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80Mn14(0.77C、13.98Mn、0.43Si、0.050P、0.022S、0.15Cu)高锰钢的热轧工艺性能差,是凿岩中空钢用芯棒的生产和使用中遇到的主要技术问题。利用热模拟试验机测量80Mn14钢材的热塑性和抗拉强度,采用扫描电镜分析磷等元素的成分分布;利用激光共聚焦显微镜观察金相组织和晶粒度。结果表明,80Mn14钢在1215℃时的热塑性为零、晶界明显烧损;1100℃时晶粒度8级,在1200℃时晶粒严重粗化,晶粒度5级;在晶界烧损的样品中发现了明显磷偏析。因此,在1215℃以上或附近,用铸钢坯(锭)轧制80Mn14钢材不合适宜;磷的偏析是80Mn14高锰钢可轧性差的主要原因。
The hot rolling process performance of 80Mn14 (0.77C, 13.98Mn, 0.43Si, 0.050P, 0.022S, 0.15Cu) high manganese steel is poor, which is the main technical problem encountered in the production and use of mandrel for hollow steel for rock drilling. Thermomechanical testing machine was used to measure the thermoplasticity and tensile strength of 80Mn14 steel. The composition distribution of phosphorus and other elements was analyzed by scanning electron microscopy. The microstructure and grain size were observed by laser confocal microscopy. The results show that the microstructure of 80Mn14 steel is zero at the temperature of 1215 ℃, and the grain boundary obviously burns. The grain size of the 80Mn14 steel is 8 grades at 1100 ℃, the grains are coarsened and the grain size is 5 at 1200 ℃. Significant phosphorus segregation was found in the samples. Therefore, at or above 1215 ℃, the use of cast billet (ingot) rolling 80Mn14 steel inappropriate; phosphorus segregation is 80Mn14 high manganese steel rolling is the main reason for the poor.