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本文研究了锰和硅在下列大锻件用钢中的作用:A508C2,CrMoVNiCrMoV和2(1/4)Cr-1Mo钢。每一种钢都在给定化学成分范围内进行大截面模拟热处理,以保持同大锻件相似的组织和硬度,因而很具有代表性。总的说来,锰含量低些,有助于细化原始奥氏体晶粒,改善纯净度、抗回火脆性和抗应力腐蚀性能,提高上平台能和蠕变断裂韧性。但除了NiCrMoV钢以外,每一种含锰低的钢,都发现贝氏体淬透性有所降低。除了低硅锻件用钢的已知优点以外,还发现低硅可以增加贝氏体淬透性,较低的硅和锰都对室温低周疲劳或疲劳裂纹扩展性能没有影响。
In this paper, the effect of manganese and silicon on steels for large forgings has been studied: A508C2, CrMoVNiCrMoV and 2 (1/4) Cr-1Mo steels. Each steel is within a given chemical composition of large cross-section simulated heat treatment to maintain the same forgings and hardness of the organization, it is very representative. In general, the low manganese content helps to refine the original austenite grain, improve the purity, temper embrittlement resistance and stress corrosion resistance, and improve the upper deck and creep rupture toughness. However, with the exception of NiCrMoV steels, the hardenability of bainite was found to be reduced for every low manganese steel. In addition to the known advantages of low-silicon forgings, low-silicon additions have been found to increase bainitic hardenability, with lower silicon and manganese all having no effect on room temperature low cycle fatigue or fatigue crack growth performance.