55NiCrMoV7钢的过冷奥氏体连续冷却转变曲线Continuous cooling transformation curves of undercooled austenite of 55NiCrMoV7 steel
元亚莎,石如星,元莎,王文焱,汪雨昌,庞庆海
摘要(Abstract):
采用Formastor-FⅡ型膨胀仪测量了55NiCrMoV7钢以不同速度连续冷却时的膨胀曲线,利用膨胀法与金相—硬度法,确定了相变温度点,绘制出了试验钢的过冷奥氏体连续冷却转变曲线(CCT曲线),分析了冷却速度对其相变组织、CCT曲线和显微硬度的影响。结果表明:试验钢可以在较宽的冷却速度范围内得到马氏体组织,当冷却速度大于0.25℃/s时,连续冷却转变获得单一的马氏体组织;随冷却速度的增加,试验钢的显微硬度增大,这是由于冷却速度增加,促使了连续冷却转变后的组织细化。
关键词(KeyWords): 55NiCrMoV7钢;CCT曲线;连续冷却;相变
基金项目(Foundation): 国家重点研发计划(2020YFB2008400)
作者(Author): 元亚莎,石如星,元莎,王文焱,汪雨昌,庞庆海
DOI: 10.13289/j.issn.1009-6264.2021-0416
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