通过对应变硬化指数、拉伸试验数据和微观晶粒形貌等进行分析, 讨论了引伸计控制期间真应变在0.8%～1.6%, 速率控制模式对GH4169高温合金室温(23±5) ℃及高温(650±3) ℃拉伸性能的影响。结果表明: 室温下, 应变控制模式测得的强度指标高于横梁位移控制模式测得的, 而应变控制模式测得的塑性指标低于横梁位移控制模式测得的; 高温下, 应变控制模式与横梁位移控制模式测得的强度指标和塑性指标差异均可以忽略不计。

The influence of rate control modes during extensometer control with true strain of 0.8%-1.6% on the room temperature (23±5) ℃and elevated temperature (650±3) ℃ mechanical properties of GH4169 superalloy, were studied by analyzing the strain hardening index, tensile test data and micro grain morphology. The results show that at room temperature, the strength index obtained by strain control mode was higher than that obtained by displacement control mode, as well as the plastic index obtained by strain control mode was lower than that obtained by displacement control mode. At the elevated temperature, the difference between the strength index and the plastic index obtained by strain control mode and displacement control mode could be ignored.