Microstructural modification during isothermal ageing of a low nickel duplex stainless steel

被引：14

作者：

Calliari, I. ^{[1
]}

Brunelli, K. ^{[1
]}

Zanellato, M. ^{[1
]}

Ramous, E. ^{[1
]}

Bertelli, R. ^{[2
]}

机构：

[1] Univ Padua, DPCI, I-35131 Padua, Italy

[2] Acciaierie Valbruna SpA, Vicenza, Italy

来源：

JOURNAL OF MATERIALS SCIENCE | 2009年 / 44卷 / 14期

关键词：

CR-MN; SYSTEM;

D O I：

10.1007/s10853-009-3505-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to reduce the cost of duplex stainless steel (DSS), the Ni could be partially substituted by Mn and N, to maintain the alpha/gamma microstructure, the corrosion resistance and mechanical strength similar to the common Ni-Cr-Mo DSS. In this paper the microstructure stability, impact strength and the general corrosion behaviour of a low Ni grade, 22Cr-4Mn-0,2N DSS, were examined. In the solution annealing condition the corrosion resistance is quite similar to the austenitic grade. A moderate precipitation of nitrides and carbides was evidenced after isothermal treatment in the range 600-900 A degrees C, while no dangerous topologically close packed phases (TCP-phases) were detected. The precipitation affects the impact strength, which decreases to about 50 J, while the corrosion resistance is less markedly affected.

引用

页码：3764 / 3769

页数：6

共 14 条

[1] Corrosion behaviour of some stainless steels in chlorinated Gulf seawater [J].