对液态下化学性质相对活泼的钛合金,采用冷坩埚技术对电磁约束铸造工艺过程进行了试验研究,考察了工艺条件对成形坯件表面质量和内部组织的影响.结果表明:试样抽拉速度变化对表面质量和宏观组织的影响明显,加热功率虽然对组织变化影响不大,但对表面质量影响较为显著.通过优化工艺,可以获得既有较光滑铸造表面又具有一次定向凝固组织的钛合金铸件.讨论了铸造过程裂纹和组织缺陷的形成机理,获得到了表面光滑无裂纹,宏观组织为柱状晶的钛合金大尺寸圆坯.