易凯
,
耿东兵
,
杨智勇
,
杨坚
,
贺晔红
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2015.02.014
探索研究了F-8H3/602芳纶织物增强树脂基复合材料层合板不同树脂含量对其冲击韧性、层间剪切强度及弯曲性能的影响,并采用显微镜及扫描电镜对破坏试样形貌进行观察.结果表明芳纶复合材料的树脂含量对其冲击韧性、层间剪切强度及弯曲性能影响较为明显,树脂含量为46.02wt％的芳纶复合材料层合板的0°冲击韧性为22 J/cm2、0°层间剪切强度为49.1 MPa、0°弯曲强度为506 MPa;在一定的树脂含量下,芳纶复合材料的0°冲击韧性、层间剪切强度及弯曲性能较90°的性能更优异;破坏试样的形貌表明纤维与树脂界面结合较为薄弱.
关键词:
芳纶复合材料
,
树脂含量
,
冲击韧性
,
层间剪切强度
,
弯曲性能
Chunfang WANG
,
Maoqiu WANG
,
Jie SHI
,
Weijun HUI
,
Han DONG
材料科学技术（英文）
Martensitic microstructure in quenched and tempered 17CrNiMo6 steel with the prior austenite grain size ranging from 6 μm to 199 μm has been characterized by optical metallography (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The yield strength and the toughness of the steel with various prior austenite grain sizes were tested and correlated with microstructure characteristics. Results show that both the prior austenite grain size and the martensitic packet size in the 17CrNiMo6 steel follow a Hall-Petch relation with the yield strength. When the prior austenite grain size was refined from 199 μm to 6 μm , the yield strength increased by 235 MPa, while the Charpy U-notch impact energy at 77 K improved more than 8 times, indicating that microstructure refinement is more effective in improving the resistance to cleavage fracture than in increasing the strength. The fracture surfaces implied that the unit crack path for cleavage fracture is identified as being the packet.
关键词:
Martensitic steel
,
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