Solution heat treatment of plasma nitrided 15-5PH stainless steel Part I. Improvement of the corrosion resistance

被引：14

作者：

Borges, P. C. ^{[1
]}

Rocha, L. A. ^{[2
,3
]}

机构：

[1] UTFPR, Dept Acad Mecan DAMEC, BR-80230901 Curitiba, Parana, Brazil

[2] CT2M Ctr Mech & Mat Technol, P-4800058 Guimaraes, Portugal

[3] Univ Minho, Dept Engn Mecan, P-4800058 Guimaraes, Portugal

来源：

KOVOVE MATERIALY-METALLIC MATERIALS | 2011年 / 49卷 / 02期

关键词：

solution heat treatment (SHT); plasma nitriding (PN); precipitation-hardening stainless steel; 15-5PH; solution heat treatment of plasma nitrided (SHTPN); corrosion resistance; TEMPERATURE; NITROGEN; BEHAVIOR; MICROSTRUCTURE; IMPLANTATION; TIME;

D O I：

10.4149/km_2011_2_107

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The results of the investigation on Solution Heat Treatment of Plasma Nitrided (SHTPN) precipitation-hardened steel 15-5 PH are presented. The layers have been obtained by the plasma nitriding process followed by solution heat treatment at different temperatures. The influence of the solution heat treatment after nitriding on the dissolution process of the nitrided layer has been considered. The nitrided layers were studied by scanning electron microscopy, X-ray microanalysis (EDX), and X-ray diffraction. Micro-hardness tests of the nitrided layers and solubilized nitrided layers have been carried out and interpreted by considering the processing conditions. It was found that high nitrogen austenitic cases could be obtained after SHTPN of martensitic precipitation-hardened steel (15-5PH). When Solution Heat Treatment (SHT) was performed at 1100 degrees C, some precipitates were observed. The amount of precipitates significantly reduced when the temperature increased. The EDX microanalysis indicated that the precipitate might be chromium niobium nitride. When the precipitation on the austenite phase occurred in small amount, the corrosion resistance increased in SHTPN specimens and the pit nucleation potential also increased. The best corrosion result occurred for SHT at 1200 degrees C.

引用

页码：107 / 117

页数：11

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