论文部分内容阅读
采用QPQ工艺对N含量分别为0.51%和0.72%的固溶态SAF3207特级双相不锈钢进行表面处理。利用OM、SEM、XRD、显微硬度计和摩擦磨损试验机研究了不锈钢的渗层组织及耐磨性。渗层组织观察表明,SAF3207不锈钢经QPQ处理后,渗层由表及里为氧化层(Fe_3O_4)→化合物层(α_N+S+Cr N+ε)→扩散层(α_N+S+Cr N+γ’);与QPQ处理的低N试样相比,高N试样化合物层厚度较低;渗层硬度变化趋势为先升高后平稳然后逐渐降低至基体硬度,其最高硬度达850 HV0.2。干摩擦试验结果表明,SAF3207双相不锈钢经QPQ处理后的磨损性能显著提高,低N试样比高N试样更耐磨。
QPQ process was used to treat the SAF3207 super duplex stainless steel with N content of 0.51% and 0.72%, respectively. The microstructure and wear resistance of stainless steel were studied by OM, SEM, XRD, microhardness tester and friction and wear tester. The microstructure of SAF3207 stainless steel shows that after the QPQ treatment, the diffusion layer is composed of Fe_3O_4 → compound layer (α_N + S + Cr N + ε) → diffusion layer (α_N + S + Cr N + γ) ’). Compared with the low-N sample treated with QPQ, the thickness of the high-N sample compound layer was lower. The hardness of the diffusion layer increased first and then stabilized and then gradually decreased to the hardness of the matrix with a maximum hardness of 850 HV0.2 . The results of dry friction test show that the wear performance of SAF3207 duplex stainless steel after QPQ treatment is significantly improved, while the low N sample is more wear-resistant than the high N sample.