42CrMo钢特厚椭圆坯轧制工艺数值模拟
Numerical simulation for rolling process of ultra-heavy elliptical billet of 42CrMo steel
白丽琴 1孙宪进 2吴扬 2何广霞 2谢振家 3尚成嘉3
作者信息
- 1. 北京科技大学钢铁共性技术协同创新中心,北京 100083
- 2. 江阴兴澄特种钢铁有限公司研究院特板研究所,江苏 江阴 214429
- 3. 北京科技大学新金属材料国家重点实验室,北京 100083;阳江合金材料实验室,广 东阳江 529500
- 折叠
摘要
特厚模具钢因具有卓越的性能和可靠的使用寿命,在制造大型模具中起着不可替代的作用.然而,在连铸过程中,铸坯内部可能形成的缺陷对模具钢的力学性能和使用寿命造成严重影响.设计合理轧制工艺提高芯部变形是改善芯部缺陷的重要途经之一.针对大直径椭圆连铸坯轧制成特厚钢板的开坯粗轧、平整成型及精轧3个过程,采用有限元数值模拟的方法研究了不同轧制工艺对42CrMo特厚钢板不同位置的累积变形量、单道次变形量以及钢板成材率的影响.利用材料性能计算软件JMatPro计算了 42CrMo钢的高温变形行为和热导率、比热容、密度、弹性模量、泊松比等物理参数,采用ABAQUS软件进行轧制有限元模拟分析了轧制道次压下量对椭圆坯内部疏松压合的影响规律.结果表明,开坯粗轧的前3道次压下量变化对芯部变形影响不大,芯部变形量主要取决于精轧阶段单道次压下量.采用前3道次较小压下量开坯加后5道次较大压下量精轧,芯部累积变形量最大,达1.5,且最后5道次中每道次的应变量均大于0.14,可以有效提高大规格椭圆坯轧制的特厚板芯部变形渗透率,有利于芯部裂纹和疏松等铸坯缺陷的改善.
Abstract
Ultra-heavy die steels play an irreplaceable role in the manufacturing of large dies due to their excellent performance and reliable service life.However,during the continuous casting process,the defects that may form in-side the billet have a serious impact on the mechanical properties and service life of the die steel.Designing a reason-able rolling process to achieve large deformation in the core is one of the important ways to modify core defects.The finite element numerical simulation method was used to study the effects of different rolling processes on the accu-mulated deformation,single pass deformation at different positions and the yield of 42CrMo ultra-heavy steel plate,focusing on the three stages of rough rolling,flat forming,and finishing rolling of large-diameter elliptical continu-ous casting billets.The high-temperature deformation behavior and physical parameters such as thermal conductivi-ty,specific heat capacity,density,elastic modulus,and Poisson's ratio of 42CrMo steel were calculated using the material performance calculation software JMatPro.ABAQUS software was used for rolling finite element simula-tion to analyze the influence of rolling pass reduction on the internal loose compression of elliptical billets.The re-sults show that the changes in the first three passes of rough rolling have little effect on the deformation of the cen-ter,and the deformation of the center mainly depends on the single pass reduction during the finishing rolling stage.Using the first 3 passes with a smaller reduction in rough rolling and the last 5 passes with a larger reduction in fin-ishing rolling,the accumulated deformation at the center is the highest,reaching 1.5.Moreover,the strain in each of the last 5 passes is greater than 0.14,which can effectively improve the deformation permeability of the thick plate center during the rolling of large-size elliptical billets,and is conducive to the improvement of casting defects such as center cracks and looseness.
关键词
42CrMo钢/椭圆坯/轧制/有限元模拟/特厚板Key words
42CrMo steel/elliptical billet/rolling/finite element simulation/ultra-heavy plate引用本文复制引用
基金项目
中央高校基本科研业务费专项(FRF-BD-23-01)
国家重点研发计划(2016YFB0300400)
出版年
2024
NETL
NSTL
万方数据