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对制动梁用15Mn2CrVNb钢的铸坯角部横裂纹缺陷进行了研究,研究表明铸坯角横裂纹的形成温度为870～900℃,在这一温度条件下铌、钒等碳、氮化物析出以及铁素体在奥氏体晶界析出引起的奥氏体晶界脆化是裂纹形成的内部原因,而铸坯矫直过程中内弧侧的张应力是裂纹形成的外部原因,实践表明提高连铸坯的角部温度能够有效地避免铸坯角部横裂纹的产生。
The transverse crack defects of 15Mn2CrVNb steel in the billet of the brake beam were studied. The results show that the formation temperature of the transverse crack in the cast slab is 870-900 ℃, and the precipitation of carbon and nitride such as niobium and vanadium at this temperature And austenite grain boundary embrittlement caused by the precipitation of ferrite at austenite grain boundaries are the internal causes of crack formation. The tensile stress on the inner arc side in the straightening process is the external cause of crack formation. Practice shows that the increase The corner temperature of the billet can effectively prevent the occurrence of transverse cracks in the corner of the slab.