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高强度奥氏体不锈钢00Cr21Ni14Mo2Mn5N钢立焊冲击试验后出现韧性偏低的现象。利用低倍检测、扫描电镜能谱分析和金相显微镜对母材金相试样和冲击试样熔合线附近的组织进行了观察、检测和分析,指出韧性偏低现象与母材板厚中心偏析出的铌化物夹杂、带状组织有关。通过调查热处理制度和热处理炉的现实情况,发现是由于热处理温度偏低造成的。采用1 150℃固溶处理,虽然晶粒尺寸有不同程度的长大,但钢板冲击韧性偏低现象基本消失。采用热处理后的钢板进行焊接试验,热影响区韧性偏低现象不再出现,同时未改变焊接接头的耐腐蚀性能。
High strength austenitic stainless steel 00Cr21Ni14Mo2Mn5N steel after the impact of the impact of low toughness phenomenon. Using low magnification scanning electron microscopy (SEM) and scanning electron microscopy (EDEM) and metallographic microscope (SEM), the microstructures of metallurgical samples and impact samples near the weld line were observed, analyzed and analyzed. Out of niobium inclusions, ribbon-like organizations. By investigating the heat treatment system and the actual situation of the heat treatment furnace, it was found that due to the low heat treatment temperature. Adopting solid solution treatment at 1 150 ℃, although the grain size grew up in varying degrees, the low impact toughness of the steel plate basically disappeared. The heat treatment of the steel plate after welding test, heat-affected zone toughness no longer appear low, while not changing the corrosion resistance of welded joints.