Precipitation condition and effect of volume fraction on corrosion properties of secondary phase on casted super-duplex stainless steel UNS S32750

被引：16

作者：

Shin, Byung-Hyun ^{[1
]}

Kim, Dohyung ^{[1
]}

Park, Sanghyup ^{[1
]}

Hwang, Myungwon ^{[1
]}

Park, Junghyun ^{[1
]}

Chung, Wonsub ^{[1
]}

机构：

[1] Pusan Natl Univ, Dept Mat Sci & Engn, Busan, South Korea

来源：

ANTI-CORROSION METHODS AND MATERIALS | 2019年 / 66卷 / 01期

关键词：

Volume fraction; Corrosion behavior; Precipitation condition; Secondary phase; Super-duplex stainless steel; PITTING CORROSION; RESISTANCE; TOUGHNESS; MICROSTRUCTURE; BEHAVIOR;

D O I：

10.1108/ACMM-06-2018-1958

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Purpose The secondary phase decreased the corrosion resistance because of the segregation of Cr and Mo. Therefore, this paper aims to study the precipitation condition and the effect of secondary phase with volume fraction on corrosion behavior. Design/methodology/approach Secondary phase precipitated approximately from 375 degrees C to 975 degrees C because of saturated Cr and Mo at grain boundary by growth of austenite. Therefore, heat treatment from 800 degrees C to 1,300 degrees C was applied to start the precipitation of the secondary phase. Findings The secondary phase is precipitated at 1,020 degrees C because of segregation by heterogeneous austenite. The growth of austenite at 1,000 degrees C needs the time to saturate the Cr and Mo at grain boundary. When the volume fraction of austenite is 56 per cent (14 min at 1,000 degrees C), the secondary phase is precipitated with grain boundary of austenite. The secondary phase increased the current density (corrosion rate) and decreased the passivation. That is checked to the critical pitting temperature (CPT) curves. The 1 per cent volume fraction of secondary phase decreased CPT to 60 degrees C from 71 degrees C.

引用

页码：61 / 66

页数：6

共 23 条

[1] Microstructural evolution and localized corrosion resistance of an aged superduplex stainless steel [J].