EFFECT OF ALLOYING ELEMENT Al ON HARDENABILITITY AND MECHANICAL PROPERTIES OF MICRO-B TREATED ULTRA-HEAVY PLATE STEELS

doi:10.3724/SP.J.1037.2013.00754

Acta Metall Sin

2014, Vol. 50

Issue (4): 431-438 DOI: 10.3724/SP.J.1037.2013.00754

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EFFECT OF ALLOYING ELEMENT Al ON HARDENABILITITY AND MECHANICAL PROPERTIES OF MICRO-B TREATED ULTRA-HEAVY PLATE STEELS

PAN Tao(

), WANG Xiaoyong, SU Hang, YANG Caifu

Division of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081

Cite this article:

PAN Tao, WANG Xiaoyong, SU Hang, YANG Caifu. EFFECT OF ALLOYING ELEMENT Al ON HARDENABILITITY AND MECHANICAL PROPERTIES OF MICRO-B TREATED ULTRA-HEAVY PLATE STEELS. Acta Metall Sin, 2014, 50(4): 431-438.

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Abstract

Utilizing Jominy end quenching test, chemical phase analysis and thermo-dynamical calculation, study of the effect of alloying elements on hardenability and mechanical properties of a B-bearing ultra-heavy plate steel was carried out. The results showed that small amount of Ti addition could form TiN for its much higher bonding ability than B, fixing N element and thus making B free. Normal Al content failed to prevent BN from precipitating due to the weaker competition for N than B. However, when Al content was increased as high as 0.07%, the competition of Al for N was distinctly improved, making solid-solution B increased. For proper chemical combination of B and N-fixing element, hardenability was increased and accordingly both microstructure and mechanical properties were improved so that the quantity and size of martensite/austenite (M/A) islands and granular bainite were decreased markedly, and low-temperature impact toughness and tensile properties were improved by a large degree. The calculation was in a good accord with experimental results.

Key words: ultra-heavy plate hardenability BN granular bainite AlN thermo-dynamical calculation

Received: 21 November 2013

ZTFLH:

TG142.1

Fund: Supported by National Key Technology R&D Program (No.2011BAE25B01)

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	Tao PAN
	Xiaoyong WANG
	Hang SU
	Caifu YANG

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00754 OR https://www.ams.org.cn/EN/Y2014/V50/I4/431

表1 实验钢的化学成分

Fig.1

实验钢的末端淬火淬透性曲线

Fig.2

高冷速条件下2号实验钢的显微组织

Fig.3

1.5 ℃/s冷速条件下实验钢的显微组织

Fig.4

低冷速条件下实验钢TEM像和衍射花样

Fig.5

实验钢的力学性能随淬火冷速的变化

Fig.6

含Ti钢的析出曲线及Ti(C, N)的固N比例

Fig.7

含Ti钢中的TiN析出物形貌和其在冲击载荷作用下的破碎形貌以及能谱图

Fig.8

实验钢中V, Al, B元素与N的竞争关系

Fig.9

不同Al含量对AlN和BN析出的影响

Fig.10

900 ℃时不同N含量下固溶B质量分数与Al含量的关系

Fig.11

含B实验钢的相分析结果

Fig.12

实验钢的屈强比与冷速的关系

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