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作品数:4 被引量:24H指数:4
相关作者:宋辉王忠金赫晓东更多>>
相关机构:哈尔滨工业大学更多>>
发文基金:国家教育部博士点基金国家自然科学基金更多>>
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Effect of electropulsing on dislocation mobility of titanium sheet被引量:5
2012年
To investigate the effect of the electropulsing on dislocation mobility,specimens cut from the cold-rolled titanium sheet were treated by high density electropulsing with the maximum current density of 7.22,7.64,7.96 kA/mm 2 ,pulse period 110μs.The internal friction and elastic modulus were measured by a dynamic mechanical analyzer(DMA).When strain amplitude lowers a certain critical one,the damping of the electropulsed titanium sheet is lower than that of the cold-rolled one.When the strain amplitude exceeds the critical one,the damping of the electropulsed titanium sheet is extraordinarily higher than that of the cold-rolled or conventional annealed one.Furthermore,it is found that the damping peak of the electropulsed titanium sheet shifts to lower temperature compared with the conventional annealed one.It is demonstrated that the electropulsing treatment can decrease dislocation tangles and enhance dislocation mobility.
宋辉王忠金
关键词:DAMPINGELECTROPULSING
Improving in plasticity of orthorhombic Ti_2AlNb-based alloys sheet by high density electropulsing被引量:6
2013年
In order to optimize the ductility of orthorhombic Ti2AlNb-based alloys sheet,Ti22Al27Nb sheet was treated by high density electropulsing(J max =6.80 7.09 kA/mm2,tp =110 μs) under ambient condition.Microstructures were observed by SEM,and the tensile properties were also studied using uniaxial tension tests.The experimental results show that electropulsing can refine the microstructures of Ti22Al27Nb sheets.The specimen with the fine and homogeneous microstructures has good plasticity,and its elongation reaches 19.4%.The mechanism about the effect of electropulsing treatment on the microstructure of Ti22Al27Nb sheets was discussed.It was thought that the increase in nucleation rate during phase transformation and a very short treating time were regarded as the main reasons of producing smaller grains and increase in the plasticity by electropulsing.
宋辉王忠金赫晓东
关键词:PLASTICITY
Ti及TiAl合金的电致增塑性被引量:6
2013年
TiAl合金和Ti合金由于缺少滑移系,是典型的难变形材料.本文探索应用高密度脉冲电流改善其成形性.所选择的材料是TiAl合金(Ti2AlNb)、TC4合金(Ti-6Al-4V)、TA15合金和TA1-A.研究了脉冲电流处理对变形损伤的影响,研究结果表明,在一定条件下因塑性变形而产生的微裂纹可以被治愈,并形成局部的再结晶组织,预塑性变形试样的塑性可以被完全恢复,极限变形量得到提高.对退火态的板材进行了高密度电流脉冲处理试验分析,试验结果表明,电流脉冲处理显著地改变了板材的力学性能:均匀延伸率提高、屈服应力和屈强比下降.这对改善钛合金板材成形性具有重要的意义.选用冷轧态板材进行了脉冲电流处理实验,研究结果表明,脉冲电流处理可以大幅度地提高冷轧钛合金板材的塑性,同时材料强度不降低,由于晶粒的细化作用,强韧性得到改善.本文的研究结果表明高密度脉冲电流是改善难变形合金成形性的一种有效方法.
宋辉王忠金
关键词:脉冲电流处理晶粒细化
脉冲电流诱导钛合金板材裂纹愈合与组织演变研究进展被引量:8
2019年
钛及钛合金具有重量轻、强度高、耐高温、耐腐蚀等优良的特点,被广泛应用于航空、航天、汽车、舰船等的核心部件。因此研究如何改善钛合金的组织和力学性能、提高构件的工作可靠性,具有重要意义。脉冲电流具有多种效应,如可以促进位错运动、细化晶粒,并能自动识别金属内部微裂纹,从而实现损伤治愈。近年来,许多研究表明脉冲电流能够影响材料的微观组织,是改善材料力学性能的一种有效方法。针对脉冲电流对TA1-A纯钛、TC4钛合金、TA15钛合金、Ti2AlNb合金的组织和力学性能的影响、脉冲电流治愈钛合金板材微裂纹的数值仿真及脉冲电流参数对裂纹周围物理场分布规律的影响等进行了综述,以期为改善钛合金的成形性能和提高服役部件的使用寿命和可靠性方面的研究和应用提供参考。
王忠金宋辉蔡舒鹏段杰方骁任秀文
关键词:钛合金脉冲电流裂纹愈合
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