非真空复合轧制的实验工艺研究

Research on composite rolling in non-vacuum environment

为研究非真空环境下复合轧制的实验工艺,对某种低碳微合金钢组坯在氩气环境下焊接后进行复合轧制,对轧后复合板界面结合处进行组织以及力学性能检测。非真空轧制板材具有少量的缺陷并集中于板材末端;界面结合处未发现原始痕迹,且无由于氧化而产生的孤立状非结合部位;结合度实验未发现肉眼可见的剥离裂纹;界面结合强度实验表明界面结合强度随累计压下率的增加而增加;对拉剪位置断裂的断口分析可知,在压下率较低时界面结合处保持原有试样形貌,且断口处未发现夹杂物。实验结果表明非真空复合轧制实验工艺板材力学性能良好。

To study the composite rolling in non-vacuum environment, low carbon micro-alloy steel billets welded under an argon atmos- phere was carried on for composite rolling, and then the mechanical properties and metallographic structure of the composite plate at the interface bonding were tested. Non-vacuum composite rolling plate had several defects located in the bottom of the plate. The original traces were not found in the interface bonding, and the isolated non-bonding sites produced by oxidizing oxy-gases were not formed. The peel cracks in the specimen were not found in the bonding experiments. The interface bonding test shows that the plate interface bonding strength increases with the increase of cumulative pressing rate. The original morphology is maintained in the interface bonding at low cu- mulative pressing rate by the analysis of fracture which locates in shearing surface, and there are no inclusions found in the fracture. The resuhs show that composite rolling in non-vacuum environment can produce the plate with good mechanical properties.