Study on Fatigue Behaviors of 0Cr21Mn17Mo2N0.83 High Nitrogen Stainless Steels

Abstract:

High cycle fatigue behaviors of 0Cr21Mn17Mo2N0.83 high nitrogen stainless steels at forged and solid solution state were investigated. High cycle fatigue tests were carried out up to 10⁷cycles at a stress ratio R=0.1 and frequency of 70Hz on specimens using a high frequency fatigue machine. Fatigue fracture surfaces of specimens that in the high cycle fatigue tests were observed using a scanning electron microscope for revealing the micro-mechanisms of fatigue crack initiation and propagation. The results showed that the fatigue limit of test alloys at room temperature is 865.25 MPa (as-forged alloy) and 736.10MPa (solid solution alloy), respectively. The micro-fatigue fracture surface of the test alloys included three representative regions. These regions are fatigue initiation area, fatigue crack propagation area and fatigue fracture area. Fatigue cracks of the test alloys initiate principally at the precipitates, inclusion or uneven stress concentration sites of alloy surface, and propagate along the grain boundary. The fatigue striations of fatigue crack propagation area are very clear. The fatigue fracture of test specimens show the rupture characteristics of quasi cleavage and dimple fracture. The room temperature fatigue properties of as-forged alloy are generally higher than that of the solid solution high nitrogen stainless steel according to the S-N curves fitting results.

• Periodical: Key Engineering Materials (Volume 861)
• Pages: 89-94
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.861.89
• Online since: September 2020
• Authors: You Yang*, Wei Feng Tang
• Keywords: Fatigue Micro-Mechanism, High Nitrogen Stainless Steel, High-Cycle Fatigue, S-N Curve

References

[1] G. Stein, I. Hucklenbroich, Manufacturing and applications of high nitrogen steels, Materials and Manufacturing Processes, 19 (2004) 7-17.

DOI: 10.1081/amp-120027494

[2] P. Behjati, A. Kerrmanpur, A. Najafizadeh, Influence of nitrogen alloying on properties of Fe-18Cr-12Mn-XN austenitic stainless steels, Materials Science and Engineering: A, 588 (2013) 43-48.

DOI: 10.1016/j.msea.2013.08.053

[3] J. Talonen, T. Taulavuori, H. Hnniner, Effect of temperature on tensile behavior and microstructure evolution of nitrogen alloyed austenitic stainless steel, Int. Conf. on High Nitrogen Steels, 8 (2006) 52-58.

[4] H.J.C. Speidel, M.O. Speidel, Nickel and chromium-based high nitrogen alloys, Materials and Manufacturing Processes, 19 (2004) 95-109.

DOI: 10.1081/amp-120027518

[5] M. Diener, M.O. Speidel, Fatigue and corrosion fatigue of high-nitrogen austenitic stainless steel, Materials and Manufacturing Processes, 1 (2004) 111-115.

DOI: 10.1081/amp-120027519

[6] A. DiSchino, M. Barteri, J.M. Kenny, Fatigue behavior of a high nitrogen austenitic stainless steel as a function of its grain size, Journal of Materials Science Letters, 22 (2003) 1511-1513.

[7] J.B. Vogt, Fatigue properties of high nitrogen steels. Journal of Materials Processing Technology, 3 (2001) 364-369.

[8] S. Degallaix, J. Foct, A. Hendry, Mechanical behaviour of high-nitrogen stainless steels, Materials Science and Technology, 9 (1986) 946-950.

DOI: 10.1179/mst.1986.2.9.946

[9] H.L. Xiang, X.Gu, Research status of nitrogenous stainless steel, Metal World, 1 (2013) 31-36.

[10] N. Maruyama, M. Sanbe, Y. Katada, etal., Fatigue property of nickel-Free high-nitrogen austenitic stainless steels in simulated body fluid, Materials Transactions, 11 (2009) 2615-2622.

DOI: 10.2320/matertrans.m2009216