Nb对V、N微合金化压力容器钢珠光体形态及低温韧性影响

doi:10.13228/j.boyuan.issn1006-9356.20220593

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Abstract The effect of Nb on microstructure and mechanical properties for V, N microalloyed normalizing pressure vessel steel was studied by substituting niobium (Nb) for part of vanadium (V) to improve the low temperature toughness while ensuring the strength. The results show that the low temperature impact toughness of Nb+V test steel increases significantly compared with V steel when the strength maintains 630 MPa. The low temperature impact energy of -20, -40, -60 ℃ increases by 59, 44, 29 J respectively, because the addition of Nb promotes the transformation of fine ferrite and enhances plasticity and toughness of steel. In addition, the diffusion coefficients of carbon atoms in V and Nb+V test steel are 2.64×10^-13, 2.14×10^-13 cm²/s at the average transformation temperature. Nb refines the pearlite clusters and lamellar spacing by reducing the growth rate of pearlite and increasing the undercooling degree during the transformation process. EBSD results show that the effective grain size decreases from 7.7 μm to 5.8 μm and the percentage of high angle grain boundary increases from 83.1% to 85.5% after Nb replacing part of V. The fine grain effect of Nb and its contribution to the increase of large angle grain boundary ratio can greatly improve the low temperature impact toughness.

Key words： pressure vessel steel Nb, V microalloying microstructure low temperature toughness grain size

Received: 08 July 2022

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	Articles by authors
	CHEN Teng-sheng
	ZHANG Li-qin
	LIU Zhong-zhu
	LIU Wen-bin
	LI Fang-zhong
	HU Feng

Cite this article:

CHEN Teng-sheng,ZHANG Li-qin,LIU Zhong-zhu等. Effect of Nb on pearlite morphology and low temperature toughness of V, N microalloyed pressure vessel steel[J]. China Metallurgy, 2023, 33(1): 72-80.

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http://www.zgyj.ac.cn/EN/10.13228/j.boyuan.issn1006-9356.20220593 OR http://www.zgyj.ac.cn/EN/Y2023/V33/I1/72

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