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, and its elongation increases from 5.5% to 13.8%.The increase of the strength is related to the rising of the kinds of the phase which is coherent or semi-coherent to the matrix, the size of the particles, distribution heterogeneous and the percentage of the second phase volume. The increase of the elongation is related to the improvement of the alloy plasticity by precipitate free zone caused......
by (-196 ℃, 12 h)+(200 ℃, 12 h) for 4 times. There was some decrease in ultimate strength but some increment in elongation when treated by (-196 ℃, 12 h)+(250 ℃, 12 h). However, the ultimate strength abruptly decreases to 307 MPa and the elongation increases to 5.6% when the samples are treated by (-196 ℃, 12 h)+(300 ℃, 12 h), and the mechanical properties are stable at this level as the number......
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不锈钢带拉矫过程变形行为的数值模拟研究孙朝阳1,张栋1,张清东1,李实2,蔡永跃2(1.北京市北京科技大学机械工程学院2.宁波宝新不锈钢有限公司,浙江宁波 315807)摘 要:建立了不锈钢拉伸弯曲矫直过程的有限元仿真模型,该模型针对不锈钢拉矫机辊组配置和旋转压下的特点,采用了窄条三维壳单元对带钢进行特征建模.为提高计算效率,带钢网格进行了局部细化.对304不锈钢典型规格带钢拉矫过程进行模拟,伸长率计算值与实测值吻合较好.对带钢拉矫过程特征位置点经过各辊组的应力应变分析表明:带钢伸长率主要由1号弯曲辊组提供,而......
. The results of tensile tests showed that the Mg-4Li-3(Al-Si) alloy exhibited the highest ultimate tensile strength (UTS) of 249 MPa but the lowest elongation of 6.3%. The Mg-12Li-3(Al-Si) alloy had the highest elongation of 26% but the lowest UTS of 173 MPa. The different mechanical properties were attributed to the different crystal structures of the three alloys and the precipitate with different......
bending test without brittle fracture at room-temperature, the elongation ratio of spheroidized as-cast specimen is 15.7% while the tensile strength σb is 259.5MPa. The ingot is hot-forged at 850℃ to sheet... gradually during the bruising process.
Key words: Ni-graphite alloy; plastic deformation; fiber-like microstructure; elongation ratio
......A NEW HEAT-TREATMENT PROCESS FOR 2014 ALUMINUM ALLOY AND ITS MECHANISM
来源： 《中国有色金属学报(英文版)1993年第3期》——Wang Lingyun Huang Guangjie Chao Denju
宝钢某连续退火机组平整机控制技术李东江1,2,陈启军1,王国民1(1.上海市同济大学电子与信息工程学院2.上海市宝山钢铁股份有限公司)摘 要:宝山钢铁股份有限公司某连续退火机组采用双机架平整工艺,以延伸率控制为核心,通过调节张力或轧制力来实现延伸率的稳定.延伸率采用闭环控制,为提高实际延伸率的计算精度,在高速和低速两种不同的情况下,采用不同的方法进行计算.张力调节器的输出乘以一个比例系数,作为上游设备速度给定的张力前馈补偿,以减小动态过程中带钢张力的波动.轧制力控制采用轧制力外环,位置内环的双闭环结构,提高了系......
Sn对Mg-6Al合金力学性能的影响李萍1(1.河南省洛阳市洛阳理工学院 土木工程系)摘 要:采用拉伸试验,断口分析和组织观察,研究150℃和175℃下不同Sn含量Mg-6Al合金的抗拉强度和延伸率,得出Mg-6Al合金的力学性能随Sn含量的变化关系.结果表明,随着Sn含量的增加,Mg-6Al合金的抗拉强度和延伸率均先增加后降低,且均在Sn含量为1%时取得最大值.加入适量的Sn可改善Mg-6Al合金的显微组织,从而提高其力学性能.关键词:金属材料； Mg-6Al合金； Sn； 抗拉强度； 延伸率......
