發(fā)布時(shí)間：2019-05-18 01:21

【摘要】：以42CrMo鋼為材料,對(duì)比研究了傳統(tǒng)和直流電場(chǎng)催滲鹽浴滲氮技術(shù)。利用光學(xué)顯微鏡、顯微硬度計(jì)和X射線衍射儀對(duì)滲層的顯微組織、滲層厚度、硬度及物相進(jìn)行了測(cè)試和分析。研究結(jié)果表明:直流電場(chǎng)可以顯著提高鹽浴滲氮速度,降低滲氮溫度或縮短滲氮時(shí)間;在外加電壓7.5 V直流電場(chǎng)條件下,保溫時(shí)間為80 min時(shí),處理溫度530℃獲得的化合物層厚度與同樣時(shí)間常規(guī)鹽浴滲氮560℃時(shí)獲得的層深相近,約為6.7μm,處理溫度為560℃時(shí)化合物層厚度提高到12.1μm。雖然直流電場(chǎng)不改變42CrMo鋼鹽浴滲氮層的主要物相,均由ε-Fe_3N相、γ'-Fe_4N相和Cr N相構(gòu)成,但直流電場(chǎng)鹽浴滲氮后滲層中硬度較高的γ'-Fe_4N相的相對(duì)含量更高。因此,直流電場(chǎng)鹽浴滲氮處理后的42CrMo鋼的截面顯微硬度大幅度的提高,經(jīng)過575℃×80 min,7.5 V鹽浴滲氮后的試樣截面顯微硬度達(dá)到1100 HV0.01,是基體硬度的3倍。同時(shí),施加電場(chǎng)鹽浴滲氮使42CrMo鋼耐蝕性比常規(guī)鹽浴滲氮進(jìn)一步提高。
[Abstract]:Using 42CrMo steel as material, the traditional and DC electric field catalytic salt bath nitriding technology was compared and studied. The microstructure, thickness, hardness and phase of the infiltrated layer were measured and analyzed by optical microscope, microhardness tester and X-ray diffractometer. The results show that DC electric field can significantly increase the nitriding speed of salt bath, reduce the nitriding temperature or shorten the nitriding time. Under the condition of applied voltage 7.5V DC electric field and holding time of 80 min, the thickness of compound layer obtained at 530C is similar to that obtained at 560C in conventional salt bath nitriding at the same time, which is about 6.7 渭 m. When the treatment temperature is 560 鈩，

本文編號(hào)：2479554