Q-P和S-Q-P工艺在中高碳硅锰钢中的应用

发布时间：2018-05-08 22:25

本文选题：中高碳硅锰钢 + 热处理　；参考：《金属热处理》2015年12期

【摘要】：为探索淬火-分配(Q-P)工艺和分级淬火-分配(S-Q-P)工艺对中高碳钢力学性能的提升作用,对两种中高碳硅锰钢分别进行淬火-回火(Q-T)、Q-P和S-Q-P工艺处理。用拉伸试验机测定抗拉强度和断后伸长率,利用XRD测定残留奥氏体体积分数用SEM分析微观组织。力学性能试验结果显示,与传统的Q-T和当前流行的Q-P工艺相比经S-Q-P处理后钢的综合力学性能显著优化。特别是当含硅量较高时,S-Q-P处理后的中高碳硅锰钢强塑积比Q-T处理后提高3倍以上。微观组织分析表明,S-Q-P处理过程中碳分配过程更加充分,其中的硅元素起到抑制贝氏体竞争反应的作用,因而中高碳硅锰钢经S-Q-P处理后表现出很好的综合力学性能。此外,Q-P工艺对中高碳硅锰钢综合力学性能的改善作用不明显,可能是由于其中发生大量竞争反应,产生贝氏体组织所致。
[Abstract]:In order to explore the promotion of mechanical properties of medium and high carbon steel by quenching-distribution Q-P) process and by step quenching-distribution-S-Q-P process, two kinds of medium and high carbon silicon-manganese steels were treated by quenching-tempering Q-TnQ-Q-P and S-Q-P respectively. Tensile strength and elongation after break were measured by tensile testing machine, and microstructures were analyzed by SEM using XRD to determine the volume fraction of retained austenite. The results of mechanical properties test show that compared with the traditional Q-T and the current Q-P process, the comprehensive mechanical properties of the steel treated with S-Q-P are significantly optimized. Especially when the silicon content is high, the strength plastic product of medium and high carbon silicon-manganese steel after S-Q-P treatment is more than three times higher than that after Q-T treatment. The microstructure analysis shows that the carbon distribution process is more adequate during S-Q-P treatment, and the silicon element plays an important role in inhibiting the bainite competition reaction. Therefore, the medium and high carbon silicon-manganese steel treated by S-Q-P has good comprehensive mechanical properties. In addition, the improvement of comprehensive mechanical properties of medium and high carbon silicon-manganese steel by Q-P process is not obvious, which may be due to a large number of competitive reactions, resulting in bainite structure.
【作者单位】：清华大学材料科学与工程学院;先进成形制造教育部重点实验室;北京电子显微镜中心;
【分类号】：TG142.1;TG161

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