胡文莉,侯娅丽,邹宗晏,赵金华,黄志权,马立峰

• 1:太原科技大学机械工程学院
• 2:太原科技大学重型机械教育部工程研究中心
• 3:山西北方晋东化工有限公司

摘要(Abstract)：

采用高分辨热膨胀相变仪研究了EH47止裂钢过冷奥氏体等温冷却条件下的相变行为，利用扫描电镜(SEM)对试验钢在不同相变条件下的微观组织特征进行表征，基于获得的膨胀量曲线变化规律及微观组织特征，讨论了试验钢在不同等温相变条件下过冷奥氏体的演变规律。结果表明：在40℃/s冷却速率下，试验钢的相变开始温度为628～636℃;当等温相变温度介于630～570℃时，试验钢过冷奥氏体在等温转变过程中出现相变不完全现象；当等温温度为600和570℃时，试验钢的相变产物为由针状铁素体(AF)、贝氏体铁素体(BF)、粒状贝氏体(GB)及马氏体(M)组成的复相组织；当等温温度为540、510和480℃时，试验钢相变产物为由AF、贝氏体(B)及GB组成的复相组织，M消失。对于试验用EH47止裂钢而言，为了获得由AF、BF及GB构成的复相组织，需保证等温温度介于540～480℃,等温时间不少于10 min,以避免相变产物中出现M等组织。

关键词(KeyWords)： EH47止裂钢;等温相变;过冷奥氏体

Abstract:

Keywords:

基金项目(Foundation): 太原科技大学博士科研启动基金(20232023);; 国家自然科学基金青年基金项目(52304409)

作者(Author): 胡文莉,侯娅丽,邹宗晏,赵金华,黄志权,马立峰

DOI: 10.13289/j.issn.1009-6264.2024-0227

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