Influence of Nitrocarburizing and Post-Oxidation on Surface Characteristics, Fatigue, and Corrosion Fatigue Behaviour of
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ORIGINAL ARTICLE
Influence of Nitrocarburizing and Post-Oxidation on Surface Characteristics, Fatigue, and Corrosion Fatigue Behaviour of AISI 4330V Steel Vaibhav Bhavsar1 • Amol Gujar1 • Niketan Manthani1 • Nagaraj Patil1 Vinayak Pawar1 • M. K. Mishra2 • Rajkumar Singh1
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Received: 30 May 2020 / Accepted: 26 July 2020 The Indian Institute of Metals - IIM 2020
Abstract In the present work, gaseous nitrocarburizing followed by water spray oxidation in vacuum was carried out on 4330V steel. The X-ray diffraction analysis showed that the thermochemically modified surface layer mainly consisted of e-Fe2-3(N,C), c0 -Fe4(N,C), and magnetite (Fe3O4). To quantify the residual stress generated due to surface treatment, the Sin2w method was used. Residual stress of compressive nature up to a depth of 1 mm was observed, and its maximum value was 383 MPa. Nitrocarburizing followed by oxidation not only increased the surface hardness but also decreased the wear loss. The synergistic effect of corrosion-resistant phases formed after surface treatment improved surface hardness and compressive residual stress which resulted in the enhancement of corrosion fatigue life. Keywords Nitrocarburizing Oxidation Slurry erosion Corrosion fatigue Fluid end
1 Introduction AISI 4330V is an important type of steel which is widely used in the oil and gas industries [1]. It possesses good fracture toughness which is useful for such applications where the product is under cyclic loading condition. The
& Vaibhav Bhavsar [email protected] 1
Kalyani Centre for Technology and Innovation, Bharat Forge Limited, Pune 411036, India
2
Department of Metallurgical and Materials Engineering, Malaviya National Institute of Technology Jaipur, Jaipur 302017, India
typical component of 4330V used in oil industries viz. fluid end is shown in Fig. 1. Generally, fluid end experiences failure due to the interaction of a harsh working environment and mechanical cause such as fatigue and wear, and thereby pumping life is short [2]. In order to achieve a better life, researchers attempted some alternative materials. Precipitation hardening (PH) stainless steel can be used instead of low alloy steel to achieve better performance. However, by keeping cost in mind, improving the life of low alloy steel by a suitable surface treatment might be a good alternative approach which motivates the present work. Several works on different materials show that a suitable surface treatment/combination of different surface treatments can enhance fatigue [3, 4], tribological [5–8], and corrosion properties [9–12]. A significant change in the passivation behaviour of steel after nitriding, nitocarburizing, and boronizing along with post-oxidation treatment was presented by H-J Spies [13]. It is well known that chemical composition such as concentration of nitrogen or carbon and structure of white compound layer determines the corrosion resistance of nitrocarburized surface [14]. Dong-Cherng Wen [15] conducted nitrocarburizing of DC53 tool steel and obse
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