【摘要】 采用正交实验法研究了 15Cr 7 5Mn 2 6Mo双相不锈钢的固溶渗氮工艺。结果表明 :在压力0 15MPa的高纯N2 气氛中 ,10 5 0℃× 2h +115 0℃× 3h +10 5 0℃× 2h +115 0℃× 4h工艺为最佳工艺 ,按此工艺 ,可获得 1 6 2mm以高氮奥氏体为主的表层。方差分析表明 :渗剂种类对固溶渗氮影响特别显著 ,炉内压力与工艺的影响显著。X射线衍射分析证实固溶渗氮后缓冷试样表层主要物相为 :氮奥氏体、CrN、Fe3O4 和少量氮铁素体 ;固溶渗氮 +固溶处理试样表层为单相氮奥氏体。这说明固溶渗氮是氮在奥氏体的纯扩散过程 ,测得PN2 =0 15MPa、10 5 0～ 12 0 0℃条件下的氮的扩散激活能Q =186 6kJ mol更多还原

【Abstract】 Solid solution nitriding of 15Cr-7.5Mn-2.6Mo duplex stainless steel was investigated by means of orthogonal tests. The results show that the best technology would be using pure N 2 with P N 2=0.15MPa under the conditions of 1050℃×2h+1150℃×3h+1050℃×2h+1150℃×4h. The high nitrogen austenitic case with the depth of 1.62mm can be obtained. Orthogonal tests show that the type of nitriging medium has the most notable effect on solid solution nitriding and the pressure in the furnace and the technology also has a notable effect. X-ray diffraction analysis results indicate that the main phases in the cases of the solution-nitrided samples cooled in the furnace are high nitrogen austenite, CrN, Fe\-3O\-4 and nitrogen ferrite. In the other samples experienced solid solution nitriding and solution treatment the phase in the cases is only high nitrogen austenite. The results show that solid solution nitriding is a process that nitrogen purely diffuses in the austenite. The diffusing activation energy in the conditions of P N 2=0.15MPa and 1050℃～1200℃ is 186.6kJ/mol.更多还原