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  

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

作　　者：潘涛[1] 王小勇[1] 苏航[1] 杨才福[1] 

机构地区：[1]钢铁研究总院工程用钢研究所,北京100081

出　　处：《金属学报》2014年第4期431-438,共8页Acta Metallurgica Sinica

基　　金：国家科技支撑计划资助项目2011BAE25B01~~

摘　　要：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.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.

关 键 词：特厚板 淬透性 BN 粒状贝氏体 AlN 热力学计算 

分 类 号：TG142.1[一般工业技术—材料科学与工程]