TC21钛合金表面等离子渗Cr层的抗热震性能  

Thermal Shock Resistance of Chromized Layer on TC21 Alloy Prepared by a Double Glow Plasma Surface Alloying Technology

作　　者：胡荣耀 梁文萍[1] 缪强[1] 夏金姣 刘文[1] 潘晓阳[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211100

出　　处：《热处理》2016年第1期15-19,共5页Heat Treatment

基　　金：国家自然科学基金项目(51474131);江苏高校优势学科建设工程资助项目

摘　　要：采用双辉等离子表面冶金技术对TC21钛合金进行了渗铬处理。将渗铬和未渗铬的TC21合金试样重复在箱式电炉中于750℃加热15 min水冷。采用宏观检验、EDS、SEM和XRD分别观察分析了重复加热-冷却前渗铬层的表面形貌、显微结构和厚度,重复加热-冷却后渗铬和未渗铬试样的表面形貌,以探索通过渗铬提高TC21钛合金抗热震性能的可行性。结果表明,TC21合金渗铬层平整、致密,与基体结合为冶金结合,渗层厚度约为30μm;重复加热-冷却120次后,渗铬试样表面出现网状裂纹,而未渗铬试样表面则发生剥落。这说明渗铬可明显改善TC21钛合金的抗热震性能。TC21 titanium alloy sample was chromized by a double glow plasma surface alloying technology. The TC21 alloy samples chromized and not chromized were heated at 750 ℃ for 15 min in an electric box furnace and cooled in water repeatedly. The apparent pattern,microstructure and thickness of the chromized layer before repeated heating and water-cooling treatment,the apparent pattern of the samples chromized and not chromized after repeated heating and water-cooling treatment were observed and analyzed by means of macro-examination,EDS,SEM and XRD respectively,to explore whether the thermal shock resistance of the TC21 titanium alloy could be significantly improved by chromizing. The results show that the chromized layer of the TC21 alloy is smooth and dense,is metallurgically bonded to the substrate and as thick as about 30 μm. After being subjected to 120 repeated heating and water-cooling treatments,the surface of the sample chromized exhibits resillage,whereas the surface of the sample not chromized shows spalling,which indicates that the thermal shock resistance of the TC21 titanium alloy may be considerably improved by chromizing.

关 键 词：TC21钛合金 等离子表面冶金化技术 渗铬 抗热震性能 

分 类 号：TG156.8[金属学及工艺—热处理]