氮对钒微合金钢粗晶热影响区<strong>(CGHAZ)</strong>的组织和性能的影响

doi:10.11901/1005.3093.2019.157

材料研究学报

2019, Vol. 33

Issue (11): 848-856 DOI: 10.11901/1005.3093.2019.157

研究论文

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氮对钒微合金钢粗晶热影响区(CGHAZ)的组织和性能的影响

柴锋¹(

),师仲然¹,杨才福¹,王佳骥²

1. 钢铁研究总院工程用钢研究所北京 100081
2. 海洋装备用金属材料及其应用国家重点实验室鞍山 114009

Effect of Nitrogen on Microstructure and Mechanical Properties for Simulated CGHAZ of Normalized Vanadium Micro-alloyed Steel

CHAI Feng¹(

),SHI Zhongran¹,YANG Caifu¹,WANG Jiaji²

1. Division of Structurale Steels, Central Iron and Steel Research Institute, Beijing 100081, China
2. State Key Laboratory of Metal Material for Marine Equipment and Application，Anshan 114009，China

引用本文:

柴锋,师仲然,杨才福,王佳骥. 氮对钒微合金钢粗晶热影响区(CGHAZ)的组织和性能的影响[J]. 材料研究学报, 2019, 33(11): 848-856.
Feng CHAI, Zhongran SHI, Caifu YANG, Jiaji WANG. Effect of Nitrogen on Microstructure and Mechanical Properties for Simulated CGHAZ of Normalized Vanadium Micro-alloyed Steel[J]. Chinese Journal of Materials Research, 2019, 33(11): 848-856.

全文: PDF(11942 KB) HTML

摘要:

用热模拟方法研究了氮含量对钒微合金钢粗晶热影响区(CGHAZ)的组织和性能的影响。结果表明，氮含量为0.0031%或0.021%时，CGHAZ的韧性较差。氮含量0.0031%时CGHAZ中有少量的Ti(C,N)，晶界铁素体(GBF)较少，晶内有大量尺寸较大的侧板条铁素体(FSP)，解理裂纹沿FSP的直线扩展使其韧性较差。氮含量0.021%时在CGHAZ中生成了较为粗大的(Ti, V)(C, N)和GBF，解理裂纹沿GBF扩展使其韧性较差。氮含量为0.012%时低温韧性较好，在CGHAZ中生成了大量细小的(Ti, V)(C, N)粒子，且GBF尺寸相对较小，晶内有大量的针状铁素体(AF)。这些因素都有利于阻止裂纹扩展，使其低温韧性显著提高。

关键词 ：金属材料, 钒微合金化, 氮含量, 正火型, 粗晶热影响区

Abstract：

The effect of N-content on the microstructure and mechanical properties for the simulated coarse-grain heat-affected zone (CGHAZ) of normalized vanadium micro-alloyed steel was investigated by thermal simulation method. The results show that N-content has significant effect on the low-temperature toughness, precipitates, impact fracture morphology and the ultimate microstructure. The steel containing 0.0031% N or 0.021% N has poor CGHAZ toughness. The steel with 0.012% N has optimal CGHAZ toughness. There is slight Ti-enriched carbonitride and grain boundary ferrite in the steel of 0.0031% N, the large-sized ferrite side-plate in the major microstructure can be as the channel of crack resulting the poor CGHAZ toughness. CGHAZ of 0.021% N contains coarse (Ti, V)CN and coarse grain boundary ferrite, the crack can extend along the coarse grain boundary ferrite resulting in poor toughness. CGHAZ of 0.012% N contains thin (Ti, V)CN, the fine grain boundary ferrite and abundant acicular ferrite, which can act as an obstacle to the crack extension, resulting in preferable CGHAZ toughness.

Key words： metallic materials vanadium microalloying nitrogen content normalized steel simulated CGHAZ

收稿日期: 2019-03-18

ZTFLH:

TG406

作者简介: 柴锋，男，1979年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.157 或 https://www.cjmr.org/CN/Y2019/V33/I11/848

表1 实验用钢的化学成分

图1 焊接粗晶区在不同温度下冲击功的实验结果

图2 不同氮含量实验钢焊接粗晶区的显微组织

图3 不同氮含量试验钢焊接粗晶区的EBSD取向差分布

图4 不同氮含量实验钢焊接粗晶区的EBSD取向差分布

图5 不同氮含量实验钢焊接粗晶区有效晶粒的尺寸

图6 不同氮含量试验钢CGHAZ析出粒子的TEM照片

表2 试验钢模拟CGHAZ析出粒子的定量统计

图 7 不同氮含量实验钢平衡态析出粒子的析出情况

图8 不同氮含量试验钢平衡态(V, Ti)(C, N)析出粒子的析出温度

图9 CGHAZ的冲击断口和二次裂纹OM和SEM形貌

图10 实验钢CGHAZ的冲击断口二次裂纹的EBSD观察

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