利用粘结(Bonding)试验方法,在Gleeble-3800热模拟试验机上进行加热加压试验,研究了不同夹杂物(Ti2O3、TiO2、TiN)在钢-夹杂物界面处的作用效应,同时探讨了铁素体的形核机理.结果表明,在Fe-1.50％ Mn-0.20％ Si合金体系下,C、Si、Mn元素均对A3温度和铁素体相变驱动力存在显著影响.在焊接热循环作用下,不同夹杂物在钢-夹杂物界面处的作用效应不同,其诱导铁素体形核的机理也存在差异.其中Ti2O3粉末在界面上不发生反应,但通过吸收粉末与基体界面附近区域的Mn形成贫Mn区,促进了铁素体相变；TiO2粉末在界面上与钢发生化学反应,造成界面附近形成贫Mn区、贫Si区,并且贫Mn对A3温度提高的影响远大于贫Si对A3温度降低的影响,所以促进了铁素体相变；TiN粉末在界面上和钢不发生反应,也不能促进铁素体相变.
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