Ci DING
金属学报(英文版)
15CrMnMoV rolled tube is applied to many critical parts of helicopter. The secondary hardening behavior of the steel which varied with the treating process is essential for further usage. In this paper, the secondary hardening behavior of water quenched, oil quenched and air cooled steel are compared. The precipitations of alloy carbides are analyzed by electrolytic extraction, X-ray diffraction, optical microscopy as well as scanning electron microscopy. Results show that the secondary hardening effect in the air cooled steel is higher than in the water quenched and oil quenched steel, but the toughness decreases more seriously, due to more precipitation of Mo2C and VC.
关键词:
15CrMnMoV steel
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Secondary hardening
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Alloy carbides
严书亭
物理测试
采用自制平面应力拉伸装置，通过扫描电镜，透射电子显微镜等分析测试方法对15CrMnMoV钢的淬火回火组织和淬火冷轧组织的断裂行为进行了研究。实验结果表明：具有冷轧组织试样的断裂阻力明显高于原始组织试样。利用复型的方法精确测定出裂纹长度，并计算得出能量释放率D△a的关系曲线，轧制试样在△a=40 μm时出现峰值，显微组织分析表明峰值产生的原因是弱界面开裂的结果。
关键词:
15CrMnMoV钢
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coldroll
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crack
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weak interface
