耐熱鋼の研究 (XIII) : X-線廻折その他による 16-25-6 合金の析出物の解析

概要

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The precipitated particles were determined by means of X-ray diffraction, electronic microscope, chemical analysis, and selective etching for both of regular 16-25-6 alloy and 16-25-6 alloy containing Ti. Samples for X-ray diffraction test and for an electronic microscope were extracted from aged specimens by electrolytic decomposition in 3% HCl solution. For X-ray diffraction test, there were two methods. One applied the usual X-ray diffraction tester using photograph film, and another used a tester which measured the diffraction and intensity automatically with Geiger counters. The author's data were compared with the known carabides crystallographic data (from ASM Diffaction Data Cards.) It was concluded that precipitated particles in Timken 16-25-6 alloy contained two kinds of carbides, M_6C, (Fe, Cr)_<23>C_6, at least. These particles were also analysized chemically, and evidence of the presence of nitride was found simultaneously. Presence of σ phase was not found. On the other hand, the carbide M_6C was observed through microscope by using selective etching reagent. Thus, with the regular 16-25-6 alloy, it was concluded that precipitated particles perhaps were M_6C, (Fe, Cr)_<23> C_6, and Cr MoN_2. In the case of 16-25-6 alloy contaning Ti, the intermetallic compound M_2Ti (perhaps Ni_2Ti) were observed apparently, besides carbides M_6C and M_<23>C_6.
社団法人日本鉄鋼協会の論文
1957-12-01