Effect of Cr on mechanical properties and corrosion behaviors of Fe-Mn-C-Al-Cr-N TWIP steels

doi:10.1016/j.jmst.2017.08.004

材料科学与技术 ›› 2017, Vol. 33 ›› Issue (12): 1555-1560.DOI: 10.1016/j.jmst.2017.08.004

所属专题： 2017腐蚀与防护专辑

收稿日期:2016-12-17 修回日期:2017-02-09 接受日期:2017-02-19 出版日期:2017-12-20 发布日期:2018-01-30

Effect of Cr on mechanical properties and corrosion behaviors of Fe-Mn-C-Al-Cr-N TWIP steels

Yuan Xiaoyun^a, Zhao Yang^b, Li Xing^a, Chen Liqing^a^*()

^aState Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
^bSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Received:2016-12-17 Revised:2017-02-09 Accepted:2017-02-19 Online:2017-12-20 Published:2018-01-30
Contact: Chen Liqing

摘要/Abstract

Abstract:

By using scanning electron microscopy (SEM) equipped with electron back-scattered diffraction (EBSD) system, transmission electron microscopy (TEM) and CorrTest4 electrochemical workstation, effects of chromium content (1.35wt% - 3.95 wt%) on the mechanical properties and anti-corrosion behaviours of high manganese Fe-Mn-C-Al-Cr-N twinning-induced plasticity (TWIP) steels were studied. The results show that Cr content has an obvious influence on the mechanical properties and fracture behaviors of the high manganese TWIP steels. The yield and ultimate tensile strengths of the steel sheets were improved with increasing Cr content while the elongation was reduced. In addition, with the increase of Cr content, the fracture mode changed from ductile fracture pattern with coarse dimples and tear ridges (Cr content ≤ 2.35%) to intergranular fracture (when Cr content is 3.95%). Furthermore, Cr content has a tremendous effect on anti-corrosion behaviors of the high manganese TWIP steels. The increase of Cr content enhanced the corrosion resistance of the annealed steel sheets by improving the proportion of low-angle boundary.

Key words: High-manganese steel, TWIP steel, Cr content, Mechanical properties, Corrosion resistance

. [J]. 材料科学与技术, 2017, 33(12): 1555-1560.

Yuan Xiaoyun, Zhao Yang, Li Xing, Chen Liqing. Effect of Cr on mechanical properties and corrosion behaviors of Fe-Mn-C-Al-Cr-N TWIP steels[J]. J. Mater. Sci. Technol., 2017, 33(12): 1555-1560.

图/表 11

Table 1 Chemical composition of the high manganese austenitic TWIP steels (in wt%).

No.	C	Mn	Al	Cr	N	Si	P	S	Fe
1	0.32	26.4	2.74	1.13	0.011	0.209	0.0043	0.0019	Bal.
2	0.33	25.9	2.83	2.35	0.013	0.203	0.0042	0.0016	Bal.
3	0.33	25.8	2.83	3.95	0.012	0.197	0.0045	0.0008	Bal.

Fig. 1. Dimension of the tensile test specimen.

Fig. 2. Micrographs obtained from EBSD analyses of the TWIP steel sheets with different Cr contents annealed at 700 °C for 20 min: (a) Cr=1.13%, (b) Cr=2.35%, (c) Cr=3.95%.

Table 2 Correlations of Cr content with grain size and tensile properties of the annealed austenitic TWIP steels.

Cr content (wt%)	Average grain size (μm)	Yield strength (MPa)	Ultimate tensile strength (MPa)	Elongation to failure (%)
1.13	2.1	426.5 ± 10	678.5 ± 5	33.8 ± 0.5
2.35	1.9	453.7 ± 20	690.0 ± 5	33.4 ± 0.3
3.95	1.2	482.3 ± 20	760.0 ± 10	29.8 ± 0.6

Fig. 3. Dependence of grain size on yield and tensile strengths of the high manganese austenitic TWIP steels.

Fig. 4. TEM microstructures of the high manganese austenitic TWIP steel sheets with different Cr contents annealed at 700 °C for 20 min: (a) Cr = 1.13%, (b) Cr = 2.35%, (c) Cr = 3.95%.

Fig. 5. EDX analysis (a) and diffraction pattern (b) of the precipitate in Fig. 4(b).

Fig. 6. SEM micrographs of fracture surface of the high manganese austenitic TWIP steel sheets with different Cr contents annealed at 700 °C for 20 min: (a) Cr = 1.13%, (b) Cr = 2.35%, (c) Cr = 3.95%.

Fig. 7. Anodic polarization curves of the high manganese austenitic TWIP steel sheets with different Cr contents in 3.5% NaCl solution.

Table 3 Characteristic data obtained from polarization curves.

No.	Cr content (wt%)	Annealing temperature (°C)	Time (min)	E_corr (V)	I_corr (A/cm²)
1	1.13	700	20	-0.72 ± 0.03	6.76 × 10^-5 ± 6 × 10^-7
2	2.35	700	20	-0.68 ± 0.05	1.35 × 10^-5 ± 5 × 10^-7
3	3.95	700	20	-0.60 ± 0.03	8.51 × 10^-6 ± 3 × 10^-8

Fig. 8. Misorientation distribution of the high manganese austenitic TWIP steel sheets with different Cr contents.

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Effect of Cr on mechanical properties and corrosion behaviors of Fe-Mn-C-Al-Cr-N TWIP steels

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