Gang Wang
,
Zbigniew H. Stachurski
金属学报(英文版)
doi:10.1007/s40195-016-0369-2
The homogeneous plastic flow in bulk metallic glasses (BMGs) must be elucidated by an appropriate atomistic mechanism. It is proposed that a so-called concordant shifting model, based on rearrangements of five-atom subclusters, can describe the plastic strain behaviour of BMGs in a temperature range from room temperature to the supercooled liquid region. To confirm the effectiveness of the atomic concordant shifting model, a comparative investigation between the vacancy/atom model and the concordant shifting model is carried out based on the estimation of the strain rate deduced from two models. Our findings suggest that the atomic concordant shifting model rather than the vacancy/atom exchange model can well predict the large strain rate in the superplasticity of BMGs.
关键词:
Bulk
,
metallic
,
glasses
,
Superplasticity
,
Vacancy/atom
,
exchange
,
model
,
Atomic
,
concordant
,
shifting
,
model
,
Strain
,
rate
尚飞
,
李洪波
,
张杰
,
胡超
,
张超
,
陈剑飞
钢铁
doi:10.13228/j.boyuan.issn0449-749x.20160118
为掌握1800 mm CSP轧机的板形调控特性，以某1800 mm CSP轧机为研究对象，建立了不同机架的有限元模型。利用有限元模型分析了不同带钢宽度下的弯辊力与窜辊对带钢板廓的影响，计算出上、中、下游机架的板形调控特性，得出当前中游机架板形调控能力最强，上游次之，下游最弱，并且板形控制能力随着带钢宽度的减小而减小。根据弯辊与窜辊在当前板形控制中所占比例，得出CVC窜辊是当前凸度控制的主要手段。对现场实际窜辊数据进行分析，得出上游机架凸度控制能力不足，中游机架凸度控制能力偏大，同时，通过对不同宽度带钢窜辊数据的分析得出轧制窄带钢时更易出现凸度控制能力不足的情况。现场数据与有限元仿真结果相互验证，研究结论可以为现场的辊形改进提供较好的理论分析基础。
关键词:
有限元仿真
,
板形调控特性
,
弯辊力
,
窜辊
,
轧辊凸度
