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。
2
Aiming at these problems, taking D406A steel as an example, this paper systematically studied the fracture behavior of the ultra-highstrengthsteel and it's welded joint.
针对这两种现象，本文以D406A钢为例，系统地研究了超高强度钢及其焊接接头的断裂行为。
3
Meta bainite is also a desirable matrix for development of highstrengthultra grade steel.