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用物理化学电解提取与X射线结构分析方法研究了两种马氏体时效不锈钢(OOCr14Ni16MoNb与OOCr14Ni6MoTi)中第二相的溶析规律。发现前者中的第二相为MC(N_bC)、M_6C(Fe_3Nb_3C)、Z(FeCrN_hNi),后者中的第二相为MC(TiC)、MN(TiN)、X(FeCrNiTi)。实验指出OOCr14Ni6MoN_b钢中M_6C、Z相经1200℃固溶处理后要经770℃以上时效处理才能再行析出,试样的SEM象表明MC主要出现在晶界,M_6C、Z相主要出现在晶内。OOCr14Ni6MoNb钢经长期时效后未发现新相析出。OOCr14Ni6MoTi钢长期时效后有X相析出。
Electrolytic extraction and X-ray structural analysis were used to study the law of the second phase dissolution in two kinds of martensitic stainless steel (OOCr14Ni16MoNb and OOCr14Ni6MoTi). The second phase of the former is found to be MC (N_bC), M_6C (Fe_3Nb_3C), and Z (FeCrN_hNi). The second phase in the latter is MC (TiC), MN (TiN), X (FeCrNiTi). The experiment indicates that the M_6C and Z phases in OOCr14Ni6MoN_b steel can be precipitated again after the solution treatment at 1200 ℃ for more than 770 ℃. The SEM images of the sample show that the MC mainly appears in the grain boundary, while the M_6C and Z phases mainly appear in the crystal . OOCr14Ni6MoNb steel after aging has not found new precipitation. OOCr14Ni6MoTi steel after aging X-phase precipitation.