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通过对带裂纹的16Mn钢三通原材料检验未发现材料化学成分及力学性能等异常,但显微组织存在严重的带状组织。采用金相显微镜和扫描电镜对裂纹试样进行分析,结果发现,裂纹沿表面带状组织进行扩展,在裂纹尖端发现大块夹杂物,且试样内沿裂纹扩展方向存在有较多的呈线状分布的夹杂物带。采用能谱仪对这些夹杂物进行能谱分析,分析结果表明这些夹杂物主要是氧化物和碳化物。这些夹杂物和材料中的严重的带状组织是裂纹产生的主要原因。
Through the inspection of cracked 16Mn steel tee material, no abnormalities such as chemical composition and mechanical properties of the material were found, but the microstructure had serious banded structure. The specimens were analyzed by optical microscopy and scanning electron microscopy. The results showed that the crack propagated along the surface ribbon structure, large inclusions were found at the tip of the crack, and there were more lines along the crack propagation direction Incidental distribution of inclusions. The energy spectrum of these inclusions was analyzed by energy dispersive spectroscopy, and the results showed that these inclusions were mainly oxides and carbides. These inclusions and materials in the serious banded tissue is the main reason for the crack.