对高强度22MnB5钢板采用快速电阻加热方法,并与传统炉子加热作比较,研究了钢板在加热过程中的组织演变规律.以炉子加热(～10℃/s)和电阻加热(～ 100 ℃/s)两种速率把试样加热到不同温度、保温不同时间后水淬,观察试样的显微组织并测试力学性能.结果表明,22MnB5钢板使用传统炉子加热时其过热度为70℃左右,电阻加热的过热度比炉子加热时增加了约50℃,加热温度达到各自临界转变温度后淬火组织为马氏体和少量铁素体.使用炉子加热到相应温度后保温一段时间,转变的奥氏体量比未保温的多10％左右.钢板电阻加热并淬火后其抗拉强度为1 536.4 MPa,延伸率为6.8％,达到超高强度钢板要求.
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