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

doi:10.11901/1005.3093.2019.157

Chinese Journal of Materials Research

2019, Vol. 33

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

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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

Cite this article:

CHAI Feng,SHI Zhongran,YANG Caifu,WANG Jiaji. Effect of Nitrogen on Microstructure and Mechanical Properties for Simulated CGHAZ of Normalized Vanadium Micro-alloyed Steel. Chinese Journal of Materials Research, 2019, 33(11): 848-856.

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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

Received: 18 March 2019

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	Feng CHAI
	Zhongran SHI
	Caifu YANG
	Jiaji WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.157 OR https://www.cjmr.org/EN/Y2019/V33/I11/848

Table 1 Chemical composition of the tested steel (mass fraction, %)

Fig.1 Impact test result of CGHAZ at different temperature

Fig.2 CGHAZ microstructures of different nitrogen content experimental steels

Fig.3 Orientation distribution of CGHAZ in different nitrogen content experimental steels

Fig.4 Distribution of boundary misorintation angles in different nitrogen content experimental steels (a) 30N steel (b) 82N steel (c) 120N steel (d) 210N steel

Fig.5 EBSD mean effective size of the tolerance angle 15^o

Fig.6 TEM analysis micrographs of precipitations in simulated CGHAZ (a) 30N steel (b) 82N steel (c) 120N steel (d) 210N steel

Table 2 Results of the precipitations quantification

Fig.7 Effect of nitrogen on the particles of steels (a) 30N steel (b) 82N steel (c) 120N steel (d) 210N steel

Fig.8 Beginning temperature of (V, Ti)(C, N) under equilibrium state

Fig.9 OM and SEM micrographs showing impact fracture surface morphologies (a) 30N steel (b) 120N steel

Fig.10 EBSD micrographs showing impact fracture surface morphologies

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