Structure and mechanical and corrosion properties of P/M Kh23N18 stainless steel
- 13 Downloads
HVP and HFPB of a prealloyed powder enable high-density Kh23N18 stainless steel to be obtained exhibiting good mechanical and corrosion properties. Such steel, when produced by any of the processes investigated, is superior in strength to cast steel; its elongation and corrosion resistance are comparable to or better than those of cast steel only when additional operations of presintering of blanks and diffusional annealing after hot plastic working are employed. The mechanical and corrosion characteristics of Kh23N18 steel produced by the HVP method from a mixture of iron, chromium, and nickel metal powders are satisfactory, but appreciably poorer than those of the same steel obtained from an alloy powder. Use of a prealloyed powder with a small carbonyl nickel powder addition in the manufacture of Kh23N18 steel by the HFPB method makes it possible markedly to activate the processes taking place during the presintering and short-time heating of porous blanks for HFPB, which manifests itself in an improvement in their strength and ductility characteristics. For the production of P/M Kh23N18 steel and other sintered stainless steels of the austenitic class on an industrial scale the hot-forging method is recommended, since it requires a simpler installation and enables parts of complex configuration to be produced.
KeywordsCorrosion Resistance Cast Steel Plastic Working Corrosion Property Nickel Powder
Unable to display preview. Download preview PDF.
- 1.I. D. Radomysel'skii, S. G. Napara-Volgina, and S. M. Kazimirenko, "Manufacture and some properties of iron-chromium-nickel alloy powders," Poroshk. Metall., No. 11, 7–12 (1972).Google Scholar
- 2.I. D. Radomysel'skii, S. G. Napara-Volgina, L. N. Orlova, and L. M. Apininskaya, "Structure and mechanical and corrosion properties of Kh13 stainless steel powders," Poroshk. Metall., No. 6, 43–48 (1982).Google Scholar
- 3.I. D. Radomysel'skii, S. G. Napara-Volgina, and L. N. Orlova, "Addition of carbonyl powders as a means of improving the compressibility and sinterability of high-alloy steel powders and the properties of materials produced from them," Poroshk. Metall., No. 8, 29–34 (1980).Google Scholar
- 4.F. F. Khimushin, Stainless Steels [in Russian], Metallurgiya, Moscow (1967).Google Scholar
- 5.V. N. Dyatlova, Corrosion Resistance of Metals and Alloys [in Russian], Mashinostroenie, Moscow (1964).Google Scholar