加热温度对轧制钛/钢复合板组织与性能的影响  

Effect of Heating Temperature on Microstructure and Mechanical Properties of Titanium Clad Steel by Hot Roll Bonding

作　　者：柴希阳[1,2] 师仲然 柴锋 苏航[1] 杨志刚[2] 杨才福[1] Chai Xiyang;Shi Zhongran;Chai Feng;Su Hang;Yang Zhigang;Yang Caifu(Central Iron and Steel Research Institute,Beijing 100081,China;Tsinghua University,Beijing 100084,China)

机构地区：[1]钢铁研究总院,北京100081 [2]清华大学,北京100084

出　　处：《稀有金属材料与工程》2019年第8期2701-2710,共10页Rare Metal Materials and Engineering

基　　金：国家国际科技合作专项项目（2015DFR50320）;国家高技术研究发展计划（“863”计划）（2015AA03A501)

摘　　要：组装钢/钛/隔离剂/钛/钢对称结构复合板坯,研究了加热温度(850~1000℃)对轧制钛/钢复合板显微组织、基材强韧性和界面结合性能的影响。结果表明,随着加热温度的升高,界面剪切性能逐步下降。加热温度影响着界面反应相的种类和厚度。在850、875、900℃条件下,轧后冷却扩散过程中,C在结合界面富集能力强,Fe在Ti中反应扩散弱,结合界面形成β-Ti和TiC;在925和950℃条件下,C在结合界面富集能力弱,Fe在Ti中反应扩散强,结合界面形成α-βTi、β-Ti、TiC和Fe2Ti;在1000℃条件下,Fe在Ti中的反应扩散进一步增强,结合界面形成α-βTi、β-Ti、TiC、FeTi和Fe2Ti。脆性反应相的厚度与加热温度呈正相关关系。脆性相种类和厚度增加使得钛/钢复合板界面抗剪切强度出现下降。A symmetry slab of steel/titanium/separating agent/titanium/steel was assembled for fabricating titanium clad steel by hot roll bonding.The effect of heating temperature on microstructure,strength-toughness and bonding properties of clad steel plates were investigated at condition of 850-1000 ℃.The results show that with the increase of temperature,the shear strength decreases obviously.The heating temperature has an important effect on the variety and thickness of interfacial phase.At temperatures of 850,875 and 900 ℃,carbon can easily enrich at the bonding interface and the reaction diffusion of Fe in titanium is weak.Consequently,TiC and fi-Ti form at the Ti/steel interface.While at temperatures of 925 and 950 ℃,carbon enrichment at bonding interface stays at low degree and the diffusion reaction of Fe in titanium is strong.As a result,α-β Ti,β-Ti,TiC and Fe2 Ti are generated at bonding interface.At temperature of 1000 ℃,the diffusion reaction of Fe in titanium gets stronger.Therefore,the interface products consisted of α-β Ti,β-Ti,TiC,FeTi and Fe2 Ti form.In addition,the increase of heating temperature promotes the rise of brittle phase layer thickness.The reduction of shear strength is attributed to the increase of variety and thickness of brittle phase.

关 键 词：加热温度 轧制复合 钛/钢复合板 界面反应相 

分 类 号：TG335.85[金属学及工艺—金属压力加工]