Q235碳鋼實驗室固體變形滲碳技術


摘    要
　　　本課題名稱為Q235碳鋼實驗室固體變形滲碳技術，主要是通過實驗的手段并結合一些數(shù)學方法對Q235碳鋼經(jīng)拉伸變形后的固體滲碳工藝進行深入研究，將材料變形和化學熱處理相結合，探索變形低碳鋼件固體滲碳工藝的相關技術及低碳鋼經(jīng)變形滲碳后主要性能的變化。通過大量實驗并結合數(shù)學理論的計算，最終得出了Q235碳鋼在不同拉伸變形條件和滲碳時間下的滲碳層深度、硬度及滲碳件沖擊韌性的實驗數(shù)據(jù)。
　　　通過實驗和計算得出的數(shù)據(jù)，得到滲碳層深度與滲碳保溫時間關系、滲碳層深度與拉伸變形率關系、沖擊韌性與保溫時間關系，反映了Q235碳鋼滲碳件主要性能與滲碳溫度和拉伸變形率的關系。
　　　通過在實驗中控制拉伸變形率和滲碳溫度而得到的一系列關系，定性的分析研究了滲碳溫度對滲碳件硬度的影響；滲碳件硬度沿滲碳層的變化情況；滲碳件的沖擊韌性等。這些研究得出的結果，更深刻地了解了低碳鋼滲碳技術，認識了對滲碳主要工藝參數(shù)的控制，并借鑒前人的成果，得到滲碳保溫時間越長，滲碳層越深，滲碳件表面硬度越高，故而滲碳效果越好。但另一方面，滲碳溫度越高越長，表面脆性增強，韌性降低，即試件抗沖擊性能降低。滲碳后緩冷，將得到珠光體類型的組織，由表面向內(nèi)依次為過共析區(qū)（珠光體+網(wǎng)狀滲碳體）、共析區(qū)（珠光體）、亞共析區(qū)（珠光體+鐵素體,且鐵素體的量由外向內(nèi)不斷增加），直至原始組織。
    Q235碳鋼經(jīng)拉伸變形后的固體滲碳工藝進行深入研究，將材料變形和化學熱處理相結合，探索變形低碳鋼件固體滲碳工藝的相關技術及低碳鋼經(jīng)變形滲碳后主要性能的變化。   

關鍵詞:  Q235碳鋼；固體滲碳；變形滲碳；滲碳溫度；滲碳層深度

The solid deformation carburizing process of Q235 carbon steel in laboratory

Abstract
　　The name of the topic deformation of Q235 carbon steel solid carburizing technology laboratory. Mainly by means of experiments and mathematical methods combined with some of tensile deformation on Q235 steel by carburizing process after the solid-depth study of the material deformation and the combination of chemical treatment, to explore low carbon steel deformed carburizing technology related to solid Skilled and low-carbon steel after carburizing by the deformation of the major performance changes. By combining a large number of experiments and mathematical theory of computation, eventually obtained the tensile deformation of Q235 carbon steel in different conditions and under the carburizing carburizing time depth, hardness and impact toughness of carburized pieces of experimental data.
　　Experimental and calculated data, the depth of carburized layer holding time carburizing, carburizing depth relationship with the tensile strain rate, impact toughness and holding time, reflecting the Q235 carbon steel with carburized main performance parts Carburizing temperature and the relationship between the rate of tensile deformation.
　　Controlled by tensile deformation rate of the experiment and obtained a series of carburizing temperature relationship, qualitative analysis of the carburizing temperature on the hardness of carburized parts; carburized carburized layer hardness along parts of the changes; carburizing Parts of the impact toughness.The results of these studies, a deeper understanding of the low carbon carburizing technology, understanding the main process parameters on the control of carburization, and learn from previous studies, the longer the holding time by carburizing, carburizing layer deeper , the higher the surface hardness of carburized parts, and therefore the better cementite. On the other hand, the longer the holding time carburizing, surface brittleness increased, the toughness decreases, that is, the specimen impact performance. Slow cooling after carburizing, will be pearlite type of organization, followed by the inner surface area than eutectoid (pearlite + network cementite), eutectoid zone (pearlite), hypoeutectoid District (pearlite Ferrite and ferrite increasing the amount of outside to inside) until the original organization.
　　Q235 carbon steel after deformation by tension-depth study of the solid carburizing process, the material deformation and the combination of chemical treatment, to explore low carbon steel deformed solid carburizing process related technologies and low carbon steel after carburizing by the deformation of the main performance Changes.

Keywords: Q235 carbon steel; Solid carburizing; Deformation of cementite; Carburizing temperature carburized layer depth
目錄

摘    要 I
Abstract II
插圖清單 IV
表格清單 V
引 言 - 1 -
第1章   緒 論 - 2 -
1.1 熱處理概述 - 2 -
1.2 我國滲碳技術的發(fā)展 - 2 -
1.3本課題主要研究內(nèi)容與選題意義 - 3 -
第2章   低碳鋼固體預變形滲碳技術 - 4 -
2.1  滲碳 - 4 -
2.2 鋼的形變熱處理 - 10 -
2.3 Q235碳鋼性能 - 11 -
第3章   實驗過程與結果 - 12 -
3.1拉伸變形 - 12 -
3.2 滲碳 - 14 -
3.3 滲碳件的性能測試 - 17 -
第4章   實驗結果與分析 - 23 -
4.1 滲碳層深度數(shù)據(jù)分析 - 23 -
4.2 沖擊試驗數(shù)據(jù)分析 - 25 -
4.3 金相圖片分析 - 26 -
結論與展望 - 27 -
致  謝 - 28 -
參考文獻 - 29 -
附錄A 外文文獻及翻譯 - 30 -
附錄B 文獻摘要 - 43 -