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为了进一步研究镧对低碳微合金高强钢的影响,利用德国产的L87RITA淬火膨胀仪,光学显微镜和维氏硬度计,绘制出了添加镧和不含镧两种低碳微合金钢的TTT曲线。根据测得的TTT曲线,研究分析镧对组织硬度、TTT曲线的影响。结果表明,镧对低碳微合金钢的等温转变有较大影响。在625℃和600℃等温,均获得了以针状铁素体为主显微组织,600℃以下的等温转变过程,镧抑制针状铁素体的转变;两种成分的低碳微合金钢的TTT曲线上均有两个“C”型,其相互重叠,没有河湾区。添加镧缩短了相变孕育期,同时极大的延迟了相转变结束时间,达到2~5小时。
In order to further study the effect of lanthanum on low-carbon micro-alloyed high-strength steels, TTT curves of lanthanum-added and non-lanthanum-containing low carbon microalloyed steels were drawn by L87RITA quench dilatometer, optical microscope and Vickers hardness tester . According to the measured TTT curve, the effect of lanthanum on the tissue hardness and TTT curve was analyzed. The results show that lanthanum has a great effect on the isothermal transformation of low carbon microalloyed steels. At 625 ℃ and 600 ℃ isothermal, all obtained acicular ferrite-based microstructure, the isothermal transformation process below 600 ℃, lanthanum inhibited acicular ferrite transformation; two components of low carbon microalloyed steel There are two “C” patterns on the TTT curve that overlap with each other without the river bay. Addition of lanthanum shorten the phase transition period, while greatly delayed the phase transition end time, reaching 2 to 5 hours.