Effect of cold deformation on corrosion fatigue behavior of nickel-free high nitrogen austenitic stainless steel for coronary stent application

doi:10.1016/j.jmst.2017.10.002

Abstract

Abstract:

Due to the excellent mechanical properties, good corrosion resistance, high biocompatibility and nickel-free character, the high nitrogen nickel-free austenitic stainless steel (HNASS) becomes an ideally alternative material for coronary stents. Stent implantation works in harsh blood environment after a balloon dilatation, i.e., the material is used in a corrosive environment with a permanent deformation. The present study attempts to investigate effects of pre-straining on high-cycle fatigue behavior and corrosion fatigue behavior of HNASS in Hank’s solution and the relevant mechanism for coronary stents application. It is found that higher pre-straining on HNASS results in higher strength and maintains almost same corrosion resistance. Fatigue limit of 0% HNASS is 550 MPa, while corrosion fatigue limit is 475 MPa. And improvement in fatigue limit of 20% and 35% pre-strained HNASS is in comparison with the 0% HNASS, while corrosion would undermine the fatigue behavior of HNASS. In a suitable range, the pre-straining had a beneficial effect on corrosion fatigue strength of HNASS, such as nearly 300 MPa improved with 20% cold deformation. This result provides a good reference for predicting the life of HNASS stent and as well its design.

Key words: Cold deformation, High nitrogen austenitic stainless steel, High-cycle fatigue, Corrosion fatigue

Jun Li, Yixun Yang, Yibin Ren, Jiahui Dong, Ke Yang. Effect of cold deformation on corrosion fatigue behavior of nickel-free high nitrogen austenitic stainless steel for coronary stent application[J]. J. Mater. Sci. Technol., 2018, 34(4): 660-665.

Figures/Tables 8

Fig. 1. Configuration of specimen for fatigue test (mm).

Fig. 2. XRD patterns of different pre-strained HNASS specimens.

Fig. 3. OM images of HNASS with different pre-straining: (a) 0%; (b) 20%; (c) 35%.

Fig. 4. S-N curves of different pre-strained specimens in air and Hank’s solution at 37 °C, respectively (The experiment was run for 1 × 107 cycles).

Table 1 Mechanical properties of different pre-strained specimens (MPa).

Sample	Yield strength	Hardness	Ultimate strength	Fatigue limit in air	Fatigue limit in Hank’s sol
0%	647 ± 12	292 ± 7	1012 ± 7	550	475
20%	1108 ± 44	351 ± 9	1209 ± 30	850	750
35%	1488 ± 48	431 ± 16	1506 ± 9	900	750

Fig. 5. SEM images showing fatigue fracture surface morphologies of different pre-deformed HNASS: (a) overall fracture surface (20% deformed specimen under 900 MPa in air); (b) crack initiation site (b1: 0% specimen under 800 MPa in air; b2: 35% deformed specimen under 950 MPa; b3: 35% deformed specimen under 900 MPa in Hank’s solution; b4: 20% deformed specimen under 900 MPa in Hank’s solution); (c) crack propagation site (35% deformed specimen under 950 MPa in Hank’s solution); (d) overload site (0% specimen under 700 MPa in air).

Fig. 6. Anodic cyclic polarization curves of different pre-deformed specimens in Hank’s solution at 37 °C.

Fig. 7. TEM images of HNASS with different pre-straining: (a) 0%; (b) 20%; (c) 35%.

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