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高强度钢,强、韧性的最佳配合始终是设计、使用和研究这类材料首先考虑的问题之一,人们常希望在高强度状态下能有满意的韧性,以防止构件在工作中发生脆性断裂。约十年前,Zackay,Parker和Wood等对航空工业用AISI 43XX系列及一些简单成分的合金组织和性能之间的关系进行了系统的研究。试验表明:采用较通常淬火温度高出几百度的高温奥氏体化工艺,能在不损失强度的同时使韧性(K_(IC))较常规处理提高一倍左右。这一工艺的变革引起大家的注意。随后在300M钢及其它成分的低合金钢中也取得了同样效果。通过透射电镜的观察,针对上述
The optimal combination of high strength steel, strength and toughness has always been one of the first considerations in the design, use and study of such materials. It is often desirable to have satisfactory toughness under high strength to prevent frangibility fracture. About ten years ago, Zackay, Parker and Wood conducted a systematic study of the relationship between the microstructure and properties of the AISI 43XX series for aviation applications and some simple components. The results show that the high temperature austenitizing process with several hundred degrees higher than the normal quenching temperature can make the toughness (K_ (IC)) about twice that of the conventional one without losing the strength. The transformation of this process aroused everyone’s attention. The same effect was then achieved in the low-alloy steels of 300M steel and other components. Observed by transmission electron microscopy for the above