Shenhua SONG
,
Luqian WENG
材料科学技术（英文）
Quenching-induced phosphorus segregation to prior austenite grain boundaries in a 0.077 wt pct P-doped 2.25Cr-1Mo steel is examined using field emission gun scanning transmission electron microscopy (FEGSTEM). A phosphorus level of around 1.56 at. pct is observed for the water-quenched sample. In recognition of insufficiently high spatial resolution of the technique for grain boundary composition analysis, the measured results are corrected by an analytical convolution method. The corrected phosphorus segregation level may be up to about 4.7 at. pct. The quenching-induced phosphorus segregation is nonequilibrium segregation and the migration of vacancy-phosphorus complexes plays an important role in the kinetic process. For such a reason, the mechanism for migration of the complexes is discussed in some detail.
关键词:
Grain boundary
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刘保臣
,
申长雨
,
刘春太
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上官林建
材料导报
将短纤维增强注塑制品看作多层板并分析了注塑制品的有效弹性性能.采用Tandon-Weng模型计算了单取向短纤维增强复合材料的弹性性能,采用取向平均法计算了具有任意平面取向的单层板材料弹性常数,运用层合板理论建立了短纤维增强注塑材料的有效弹性模量计算模型.测定了特制试样中的纤维取向分布,计算了有效弹性模量,并与实验结果对比证明这种方法是有效的.
关键词:
纤维取向
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短纤维增强复合材料
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力学性能
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注射成型
