Next Article in Journal
Effects of Solution Treatment on Microstructure and High-Cycle Fatigue Properties of 7075 Aluminum Alloy
Previous Article in Journal
Precipitation Behavior of ωo Phase in Ti-37.5Al-12.5Nb Alloy
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle
Metals 2017, 7(6), 194; doi:10.3390/met7060194

Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution

1
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
2
Shandong Provincial Key Lab of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
3
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
This paper is an extended version of paper published in AIP Conference on the 2017 International Workshop on Advances in Energy Science and Environment Engineering, Hangzhou, Zhejiang, China, 7–9 April 2017.
*
Author to whom correspondence should be addressed.
Academic Editor: Academic Editor Daolun
Received: 17 April 2017 / Revised: 20 May 2017 / Accepted: 21 May 2017 / Published: 26 May 2017
View Full-Text   |   Download PDF [12785 KB, uploaded 27 May 2017]   |  

Abstract

The microstructure evolution and the corrosion behavior of welding heat affected zone (HAZ) of Q315NS steel in 50 wt % H2SO4 at 20 °C was investigated with thermal simulation technique, surface analysis and electrochemical tests. The microstructure of ferrite and pearlite was observed in base metal (BM), fine grained region (FGHAZ) and inter critical region (ICHAZ) while coarse grained region (CGHAZ) consisted of granular bainite. The CGHAZ exhibited the highest microhardness and the largest average grain size. The passivation process occurred on the surface of all specimens. Different microstructure give birth to different corrosion behaviors between CGHAZ and BM, FGHAZ, ICHAZ. The dense oxide film were formed on the surface of ferrite while oxide film with micro voids were formed on the surface of pearlite in BM, FGHAZ and ICHAZ after immersion in 50 wt % H2SO4 solution for 12 h. The rod-shaped corrosion product was formed on the surface of CGHAZ while the porous-structured corrosion product was formed on the surface of BM, FGHAZ and ICHAZ after immersion in 50 wt % H2SO4 solution for 72 h. The corrosion resistance of BM, CGHAZ, FGHAZ and ICHAZ increased during the first 12 h and then declined slowly with increasing immersion time. The BM had the best corrosion resistance while the CGHAZ had the lowest corrosion resistance throughout the corrosion process. View Full-Text
Keywords: Q315NS steel; heat affected zone; sulfuric acid solution; corrosion behavior; electrochemical tests Q315NS steel; heat affected zone; sulfuric acid solution; corrosion behavior; electrochemical tests
Figures

Figure 1a

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Zhang, S.; Zhao, H.; Shu, F.; He, W.; Wang, G. Microstructure and Corrosion Behavior of Simulated Welding HAZ of Q315NS Steel in Sulfuric Acid Solution. Metals 2017, 7, 194.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top