随着科技的进步与发展，以改变合金成分提高超高强度钢的强度和韧性已经很困难。本文以40CrNi2Si2MoVA钢为例，探讨了通过控制晶粒度尺寸提高钢强度和韧性的方法。%With the advancement and development of technology, it is very difficult to improve the strength and toughness of ultra-high-strength steel by the change of the composition of the alloy. This paper, taking the 40CrNi2Si2MoVA steel for example, discusses the method of improving the strength and toughness of the steel by controlling the crystal degree.
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