摘要
采用冷喷涂技术制备了致密的304不锈钢涂层材料.利用热模拟试验机对冷喷涂304不锈钢涂层材料在1000—1150℃压缩变形,研究变形温度对其变形抗力、组织和硬度的影响.结果表明,随着变形温度由1000℃上升到1150℃,冷喷涂304不锈钢涂层材料稳态变形抗力由315.4 MPa降低到187.9 MPa,硬度由332.8 HV_(0.2)降低到244.8 HV_(0.2),易变形区面积增大,自由变形区发生再结晶,裂纹减少.在上述变形条件下,热变形激活能Q为464 kJ/mol.冷喷涂304不锈钢涂层在1237—1265℃发生相变.
The dense 304 stainless steel coating material was fabricated by cold spraying tech- nology. The influence of deformation temperature on hot deformation behavior of cold sprayed 304 stainless steel coating material was investigated by thermo mechanical simulator. The re- sults showed that deformation resistance of cold sprayed 304 stainless steel coating material re- duced with the increment of deformation temperature. The steady-state deformation resistance reduced from 315.4 MPa to 187.9 MPa when deformation temperature increased from 1000 ℃ to 1150 ℃ with deformation rate 20 s-1 and deformation reduction 17.5%. The microsturcture of de- formation sample might be divided into easy, difficult and free deformation zones. The area of easy deformation zone increased and area of difficult deformation zone decreased when deformation temper- ature increased from 1000 12 to 1150 ~C. Recrystallization occurred at free deformation zone without cracking at 1150 ℃. DSC curve showed that phase transition of cold sprayed 304 stainless steel coating material occurred at 1237-1265 ℃. The mierohardness of cold sprayed 304 stainless steel coating ma- terial was 313.3 HV0.2, which was relatively high. The mierohardness of deformation samples reduced from 332.8 HV0.2 to 244.8 HV0.2 as the deformation temperature increased from 1000 ℃ to 1150 I2 with deformation rate 20 s-1 and deformation reduction 50%. The hot temperature deformationequation of cold sprayed 304 stainless steel coating material was obtained with defbrlnation temperature 1000 1150 ℃ and deformation rate 5 20 s-1. The value of hot t, emperature deformation activation energy was 464 kJ/mol under the deforination conditions.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期1275-1280,共6页
Acta Metallurgica Sinica
基金
国家重点基础研究发展计划项目2012CB932203
国家自然科学基金项目51171037和51134013资助~~
关键词
冷喷涂
304不锈钢
变形温度
高温变形
cold spraying, 304 stainless steel, dcfornmtion temperature, hot deformation
