摘要
MS980是新型实用的马氏体先进高强钢,可用于生产冷弯方管。残余应力是方管的一项重要指标。应用X射线衍射方法对MS980冷弯方管的周向残余应力进行了测量,分析了周向残余应力在方管各个部位的分布情况,探讨了方管内角的残余应力,并研究了不同的圆角半径、热轧板和冷轧板、不同的成形工艺及酸洗时间对方管的周向残余应力分布的差异。研究结果表明,方管外表面的周向残余应力在角部是压应力,在直边的分布是拉应力。圆角半径、板料类型、工艺方式对残余应力的分布都有显著影响,而常规的酸洗对残余应力的影响较小。
MS980 is one of advanced high-strength steels, which has a great potential for producing square tubes. Residual stress plays a significant role in determining roll-formed members~ behavior and strength. An experimen- tal study on transverse residual stress of roll-formed shape with square section was conducted via X-ray diffraction method. The distribution of transverse residual stresses at different position in sections was measured and studied, and influence of cold-rolled-sheet and hot-rolled-sheet, different fillet radius, different processes, and different pickling time on circumferential residual stress distribution for square section was investigated. The experimental results show the transverse residual stresses are compressive stress in the corner portion and the tensile stress in the straight edge. Fillet radius, sheet, and process have a significant impact on the distribution of residual stress, but the conventional pickling hardly affects residual stress.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2013年第9期24-29,共6页
Journal of Iron and Steel Research
关键词
马氏体钢
辊弯成形
残余应力
方管
martensitic steel
cold roll forming
residual stress
square tube
