(1. 北京科技大學(xué) 材料先進(jìn)制備技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083；
2. 北京科技大學(xué) 新材料技術(shù)研究院，北京 100083)
摘 要: 采用熱冷組合鑄型(HCCM)水平連鑄技術(shù)制備具有軸向取向組織的BFe10-1-1管材，對(duì)管材進(jìn)行冷軋加工，研究管材的組織、織構(gòu)與性能的變化。結(jié)果表明：HCCM水平連鑄管材不需銑面便可直接冷軋加工；無(wú)中間退火的累積冷軋變形量可達(dá)80%以上；冷軋管表面質(zhì)量好，軋制過(guò)程中無(wú)裂紋、裂口和飛邊等缺陷；隨著變形量的增加，取向組織晶粒內(nèi)一次枝晶主干間距逐漸減小，由鑄態(tài)的100~200 μm減小到變形量60%時(shí)的10~20 μm；當(dāng)冷變形量為60%時(shí)，組織中可觀察到剪切帶，當(dāng)冷變形量為80%時(shí)，組織呈波浪狀，枝晶、晶界很難辨認(rèn)；冷軋過(guò)程中管材由鑄造織構(gòu)(主要取向{012}á ñ)、經(jīng)過(guò)渡型織構(gòu){012}á100ñ(變形量為20%)和{057}á ñ(變形量為40%)，轉(zhuǎn)變?yōu)樽冃瘟繛?0%時(shí)的Cube織構(gòu)，當(dāng)變形量為80%時(shí)轉(zhuǎn)變?yōu)镚織構(gòu)；隨著變形量的增加，冷軋管的抗拉強(qiáng)度和硬度分別由鑄態(tài)的234 MPa和70HV增加至變形量80%時(shí)的372 MPa和152HV，伸長(zhǎng)率由鑄態(tài)的46.5%降低至80%變形量時(shí)的13%。
關(guān)鍵字: BFe10合金；水平連鑄；熱冷組合鑄型；冷軋管；軋制織構(gòu)
（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
