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本文研究了应变速率和冷却剂状态对4K时许多奥氏体钢不连续屈服特性的影响,发现在4K的液氦中,作为应变速率的函数的不连续屈服起始应力和起始应变的变化;在4K的气态氦中比起在液态氦中,出现不连续屈服时的应力和应变要低得多.这些结果可以用宏观的热平衡和由运动位错引起的局部发热原理来解释.
In this paper, the effect of strain rate and coolant state on the discontinuous yield characteristics of many austenitic steels at 4K was investigated. It was found that the discontinuous yield stress and initial strain change as a function of strain rate in 4K liquid helium ; The stress and strain at discontinuous yield appear much lower in gaseous helium at 4K than in liquid helium.These results can be explained by the macroscopic thermal balance and local heating due to motion dislocations.