The impact fracture surface showed a tough morphology for POM/NBR/Novolak blends and brittle one for POM/NBR blends.
断裂形貌考察表明，POM/ NBR共混物的断裂面呈脆性断裂特征；
The results show that after post-weld heat treatment(PWHT), the welds of X80 steel seriously embrittle, and the fracture morphology of impact specimens is cleavage.
结果表明，经过焊后热处理后焊缝出现严重的低温脆化，其冲击试样的断口为解理状形貌；
The impact fracture surface morphology observed by SEM showed that the toughening mechanism of the blend was in accordance with that of the shear yielding.
共混体冲击断面形貌的SEM分析表明其增韧机理为剪切屈服机理。
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