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Metals 2016, 6(12), 301; doi:10.3390/met6120301

Microstructure, Mechanical and Corrosion Properties of Friction Stir Welding High Nitrogen Martensitic Stainless Steel 30Cr15Mo1N

1
School of Metallurgy, Northeastern University, Shenyang 110819, China
2
Guangdong Welding Institute (China-Ukraine E. O. Paton Institute of Welding), Guangzhou 510650, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 29 October 2016 / Revised: 19 November 2016 / Accepted: 28 November 2016 / Published: 30 November 2016
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Abstract

High nitrogen martensitic stainless steel 30Cr15Mo1N plates were successfully welded by friction stir welding (FSW) at a tool rotation speed of 300 rpm with a welding speed of 100 mm/min, using W-Re tool. The sound joint with no significant nitrogen loss was successfully produced. Microstructure, mechanical and corrosion properties of an FSW joint were investigated. The results suggest that the grain size of the stir zone (SZ) is larger than the base metal (BM) and is much larger the case in SZ-top. Some carbides and nitrides rich in chromium were found in BM while not observed in SZ. The martensitic phase in SZ could transform to austenite phase during the FSW process and the higher peak temperature, the greater degree of transformation. The hardness of SZ is significantly lower than that of the BM. An abrupt change of hardness defined as hard zone (HZ) was found in the thermo-mechanically affected zone (TMAZ) on the advancing side (AS), and the HZ is attributed to a combination result of temperature, deformation, and material flow behavior. The corrosion resistance of SZ is superior to that of BM, which can be attributed to less precipitation and lower angle boundaries (LABs). The corrosion resistance of SZ-bottom is slight higher than that of SZ-top because of the finer grained structure. View Full-Text
Keywords: high nitrogen martensitic stainless steel; friction stir welding; microstructure; hardness; corrosion properties high nitrogen martensitic stainless steel; friction stir welding; microstructure; hardness; corrosion properties
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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).

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MDPI and ACS Style

Geng, X.; Feng, H.; Jiang, Z.; Li, H.; Zhang, B.; Zhang, S.; Wang, Q.; Li, J. Microstructure, Mechanical and Corrosion Properties of Friction Stir Welding High Nitrogen Martensitic Stainless Steel 30Cr15Mo1N. Metals 2016, 6, 301.

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