本文選題：中高碳硅錳鋼 + 熱處理��； 參考：《金屬熱處理》2015年12期

【摘要】：為探索淬火-分配(Q-P)工藝和分級淬火-分配(S-Q-P)工藝對中高碳鋼力學(xué)性能的提升作用,對兩種中高碳硅錳鋼分別進行淬火-回火(Q-T)、Q-P和S-Q-P工藝處理。用拉伸試驗機測定抗拉強度和斷后伸長率,利用XRD測定殘留奧氏體體積分數(shù)用SEM分析微觀組織。力學(xué)性能試驗結(jié)果顯示,與傳統(tǒng)的Q-T和當(dāng)前流行的Q-P工藝相比經(jīng)S-Q-P處理后鋼的綜合力學(xué)性能顯著優(yōu)化。特別是當(dāng)含硅量較高時,S-Q-P處理后的中高碳硅錳鋼強塑積比Q-T處理后提高3倍以上。微觀組織分析表明,S-Q-P處理過程中碳分配過程更加充分,其中的硅元素起到抑制貝氏體競爭反應(yīng)的作用,因而中高碳硅錳鋼經(jīng)S-Q-P處理后表現(xiàn)出很好的綜合力學(xué)性能。此外,Q-P工藝對中高碳硅錳鋼綜合力學(xué)性能的改善作用不明顯,可能是由于其中發(fā)生大量競爭反應(yīng),產(chǎn)生貝氏體組織所致。
[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.
【作者單位】： 清華大學(xué)材料科學(xué)與工程學(xué)院;先進成形制造教育部重點實驗室;北京電子顯微鏡中心;
【分類號】：TG142.1;TG161

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本文編號：1863354