Electro-Superplastic Compression Behavior of Ultrahigh Carbon Steel and Its Electro-Superplastic Welding with 40Cr Steel
Taking the 1.6％C ultrahigh carbon steels (UHCS) with ultrafine structures developed through thermo-mechanical treatment as a research object, the effect of electric field intensity and initial strain rate on the superplasticity of the UHCS were studied by means of the electro-superplastic compression test, and the possibility of 40Cr and UHCS electro-superplastic welding was discussed. The experimental results indicate that the stress-strain curves of UHCSs are shown to take place obvious compressive superplastic flow characteristic at the temperature of 780 ℃ and the initial strain rate of (0.5-5.0)× 10-4s-1 in the manner of the specimen connected to positive terminal and the ring electrode connected to negative terminal, the strain rate sensitivity is 0.46. With the electric field intensity of 3kV/cm, the steady superplastic flow stress of the UHCS decreases more than 10％. The electro-superplastic welding of 40Cr steel and UHCS can be carried out with the conditions of the pre-pressed stress of 56.6 Mpa, initial strain rate of 1.5×10-4s-1, welding temperature of 780℃ and electric field intensity of 0.5kV/cm, and the strength of the joint is up to 498MPa, increased more than 50％ compared without electric field.
steel electric field superplasticity solid state welding
ZHANG Ke-ke MA Ning ZHANG Zhan-ling YUE Yun SUN Jing WU Zhi-wei YANG Yun-lin
School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 47100 School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 47100
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
200-203
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）