TC4钛合金低温固体稀土-硼共渗  

Pack RE-boronizing of TC4 titanium alloy at lower temperature

作　　者：雷丽[1] 李凤华[1] 李金生[1] 衣晓红[2] 奚正平[3] 樊占国[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819 [2]清华大学摩擦学国家重点试验室,北京100084 [3]西北有色金属研究院,陕西西安710016

出　　处：《金属热处理》2012年第2期101-105,共5页Heat Treatment of Metals

基　　金："863国家高技术研究发展计划"(2006AA06Z368)

摘　　要：研究了TC4钛合金在950℃低温(β转变温度以下)下进行固体稀土-硼共渗的渗层形貌、物相组成、组织性能及基体相变。结果表明,低温稀土-硼共渗,可使TC4钛合金表面获得实用的渗硼硬化层,由TiB2和TiB双相化合物组成。同1050℃高温稀土-硼共渗相比,低温渗硼层致密均匀无孔洞,而且硬度梯度和脆性得到进一步改善。低温渗硼后TC4基体为等轴组织,性能良好,能有效地防止高温(β转变温度以上)时β相形成粗晶。低温渗硼有效地改善渗层的性能,减小工件畸变。The morphology,composed phases,properties and phases transition of the matrix of rare earth boronized layer were studied at the lower temperature of 950 ℃（under β phase transition temperature）.The results show that the boronized layer consisting of TiB2 and TiB can be obtained on the surface of TC4 titanium alloys RE-boronized at lower temperature.The boronized layer is compact,uniform and less porous compared with that boronized at higher temperature of 1050 ℃（above β phase transition temperature）,and the hardness profile and brittleness are improved to a certain extent become good in function.Lower-temperature boronizing can effectively prevent the formation of coarse β phase which forms above β phase transition temperature,duplex microstructure is obtained in TC4 matrix,the diffusion layer properties are improved and the work piece distortion is reduced.

关 键 词：TC4钛合金 低温 固体渗硼 渗层 

分 类 号：TG156.87[金属学及工艺—热处理]