45钢淬火过程中传导方程逆问题求解

通过求解４５钢圆柱体淬火过程中含相变时的热传导逆问题，给出一种由实验测量的温度－时间关系和数值计算相结合确定表面换热系数的方法。该法适用于各种淬火液，能避免由于实验条件微波变化而引起的表面换热系数实测值的误差。     

Finite Element Simulation of Deep Drawing of Tailored Heat Treated Blanks

Using a laser system for local heat treatment, it is possible to adjust the mechanical properties of aluminum blanks in a restricted area by influencing the precipitation structure to manufacture so called Tailored Heat Treated Blanks (THTB). These blanks are characterized by a distribution of the mechanical properties adapted particularly for the forming conditions during deep drawing.This paper presents a finite element (FE) based procedure to determine adequate laser parameters for the heat treatment process to enhance the forming limits. Both FE and experimental results show the improved process compared to the conventional drawing of homogeneous aluminum blanks.     

大型铸钢件的热处理数值模拟与实验验证

对一重量为3323kg的大型车轮铸钢件的预备热处理过程进行了数值模拟分析。介绍了铸件的结构尺寸和铸件材料的热物性参数，以及数值模拟所需的初始条件和边界条件。模拟得到了热处理工艺的CCT曲线和铸件某些位置的冷却曲线，计算了铸件在整个热处理工艺中不同阶段的温度场、金相组织和力学性能的变化和分布状态。在铸件进行了实际热处理后测试了力学性能指标，实测结果与模拟结果基本吻合。实践证明，数值模拟技术是确定和优化热处理工艺参数的有效工具，能有效缩短工艺设计周期，降低生产成本，保证热处理质量，这对于单件小批量生产的大型热处理件具有更加实际的意义。     

Microstructure Evolution of Intermetallics Produced by Laser Powder Deposition

NiAl intermetallic alloys are potential high temperaturestructural materials in aeronautical and astronauticalindustries[1].However,the poor ductility andtoughness at room temperature severely restrict theirengineering applications[2,3].It is important todevelop new technology to product intermetallicmaterials for the improvement of the comprehensiveproperties and the workability.Laser powder depositionhas been used to synthesize many new materials.Furthermore,if incorporated with rapid proto…     

65Mn钢弹簧支撑的热处理工艺改进

改进对弹簧支撑热处理工艺，增加工艺孔，使用新的淬火挂具，采用表面喷砂处理，解决了工件热处理后硬度不均匀，外形变化及其表面不清洁的问题。     

等温淬火球铁(ADI)的热处理技术

详细叙述了等温淬火球铁的热处理工艺规范，指出热处理工艺参数应根据性能要求，视加热方式、工件厚度及装炉量等具体情况而定。     

空调铜翅片冲压模工艺分析与设计

从企业生产实际出发，在进行冲压成形理论探讨和各种冲压工序变形特性分析的基础上，采用子模分立结构的设计思想，设计了一副适用于铜翅片冲压的专用模具。     

医用钴基合金的组织结构及耐腐蚀性能

以锻造CoNiCrMo，CoCrMo和CoCrMoC台会为研究对象，通过金相观察，XRD分析和耐腐蚀试验，研究了3组合金在不同热处理条件下的显微结构，相成分及在Hi同溶液中的耐腐蚀性能。结果表明：2组锻造合金的再结晶温度都是1000℃，且晶粒尺寸随着固溶温度升高和时效时间延长而逐渐变大。3组试样在NaCl溶液中为钴基合金典型的阳极极化曲线；在Hanks’溶液中均有一个二次钝化行为，且锻造CoNiCrMo合金的二次钝化区域较窄，而其他2组合金则较宽；在含柠檬酸三钠的溶液中过钝化电位降低，柠檬酸盐的存在降低了含金的耐腐蚀性能。热处理对合金的耐腐蚀性能影响不大。     

Effect of Powder Type and Compaction Pressure on the Density,Hardness and Oxidation Resistance of Sintered and Steam-treated Steels

Two types of Hoganas iron powders—sponge (NC), and highly compressible (SC) were investigated. These specimens were compacted with a pressure of 300, 400, 500, 600, and 700 MPa, before sintering in a production belt-type furnace. Steam treatment of the specimens was at 570 °C for 30 min. The sintered density and as-sintered hardness increase with increasing compaction pressure, and are significantly influenced by the powder structural characteristics. During steam treatment the type of powder and compaction pressure have an important influence on the extent of pore closure and weight gain. The maximum hardness was obtained for the components compacted at a pressure of 500 MPa for both groups of iron powders. Surface pore closure and oxidation resistance of the steam-treated components are improved with increasing compaction pressure.     

两面顶金刚石单晶耐热性分析

本文通过热失重（TGA），示差扫描量热（DSC）法，扫描电镜（SEM），热侵蚀等方法分析了国产两面顶压机合成的金刚石单晶在空气中的耐热性。还分析了热侵蚀后金刚石的形貌变化并进行了抗压强度，T1、TT1的测量，将国产金刚石与进口金刚石作了大量的对比试验，发现两者的耐热性非常接近。发现金刚石的起始氧化温度在700℃左右，此时开始失重；剧烈氧化温度在850％左右，此时失重最为严重。在加热温度超过1200℃时在DSC图中出现了第二个放热峰，表明金刚石在受热温度超过1200℃时经历了第二次剧烈氧化阶段。这可能是由于在高温下触媒的反催化作用引起的。这为金刚石工具制造者及使用者提供了参考价值。