Mechanism of Improving Low Temperature Impact Toughness of 09MnNi Vessel Steel

doi:10.11901/1005.3093.2021.225

Chinese Journal of Materials Research

2022, Vol. 36

Issue (9): 660-666 DOI: 10.11901/1005.3093.2021.225

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Mechanism of Improving Low Temperature Impact Toughness of 09MnNi Vessel Steel

NING Bo¹, LI Zhichao¹(

), WU Huibin¹, ZHANG Bingjun², HUANG Manli¹, DING Chao¹

^1.Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
^2.Nanjing Iron and Steel Co., Ltd., Nanjing 210035, China

Cite this article:

NING Bo, LI Zhichao, WU Huibin, ZHANG Bingjun, HUANG Manli, DING Chao. Mechanism of Improving Low Temperature Impact Toughness of 09MnNi Vessel Steel. Chinese Journal of Materials Research, 2022, 36(9): 660-666.

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Abstract

The phase transition temperature of Ac1 and Ac3 of 09MnNiDR steel for typical vessel was measured by thermal expansion method, and based on this two new quenching processes were designed. The microstructure, texture and low temperature impact properties of the samples at 1/2 thickness of the plate were investigaed by means of SEM, EBSD and Charpy impact tester. The results show that: Ac1 and Ac3 of 09MnNiDR steel is 692.9℃ and 883.1℃ respectively; compared with the "quasi sub temperature quenching + tempering" or "quasi sub temperature quenching + sub temperature quenching + tempering" heat treatment process, the "pre quenching + quasi sub temperature quenching + tempering" heat treatment could improve the low temperature impact property of the samples at 1/2 thickness of 09MnNiDR steel plate greatly, and one reason of the impact property improvement is grain refinement, another reason is the random distribution of texture.

Key words: metallic materials vessel steel quasi sub temperature quenching impact property texture grain size

Received: 15 April 2021

ZTFLH:

TG156.31

About author: LI Zhichao, Tel: 13520064346, E-mail: lizhichao1225@163.com

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	Bo NING
	Zhichao LI
	Huibin WU
	Bingjun ZHANG
	Manli HUANG
	Chao DING

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.225 OR https://www.cjmr.org/EN/Y2022/V36/I9/660

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

Fig.1 Phase transformation point determination of 09MnNi steel

Table 2 Heat treatment process

Fig.2 Schematic plot of cutting samples

Fig.3 Metallographic image (a) A1; (b) A2; (c) B1; (d) B2

Fig.4 SEM image of impact fracture (a) A1, (b) A2, (c) B1, (d) B2

Fig.5 Orientation image of A1 (a), A2 (b), B1 (c), B2 (d) and the typical texture and distribution of φ2=45° ODF figure in cubic crystal system (e)

Table 3 Statistics of typical texture percentage content (%)

Fig.6 Comparison of texture, texture content variance and impact absorbed energy in samples (a) Texture content of orientation image; (b) Comparison of texture content variance with impact absorbed energy

Fig.7 Grain boundary distribution of samples of A1 (a), A2 (b), B1 (c) and B2 (d)

Fig.8 Statistics of grain size for samples

Fig.9 Proportion of high and low angle boundary

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