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氧对Fe(Cr,Mo)粉末冶金钢的显微组织与断口形态的影响
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作者 Lorenz S.Sigl Patrice Delarbre 韩凤麟 《粉末冶金技术》 CSCD 北大核心 2013年第5期385-391,共7页
有一些粉末冶金(Cr,Mo)合金钢是由大量生产的Astaloy CrM粉末(3%Cr,0.5%Mo)制造的,并且烧结件具有不同的含氧量。对这些材料的显微组织与断口形态进行了分析。发现,氧一般是以Cr_2O_3颗粒析出,聚集在沿以前颗粒边界的平面上。这种空间形... 有一些粉末冶金(Cr,Mo)合金钢是由大量生产的Astaloy CrM粉末(3%Cr,0.5%Mo)制造的,并且烧结件具有不同的含氧量。对这些材料的显微组织与断口形态进行了分析。发现,氧一般是以Cr_2O_3颗粒析出,聚集在沿以前颗粒边界的平面上。这种空间形相(spatial configuration)控制着烧结颈塑性变形时的晶核形成与微小孔隙的间距,因此,含氧量增高时,韧性与疲劳强度都会大大减低。最后表明,用高温烧结可制成兼具高强度与韧性好的粉末冶金(Cr,Mo)合金钢。这是因为高温烧结可将这些材料的含氧量(质量分数)减小到<0.05%。 展开更多
关键词 铬钢 韧性 断裂性状
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Microstructure-fracture toughness relationships and toughening mechanism of TC21 titanium alloy with lamellar microstructure 被引量:15
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作者 Zhi-feng SHI Hong-zhen GUO +1 位作者 Jian-wei ZHANG Jian-ning YIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第12期2440-2448,共9页
The independent influence of microstructural features on fracture toughness of TC21alloy with lamellar microstructure was investigated.Triple heat treatments were designed to obtain lamellar microstructures with diffe... The independent influence of microstructural features on fracture toughness of TC21alloy with lamellar microstructure was investigated.Triple heat treatments were designed to obtain lamellar microstructures with different parameters,which were characterized by OM and SEM.The size and content ofαplates were mainly determined by cooling rate from singleβphase field and solution temperature in two-phase field;while the precipitation behavior of secondaryαplatelets was dominantly controlled by aging temperature in two-phase field.The content and thickness ofαplates and the thickness of secondaryαplatelets were important microstructural features influencing the fracture toughness.Both increasing the content ofαplates and thickeningαplates(or secondaryαplatelets)could enhance the fracture toughness of TC21alloy.Based on energy consumption by the plastic zone of crack tip inαplates,a toughening mechanism for titanium alloys was proposed. 展开更多
关键词 titanium alloy lamellar microstructure fracture toughness crack tip plastic zone toughening mechanism
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Statistical damage model for quasi-brittle materials under uniaxial tension 被引量:4
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作者 陈健云 白卫峰 +1 位作者 范书立 林皋 《Journal of Central South University》 SCIE EI CAS 2009年第4期669-676,共8页
Based on the parallel bar system, combining with the synergetic method, the catastrophe theory and the acoustic emission test, a new motivated statistical damage model for quasi-brittle solid was developed. Taking con... Based on the parallel bar system, combining with the synergetic method, the catastrophe theory and the acoustic emission test, a new motivated statistical damage model for quasi-brittle solid was developed. Taking concrete for instances, the rationality and the flexibility of this model and its parameters-determining method were identified by the comparative analyses between theoretical and experimental curves. The results show that the model can simulate the whole damage and fracture process in the fracture process zone of material when the materials arc exposed to quasi-static uniaxial tensile traction. The influence of the mesoscopic damage mechanism on the macroscopic mechanical properties of quasi-brittle materials is summarized into two aspects, rupture damage and yield damage. The whole damage course is divided into the statistical even damage phase and the local breach phase, corresponding to the two stages described by the catastrophe theory. The two characteristic states, the peak nominal stress state and the critical state are distinguished, and the critical state plays a key role during the whole damage evolution course. 展开更多
关键词 quasi-brittle material damage mechanism MICROSTRUCTURE tensile properties fracture process zone
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