INFLUENCE OF MICROSTRUCTURE ON IMPACT TOUGHNESS OF G18CrMo2-6 STEEL DURING TEMPERING
Received date: 2013-11-19
Revised date: 2014-02-12
Online published: 2014-07-20
以核电汽轮机缸体用G18CrMo2-6耐热钢为研究对象, 分析了显微组织、第二相类型、形貌、尺寸和分布随回火温度的变化及其对冲击韧性的影响. 结果表明, G18CrMo2-6钢正火经不同冷速冷却后得到不同的基体组织, 经680 ℃回火后, 冲击韧性均远高于指标要求, 因此基体组织差异不是导致冲击韧性急剧恶化的决定性因素. 经炉冷正火后在560~710 ℃区间回火, 显微组织均为铁素体+回火贝氏体, 随回火温度上升, 室温冲击韧性增加. 经560和600 ℃回火后, 块状马氏体/奥氏体(M/A)岛、条状颗粒不均匀分布于贝氏体铁素体基体上, 平均冲击韧性分别为17和29 J. 710 ℃回火后块状M/A岛分解, 条状颗粒转变为细小的颗粒状呈弥散分布, 冲击韧性达到峰值93 J. 除了基体组织的软化效应外, 第二相的类型、形貌、尺寸和分布能够明显改变诱发裂纹萌生的临界断裂应力, 是影响G18CrMo2-6钢冲击性能的一个关键因素.
Key words： G18CrMo2-6 steel; tempering temperature; Charpy absorbed energy; carbide
Zhenjiang LI , Namin XIAO , Dianzhong LI , Junyong ZHANG , Yongjian LUO , Ruixue ZHANG . INFLUENCE OF MICROSTRUCTURE ON IMPACT TOUGHNESS OF G18CrMo2-6 STEEL DURING TEMPERING[J]. Acta Metall Sin, 2014 , 50(7) : 777 -786 . DOI: 10.3724/SP.J.1037.2013.00747
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