37Mn5连铸坯显微组织及断口形貌研究

Microstructure and fracture morphology of 37Mn5 continuous casting billet

针对包钢生产的37Mn5钢连铸坯,在Gleeble-1500D热模拟机上,进行热模拟,分析37Mn5在各温度阶段对应的显微组织;试样断口性质与塑性大小的变化规律;着重研究第Ⅲ脆性区(800～900℃)的脆化原因。试验结果表明:在1300～800℃区间存在两个脆性温度区,第Ⅲ脆性温度域为900～800℃,其Z=60.23%～29.61%;为指导37Mn5管坯钢的生产实践提供理论依据。

37Mn5 continuous casting billet was studied by Gleeble-1500D thermal simulation machine.The microstructures,the relation of fracture and ductility were analysed.The reason of brittleness in the third brittleness zone was emphatically investigated. The results indicate that there are two brittleness zones existing in the sample between 1 300 ℃ and 800 ℃. 900-800℃ is the third brittleness zone. Z=60.23%-29.61%,The results will provide theoretical foundation for 37Mn5 tube bloom steel production.