周继宝
,
王恩刚
,
左小伟
,
屈磊
,
张林
,
赫冀成
材料热处理学报
研究了Cu-12.8%Fe复合材料形变热处理时退火温度和形变量对复合材料微观组织、导电率及抗拉强度的影响。结果表明,退火温度的升高,Fe纤维逐渐出现弯曲、断开等再结晶现象,退火处理后进一步拉拔可以增加纤维的连续性,恢复纤维的拉拔特征,且Fe纤维较退火处理后纤维细小;随形变量的增加,复合材料的抗拉强度逐渐增加,导电率逐渐降低,450℃×1 h退火处理后复合材料的加工硬化率增加最为显著,且450℃退火处理后形变至减面率为81.6%时,抗拉强度与导电率分别增加了10%和5%。对比研究表明450℃是较好的退火处理温度,获得的较优综合匹配性能分别为615 MPa/59.5%IACS（450℃×1 h,η=8.19）、1008 MPa/53.3%IACS（450℃×1 h,η=9.93）,并分析了其原因。
关键词:
Cu-Fe复合材料
,
形变热处理
,
抗拉强度
,
导电率
,
微观组织
W. Chen
,
Y.Z. Zhang
,
C.J. Zhang
,
L.G. Zhu
金属学报(英文版)
The aim of this study is to simulate the solidification process of beam blank continuous casting, and then find the reasons for the typical defects of the beam blank. A two-dimensional transient coupled finite element model has been developed to compute the temperature and stress profile in beam blank continuous casting. The enthalpy method is used in the heat conduction equation. The thermo-mechanical property in the mushy zone is taken into consideration in this calculation. It is shown that at the mold exit the thickness of the shell has its maximum value at the flange tip and its minimum value at the fillet. The temperature has a great fluctuation on the surface of the beam blank in the secondary cooling zone. At the unbending point, the surface temperature of the web is in the brittleness temperature range under the present condition. To ensure the quality, it is necessary to weaken the intensity of secondary cooling. At the mold exit the equivalent stress and strain have higher values at the flange tip and at the web. From the spray 1 to the unbending point, the maximum values of stress and strain gradually move to the internal section of the flange tip and the web. However, whenever, there are bigger stress and strain values near the flange tip and the web than in the other parts, it must be very easy to generate cracks at those positions. Now, online verification of this simulation has been developed, which has proved to be very useful and efficient to instruct the practical production of beam blank continuous casting.
关键词:
beam blank
,
null
,
null
,
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