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基于合金设计制备出2种低合金试验热轧板钢,在采用水淬+盐浴回火的淬火-分配-回火(Q-P-T)工艺处理后,达到了屈服强度900MPa和伸长率15%的设计指标,为后期自行设计的单道次穿水淬火冷却装置用于热轧板的Q-P-T工艺工程可行性的研究奠定了基础。X射线衍射、扫描电镜和透射电镜的微观组织分析表明:与传统的淬火回火(Q&T)工艺相比,Q-P-T先进高强度钢中位错型板条马氏体基体及其内弥散分布的合金碳化物贡献于高的强度,板条马氏体间的薄片状奥氏体贡献于优良的塑性。此外,还进一步探讨了Q-P-T工艺中残余奥氏体的作用和多道次穿水淬火冷却装置用于不同厚度热轧板在线Q-P-T处理的可行性。
Based on the alloy design, two kinds of low alloy test hot-rolled steel sheets were prepared. After quenching-distribution-tempering (QPT) treatment with water quenching + salt bath tempering, the yield strength of 900 MPa and the elongation of 15% Which laid the foundation for the feasibility study of the QPT process engineering of hot rolled plate by the single-pass water quenching and cooling device designed by itself in the later period. The microstructure analysis of XRD, SEM and TEM shows that compared with the traditional quenching and tempering (Q & T) process, the dislocation lath martensitic matrix in QPT advanced high strength steel and the alloy dispersed within Carbides contribute to high strength and lamellar austenite between lath martensite contributes to excellent ductility. In addition, the role of retained austenite in Q-P-T process and the feasibility of on-line Q-P-T processing of hot rolled plates with different thicknesses were investigated.