合金元素Al对微B处理特厚钢板淬透性及力学性能的影响*
潘 涛, 男, 1978年生, 博士
收稿日期: 2013-11-21
修回日期: 2014-01-27
网络出版日期: 2014-04-20
基金资助
*国家科技支撑计划资助项目2011BAE25B01
EFFECT OF ALLOYING ELEMENT Al ON HARDENABILITITY AND MECHANICAL PROPERTIES OF MICRO-B TREATED ULTRA-HEAVY PLATE STEELS
Received date: 2013-11-21
Revised date: 2014-01-27
Online published: 2014-04-20
Supported by
Supported by National Key Technology R&D Program (No.2011BAE25B01)
采用顶端淬火、化学相分析和热力学计算, 研究了合金元素对含B特厚钢板淬透性和力学性能的影响. 结果表明, 由于Ti与N的结合力远高于B, 微量Ti的加入(0.015%, 质量分数, 下同)可形成TiN, 固定N元素, 使B游离, 提高淬透性. 常规Al含量(0.02%)对N的竞争力略低于B, 无法阻止BN的析出; 增加Al含量至0.07%以上, 可提高Al对N的结合力, 固溶B含量增加, 可同样起到提高淬透性的作用. 通过B和固氮元素的组合, 促进淬透性的提高, 可使含B特厚钢板心部的显微组织状态显著改善, 粒状贝氏体数量降低, 马氏体/奥氏体(M/A)岛组分尺寸减小, 低温冲击韧性和强度均有明显提高.
潘涛 , 王小勇 , 苏航 , 杨才福 . 合金元素Al对微B处理特厚钢板淬透性及力学性能的影响*[J]. 金属学报, 2014 , 50(4) : 431 -438 . DOI: 10.3724/SP.J.1037.2013.00754
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
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