Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第9期    总第162期    2012年9月

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文章编号:1004-0609(2012)09-2529-10
轴向取向组织BFe10-1-1管材冷轧加工过程中组织、织构与力学性能的变化
梅  俊,刘新华,姜雁斌,谢建新

(1. 北京科技大学 材料先进制备技术教育部重点实验室,北京 100083;
2. 北京科技大学 新材料技术研究院,北京 100083
)

摘 要: 采用热冷组合铸型(HCCM)水平连铸技术制备具有轴向取向组织的BFe10-1-1管材,对管材进行冷轧加工,研究管材的组织、织构与性能的变化。结果表明:HCCM水平连铸管材不需铣面便可直接冷轧加工;无中间退火的累积冷轧变形量可达80%以上;冷轧管表面质量好,轧制过程中无裂纹、裂口和飞边等缺陷;随着变形量的增加,取向组织晶粒内一次枝晶主干间距逐渐减小,由铸态的100~200 μm减小到变形量60%时的10~20 μm;当冷变形量为60%时,组织中可观察到剪切带,当冷变形量为80%时,组织呈波浪状,枝晶、晶界很难辨认;冷轧过程中管材由铸造织构(主要取向{012}á ñ)、经过渡型织构{012}á100ñ(变形量为20%)和{057}á ñ(变形量为40%),转变为变形量为60%时的Cube织构,当变形量为80%时转变为G织构;随着变形量的增加,冷轧管的抗拉强度和硬度分别由铸态的234 MPa和70HV增加至变形量80%时的372 MPa和152HV,伸长率由铸态的46.5%降低至80%变形量时的13%。

 

关键字: BFe10合金;水平连铸;热冷组合铸型;冷轧管;轧制织构

Evolution of microstructure, texture and mechanical properties of BFe10-1-1 tube with microstructure along axial orientation during cold-rolling
MEI Jun, LIU Xin-hua, JIANG Yan-bin, XIE Jian-xin

1. Key Laboratory for Advanced Materials Processing, Ministry of Education,
University of Science and Technology Beijing, Beijing 100083, China;
2. Institute for Advanced Materials and Technologies, University of Science and Technology Beijing,
Beijing 100083, China

Abstract:BFe10-1-1 cupronickel tubes with the microstructure along axial orientation were fabricated by a heating-cooling combined mold (HCCM) technology. The tubes were cold-rolled to study the evolution of microstructure, texture and mechanical properties during cold rolling. The results show that the tubes produced by the HCCM can be directly used for subsequent cold rolling without surface milling and the accumulated cold-rolling deformation approaches to 80% without intermediate annealing. The cold-rolled tubes have good surface quality without defects of crack, breach and flash. The primary dendrite arm space in the oriented grains decreases gradually with an increase in the deformation, i.e. 100−200 μm of the casting tube is decreased to 10−20 μm of the tube with 80% deformation. When the deformation reaches 60%, the shear band can be observed, and when the deformation reaches 80%, the grain is of a wavy-structure, and the dendrite and grain boundary are difficult to be identified. During cold rolling, the cast texture of the casting tube (main orientation{012}á ñ) transforms into Cube texture after 60% deformation and into G texture after 80% deformation, through the transition type textures of {012}á100ñ (20% deformation) and {057}á ñ (40% deformation). With increasing the deformation, the tensile strength (243 MPa) and hardness (70HV) of the casting tube are increased to 372 MPa and 152HV of the tube with 80% deformation, respectively, while the elongation (46.5%) of the casting tube is reduced to 13% of the tube with 80% deformation.

 

Key words: BFe10 alloy; horizontal continuous casting; heating-cooling combined mold; cold-rolled tube; rolling texture

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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