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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.
The effects of alloying elements on the hardenability and mechanical properties of B steel with B thickness were studied by top quenching, chemical phase analysis and thermodynamic calculation. The results show that due to the much higher bonding strength between Ti and N than B, 0.015%, mass fraction, the same below) can form TiN, fixed N element, make B free and improve hardenability.The conventional Al content (0.02%) is slightly lower than B on the competitiveness of N, can not prevent the precipitation of BN; Al content of 0.07% or more, can improve the adhesion of Al to N, the solid solution B content increases, can also play a role in improving the hardenability by B and nitrogen combination of elements to promote the improvement of hardenability, can make The microstructure of the heart of B-rich steel plate was significantly improved, the amount of granular bainite decreased, the size of martensite / austenite (M / A) island component decreased, the impact toughness and strength at low temperature were significantly increased .