Effect of heat-input on pitting corrosion behavior of friction stir welded high nitrogen stainless steel

doi:10.1016/j.jmst.2019.01.011

Abstract

Abstract:

In this study, different welding parameters were selected to investigate the effects of heat-input on the microstructure and corrosion resistance of the friction stir welded high nitrogen stainless steel joints. The results showed that, the welding speed had major influence on the duration at elevated temperature rather than the peak temperature. The hardness distribution and tensile properties of the nugget zones (NZs) for various joints were very similar while the pitting corrosion behavior of various NZs showed major differences. Large heat-input resulted in the ferrite bands being the pitting location, while tool wear bands were sensitive to pitting corrosion in the low heat-input joints. Cr diffusion and tool wear were the main reasons for pitting. The mechanisms of pitting corrosion in the NZs were analyzed in detail.

Key words: High nitrogen stainless steel, Friction stir welding, Mechanical properties, Corrosion resistance, Heat-input

H. Zhang, P. Xue, D. Wang, L.H. Wu, D.R. Ni, B.L. Xiao, Z.Y. Ma. Effect of heat-input on pitting corrosion behavior of friction stir welded high nitrogen stainless steel[J]. J. Mater. Sci. Technol., 2019, 35(7): 1278-1283.

Figures/Tables 10

Table 1 Chemical compositions of BM (wt%).

C	Mn	Cr	Mo	N	Fe
0.04	15.81	18.36	2.19	0.66	Bal.

Fig. 1. Surface morphologies and cross-section hardness profiles of FSW HNS joints with different heat-inputs (RS: retreating side; AS: advancing side).

Fig. 2. Engineering stress-strain curves of BM and NZs of FSW HNS joints with different heat-inputs.

Fig. 3. Pitting morphologies of FSW HNS joints after 48 h of immersion: (a) 500-25; (b) 500-50; (c) 500-150.

Fig. 4. Detailed pitting morphologies and depth profiles of FSW HNS joints: (a) 500-25; (b) 500-50; (c) 500-150.

Fig. 5. EPMA line scan profiles of element distribution near ferrite in FSW HNS joints: (a) 500-25; (b) 500-50; (c) 500-150.

Fig. 6. Comparison between element contents of ferrite in FSW HNS joints.

Fig. 7. STEM image (a) and EDS line scan profiles (b, c) of tool wear debris in 500-150 joint.

Fig. 8. Temperature histories of HAZs in FSW HNS joints.

Fig. 9. Illustration of (a) tool wear and (b) pitting corrosion mechanisms in FSW HNS joints with different heat inputs.

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