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作者研究了化学成分及热处理条件对3Cr-1Mo特厚锻钢件的影响。如果在形成贝氏体组织的冷却速度范围内对这种锻件进行淬火回火,可以得到较好的强度和韧性,而且铁素体的析出量也急剧降低。因此,可以明显看出3Cr-1Mo特厚锻钢件的化学成分对铁素体析出的临界冷却速度、贝氏体组织的强度和韧性的影响。同样可见,回火脆性的敏感性与(2Si+Mn)(10P+5Sb+4Sn+As)×10~2有密切的关系,因此降低Si、Mn及杂质元素的含量是很重要的。基于以上原理,在制造壁厚达480mm的特厚型锻钢件时,获得了良好的性能。
The author studied the chemical composition and heat treatment conditions 3Cr-1Mo super thick forgings. If such a forging is quenched and tempered within the cooling rate range for forming bainitic structure, good strength and toughness are obtained, and the amount of precipitation of ferrite is also drastically reduced. Therefore, it is obvious that the chemical composition of the 3Cr-1Mo ultra-thick forgings has an effect on the critical cooling rate of ferrite precipitation, the strength and toughness of the bainite structure. Similarly, the sensitivity of temper brittleness is closely related to (2Si + Mn) (10P + 5Sb + 4Sn + As) × 10-2, so it is important to reduce the content of Si, Mn and impurity elements. Based on the above principle, good properties are obtained when manufacturing thick forged steel members having a wall thickness of 480 mm.