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Acta Metall Sin  2014, Vol. 50 Issue (7): 777-786    DOI: 10.3724/SP.J.1037.2013.00747
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INFLUENCE OF MICROSTRUCTURE ON IMPACT TOUGHNESS OF G18CrMo2-6 STEEL DURING TEMPERING
LI Zhenjiang1, XIAO Namin1,*(), LI Dianzhong1, ZHANG Junyong2, LUO Yongjian2, ZHANG Ruixue2
1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2 KOCEL Group Co., Ltd., Yinchuan 750021
Cite this article: 

LI Zhenjiang, XIAO Namin, LI Dianzhong, ZHANG Junyong, LUO Yongjian, ZHANG Ruixue. INFLUENCE OF MICROSTRUCTURE ON IMPACT TOUGHNESS OF G18CrMo2-6 STEEL DURING TEMPERING. Acta Metall Sin, 2014, 50(7): 777-786.

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Abstract  

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     
Received:  19 November 2013     
ZTFLH:  中图法TG161  
About author:  Correspondent: XIAO Namin, associate professor, Tel: (024)23970106, E-mail: nmxiao@imr.ac.cn
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Zhenjiang LI
Namin XIAO
Dianzhong LI
Junyong ZHANG
Yongjian LUO
Ruixue ZHANG

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00747     OR     https://www.ams.org.cn/EN/Y2014/V50/I7/777

Material C Mn Si P S Cu Cr Mo Ni V
Standard 0.15~0.20 0.5~0.9 0.2~0.6 ≤0.025 ≤0.025 ≤0.5 0.40~0.65 0.45~0.70 0.3~0.5 ≤0.04
Experimental 0.16 0.75 0.45 0.008 0.01 0.01 0.61 0.61 0.46 ≤0.02
表1  标准和实验用G18CrMo2-6钢的化学成分
Fig.1  

G18CrMo2-6钢的2种热处理工艺
Fig.2  

G18CrMo2-6钢在不同冷速正火后的OM和SEM像
Fig.3  

正火冷速对G18CrMo2-6钢基体组织构成及冲击韧性的影响
Fig.4  

G18CrMo2-6钢炉冷正火后的微观组织
Fig.5  

回火温度对G18CrMo2-6钢抗拉强度的影响
Fig.6  

回火温度对G18CrMo2-6钢冲击性能的影响
Fig.7  

不同温度回火后G18CrMo2-6钢在室温下的冲击断口宏观形貌
Fig.8  

回火温度对G18CrMo2-6钢组织硬度的影响
Fig.9  

G18CrMo2-6钢经过正火和不同温度回火后的SEM像
Fig.10  

回火温度对G18CrMo2-6钢中第二相尺寸的影响
Fig.11  

不同温度回火后G18CrMo2-6钢萃取碳化物的XRD谱
Fig.12  

G18CrMo2-6钢回火组织的大块状第二相TEM像及衍射斑点分析
Fig.13  

G18CrMo2-6钢回火组织的TEM像及碳化物衍射斑点分析
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