In the present paper, both the process and new grain boundary of austenite recrystallized of 300m ultrahighstrengthsteel have been Oserved in-situ by means of high-temperature metalloscope and tem.
运用高温金相和TEM方法，对超高强度钢300m的奥氏体相变再结晶过程和新晶界进行了定位观察。
2
The experimental results show that the coldworked holes significantly extend the fatigue life of ultra-highstrengthsteel.
试验结果表明，孔冷挤压显著提高两种超高强度钢的疲劳飞行寿命。
3
Meta bainite is also a desirable matrix for development of highstrengthultra grade steel.