Effect of N addition on tensile and corrosion behaviors of CD4MCU cast duplex stainless steels |
| |
| Authors: | Jinil Son Sangshik Kim Jehyun Lee Byunghak Choi |
| |
| Affiliation: | (1) the Division of Materials Science and Engineering, Engineering Research Center, Gyeongsang National University, 660-701 Chinju, Korea;(2) the Department of Metallurgical Engineering, Changwon National University, 641-773 Changwon, Korea;(3) the Department of Metallurgical Engineering, Kangnung National University, 210-702 Kangnung, Korea |
| |
| Abstract: | The effect of N addition on the microstructure, tensile, and corrosion behaviors of CD4MCU (Fe-25Cr-5Ni-2.8Cu-2Mo) cast duplex
stainless steel was examined in the present study. The slow strain rate tests were also conducted at a nominal strain rate
of 1 × 10−6/s in air and 3.5 pct NaCl+5 pct H2SO4 solution for studying the stress corrosion cracking (SCC) behavior. It was observed that the volume fraction of austenitic
phase in CD4MCU alloy varied from 38 to 59 pct with increasing nitrogen content from 0 to 0.27 wt. pct. The tensile behavior
of CD4MCU cast duplex stainless steels, which tended to vary significantly with different N contents, appeared to be strongly
related to the volume changes in ferritic and austenitic phases, rather than the intrinsic N effect. The improvement in the
resistance to general corrosion in 3.5 pct NaCl+5 pct H2SO4 aqueous solution was notable with 0.13 pct N addition. The further improvement was not significant with further N addition.
The resistance to SCC of CD4MCU cast duplex stainless steels in 3.5 pct NaCl+5 pct H2SO4 aqueous solution, however, increased continuously with increasing N content. The enhancement in the SCC resistance was believed
to be related to the volume fraction of globular austenitic colonies, which tended to act as barriers for the development
of initial pitting cracks in the ferritic phase into the sharp ones. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
