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不同Nb-V含量对Cr8型冷作模具钢微观组织和力学性能的影响迟宏宵1,2,马党参2,刘建华2,陈再枝2,雍岐龙-2(1.云南省昆明市昆明理工大学材料科学与工程学院2.北京市钢铁研究总院结构材料研究所)摘 要:基于以Nb替代V的设想,采用OM,SEM,EDS,相分析,硬度测定及冲击韧性实验,研究了不同Nb-V含量对Cr8型冷作模具钢微观组织和力学性能的影响.结果表明,Nb提高MC共晶碳化物的析出温度,包晶反应和包共晶反应的温度也随之提高,初生γ相中C含量的分布更不均衡.当Nb含量(质量分数)达到1.32%时,初生......
Cr12MoV冷作模具钢在深冷处理过程中的相变研究李向军1,李绍宏1,闵永安1,吴晓春1(1.上海市上海大学材料科学与工程学院)摘 要:采用DSC热分析及电阻测定等物理测试手段,对Cr12MoV钢在深冷处理过程中的相变进行了研究.结果表明,经冷处理后的试样在加热过程中有更多的碳化物析出,经过-196℃深冷处理的比-79℃冷处理的析出量更多.深冷处理促使残余奥氏体进一步向马氏体转变以及碳化物析出,是提高冷作模具钢尺寸稳定性和耐磨性能的一种有效措施. 关键词:Cr12MoV......
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; 文章编号:1672-7207(2015)01-0066-07 Progressive die forming optimization based on numerical simulation and response surface method LI Junchao1, WANG Bin1, ZHOU Tonggui1, DAI...: Ruptures, winkles and low forming accuracy are the forming defects for progressive die forming parts. Based on valve bracket, a finite element model (FEM) of complete progressive die forming......
H13热作模具钢纯净度研究熊海波1,李晶1,谭兵2,陈雪梅2,张波2(1.北京市北京科技大学 冶金与生态工程学院2.广州市冶金工业研究所)摘 要:采用中频炉-模铸-电渣重熔-退火工艺路线,生产H13热作模具钢.研究了冶炼过程中T.[O]总含量[H],[S]含量及大型夹杂物的变化规律.结果表明,采用该工艺生产的H13 T.[O]含量为42×10-6~56×10-6,[H]含量为1.6×10-6~3.0×10-6,[S]含量为0.004%~0.005 5%,大型夹杂物含量为1.1~2.24 mg/10 kg.具体研......
Cr8Mo2SiV钢二次硬化机理的研究迟宏宵1,2,马党参2,王昌2,陈再枝2,雍岐龙-2(1.云南省昆明市昆明理工大学材料科学与工程学院2.北京市钢铁研究总院结构材料研究所)摘 要:采用硬度计SEM,EDS,TEM和XRD研究了经深冷处理和未经深冷处理Cr8Mo2SiV钢的回火硬度,残余奥氏体含量和碳化物析出行为.结果表明,Cr8Mo2SiV钢经1030℃淬火后,二次硬化峰值硬度出现在回火温度为520℃.深冷处理能够显著减少残余奥氏体含量,进而提高二次硬化峰温度之前的回火硬度,并使二次硬化峰向低温区移动20℃......
Trans. Nonferrous Met. Soc. China 27(2017) 282-288 Effect of external forces on microstructural evolution and mechanical properties of high pressure die cast AA5754 alloy R. HAGHAYEGHI Department...) and electromagnetic stirring (EMS) forces, individually and in combination, prior to high pressure die-casting of AA5754 alloy were assessed. The liquid of alloy was subjected to UT, EMS and the combined style......
extrusion process of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (mole fraction, %) alloy was investigated by a Deform-3D software. The influences of extrusion speed, die half-angle, extrusion ratio and die fillet... and deformation uniformity has almost no change. The expanded die half-angle is detrimental to the damage factor and deformation uniformity, while the enhanced extrusion ratio promotes the improvement......
Trans. Nonferrous Met. Soc. China 23(2013) 66-72 Influence of Ce addition on microstructure and mechanical properties of high pressure die cast AM50 magnesium alloy Faruk MERT1,2, Ahmet 2, Karl... and even AM50 alloy without any Ce. Key words: AM50 magnesium alloy; cerium; die casting; microstructure; mechanical properties 1 Introduction Weight reduction is very attractive for current applications......
