HEAT TRANSFER ANALYSIS DURING ROLLING OF THIN SLAB IN CSP

A mathematical model has been built to numerically predict the thermal history of thin slab during CSP （compact strip process） rolling. To estimate the temperature distribution in the slab mare accurately, the mathematical model combines heat transfer in the slab, in the roll, and at the roll-slab interface during bite. The numerical results agree with on-site running data, which proves the reliabili~, of the mathematical model. The results show that roll chilling has a significant effect on the temperature distribution in the slab.     

挤压铸件的热处理起泡缺陷研究

热处理起泡是挤压铸件常见的缺陷之一,它与挤压方式、工艺、模具等有关。对直接挤压铸件,只要不用油剂涂料,解决好排气,均能顺利进行固溶热处理,对于间接挤压铸件,还要设计好其内浇道系统,并严格控制好液态金属充型速度,防止夹杂等,也是可以进行固溶热处理的。     

压铸模使用寿命与优化压铸过程控制

分析了压铸过程中模具的热疲劳失效机理及其影响因素,讨论了优化压铸过程控制对模具寿命的影响.     

火力发电锅炉用高铬铁素体钢焊接材料

为了降低危害环境气体的排放量，一种观点认为这可以通过提高蒸汽状态来解决，并由此开发出了火力发电锅炉用高Cr铁素体耐热钢。为使这种高Cr铁素体耐热钢得到应用，选取合适的焊接材料是非常必要的。对火力发电锅炉用高Cr铁素体耐热钢焊接材料及其近来趋势做了概述。     

热处理对铸铁基多孔陶瓷复合材料组织与性能的影响

研究了热处理对铸铁基多孔陶瓷复合材料组织与性能的影响，结果表明，热处理正火，淬火均可不同程度地提高该复合材料的整体强度与耐磨性，而不影响铸铁－陶瓷的界面结构及材料的透气性。     

钻杆内螺纹接头失效分析

介绍了葡北4-11井场新钻杆发生内螺纹接头失效事故的有关情况,对失效钻杆进行了宏观分析与断口微观分析以及材质理化检验,从钻杆结构和载荷两个方面探讨了发生失效事故的主要原因,并提出了改进建议。     

提高精锻机锻造大规格高碳铬轴承钢的合格率

精锻机锻造高碳铬轴承钢时存在网状碳化物不易破碎、锻件合格率低的问题。通过采用锻后雾冷+正火雾冷+球化退火的热处理工艺,将轴承钢锻件网状碳化物的合格率从66%提高至93.4%。     

高温高压管道焊接坡口选择及焊条用量计算

从经济和技术角度分析火电厂高温高压管道焊缝宜采用的坡口形式,并对各种坡口形式的焊条用量估算推导出经验公式.     

热处理对AlN·Al_3Ti/ZL101原位复合材料力学性能的影响

研究了不同热处理制度对AlN.Al3Ti/ZL101原位复合材料力学性能的影响。结果表明,该复合材料中增强相尺寸为亚微米级,最佳的热处理制度为:530℃×5h固溶,60～80℃水中淬火,160℃×14h时效。在最佳热处理制度下,复合材料的抗拉强度、硬度、伸长率分别为345MPa、108HB和3.5%,均较铸态有较大幅度提高。     

Study on improvement of conductivity of Cu-Cr-Zr alloys

The influence of alloying, heat treatment, and plastic working on the performance of Cu-Cr-Zr alloys was investigated. The precipitated phases were characterized as Cr, Cu51Zr14 and Cu5Zr. Cu-Cr-Zr alloys demonstrate combination properties of high strength and high conductivity after solution treatment, aging treatment, and plastic deformation. Precipitation course of Cr is the main factor that influences the conductivity of Cu-Cr-Zr alloys, while adding Zr in the alloys adjusts the orientation relationship between Cr and matrix, and tends to increase the conductivity of aged Cu-Cr-Zr alloys after deformation.