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对国产和德国产两种新型鱼尾板材料在室温和低温下的拉伸性能和冲击性能进行了对比研究;用扫描电镜观察不同温度下拉伸断口和冲击断口的形貌,并讨论了材料的断裂方式。结果表明:两种材料均为低合金钢;室温和低温下的拉伸、冲击性能均高于国内现用的B7钢及日本产鱼尾板材料,在室温和-55℃下,国产材料的屈服强度、伸长率分别为568,700 MPa和22.0%,21.5%,德国产材料屈服强度、伸长率分别为615,675 MPa和24.4%,22.0%;德国产鱼尾板材料力学性能比国产材料稳定。
Tensile properties and impact properties of two new types of fish plate materials made in China and Germany at room temperature and low temperature were compared. The morphologies of tensile and impact fractures at different temperatures were observed by scanning electron microscopy. The way of breaking. The results show that the two materials are low alloyed steel. The tensile and impact properties at room temperature and low temperature are higher than those of B7 steel and Japanese fishplates currently used at home and abroad. At room temperature and -55 ℃, Yield strength and elongation were 568,700 MPa and 22,0% and 21.5%, respectively. The yield strength and elongation of German-made materials were 615,675 MPa and 24.4% and 22.0% respectively. The mechanical properties of German-made fishplate materials were more stable than those of domestic materials.