摘要
通过超塑拉仲试验(初始应变速率5×10^(-4)s^(-1))和对形变试样徽观形貌的观察,研究了高碳铬硅钢在650—800℃温度范围内的超塑性能.经过对拉伸数据的分析,发现该钢在所试验的温度范围都可超塑成形,其最佳超塑温度为973K。微观组织的分析表明,该钢在较低温度形变时的破坏为延性断裂,而在1073K 形变时的断裂则是空洞扩展造成的脆性断裂。文中还讨论了形变造成钢中渗碳体和晶粒粗化加速的机理。
The superplasticity of high Carbon steel containing Cr and Si was researched by means of tensile test (initial strain rate 5×10^(-4-s-1)) and observing the mierostrueture of specimens. After analysing the data of deformation, it was found that this steel can be superplastie formed in the temperature range we dealt with (923°K- 1073 °K),and the optimum temperature for superplastic formation was to be 923~K Through observing the microstructure of specimens,it was found that a lower temperature deformation induce a plastic repture, whlie a brittle is formed when deformed at 1073°K sinee the development of the rupture voida. The reason for the fast grouth of the carbides and grains was also discussed.
关键词
高碳铬硅钢
超塑性
温度
断裂
high carbon steel containing Cr and Si
superplasticity
temperature
rupture
