控轧工艺对低压缩比高强度特厚钢板组织性能的影响  

Effect of Controlled Rolling Process on Microstructure and Mechanical Properties of Super-thick Steel Plate with Low Compression Ratio

作　　者：张莉芹[1] 李德发[2] 吴开明[1] 

机构地区：[1]武汉科技大学理学院,湖北武汉430081 [2]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《热加工工艺》2014年第23期54-56,60,共4页Hot Working Technology

摘　　要：采用TMCP(Thermo Mechanical Control Process)工艺制备了厚度100 mm的低合金高强度钢板,通过性能检验、光学显微镜和TEM研究了低压缩比控轧工艺对试验钢板不同厚度处力学性能及微观组织结构的影响。结果表明,在总压下率一样时,随着奥氏体再结晶区累积压下率增加,钢板不同厚度处性能差异减小。奥氏体再结晶区累积压下率达到50%时,奥氏体晶粒细化可充分渗透至中心部位,改善了组织的均匀性。未再结晶区压下率增加对特厚板中心部位组织转变影响较小,但使厚度1/4处组织细化并促进位错和析出相生成,间接增加了钢板不同厚度处的性能差异。提出了改善钢板不同厚度处力学性能均匀性的建议,对低压缩比高强度特厚钢板的低成本制造具有指导意义。A low-alloyed high strength steel plates with 100mm thick ness were prepared by TMCP （thermo mechanical control process）. The effects of controlled rolling process with low compression ratio on the mechanical properties and microstructttre of the plate at different thicknesses were investigated by properties testing, OM and TEM analysis. The results indicate that, when the total reduction rate is the same, the properties difference of the plate at its different thicknesses reduces with the increasing of the accumulated reduction rate in Austenitic recrystallization zone. When the accumulated reduction rate in Austenitic recrystallization zone increases to 50%, the refinement of the Austenite grain can fully penetrate to the center of the plate, and then uniformity of the microstructure is improved. Increasing the reduction rate in non-recrystallization zone has a little effect on the central microstructure of the super-thick plate, but it can refine the grains at 1/4 thickness of the plate and lead to the formation of dislocation and precipitates in this thickness, then the properties difference of the plate at its different thicknesses is indirectly increased. A proposal for improving the mechanical properties uniformity of the plate at its different thicknesses was put forward, it has a guiding significance for reducing the preparation cost of super-thick high strength plate with low compression ratio.

关 键 词：低压缩比 高强度 特厚板 控轧工艺 组织性能 

分 类 号：TG335.5[金属学及工艺—金属压力加工] TG142.1[一般工业技术—材料科学与工程]