Microstructure Evolution and Failure Behavior of Stellite 6 Coating on Steel after Long-Time Service
Source abstract
Abstract
The microstructure evolution, elements diffusion and fracture behavior of the Stellite 6 weld overlay, deposited on 10Cr9Mo1VNbN (F91) steel by the tungsten inert gas (TIG) cladding process, were investigated after long-time service. Obvious diffusion of Fe occurred from the steel and fusion zone to the Stellite overlay, resulting in the microstructure evolution and hardness increase in the coating, where hard Co–Fe phases, σ phases (Fe–Cr metallic compounds) and Cr-rich carbides (Cr18.93Fe4.07C6) were formed. Besides, the width of the light zone, combined with the fusion zone and diffusion zone, increased significantly to a maximum value of 2.5 mm. The fracture of the Stellite coating samples mainly occurred in the light zone, which was caused by the formation and growth of circumferential crack and radial crack under high temperature and pressure conditions. Moreover, the micro-hardness values in the light zone increased to the maximum (470–680 HV) due to the formation and growth of brittle Co–Fe phases. The formation of these cracks might be caused by formed brittle phases and changes of micro-hardness during service.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: High-Temperature Coating Behaviors · High Entropy Alloys Studies · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
State Key Laboratory of Long-life High Temperature Materials, Dongfang Turbine Co., Ltd., Deyang 618000, China
Manufacturing Technology Department, Dongfang Turbine Co., Ltd., Deyang 618000, China
References (22)
Show source-provided references
1. Microstructure evolution and corrosion behaviour of an ASTM A213 T91 tube after long term creep exposure10.1016/j.engfailanal.2017.03.023 ↗
2. Effects of yttrium on microstructure, mechanical properties andhigh-temperature wear behavior of cast Stellite 6 alloy10.1016/S0043-1648(03)00057-7 ↗
3. Sliding wear of cobalt-based alloys used in rolling seamless tubes10.1016/j.wear.2017.01.009 ↗
4. Stellite alloy mixture hardfacing via laser cladding for control valve seat sealing surfaces10.1016/j.surfcoat.2017.09.018 ↗
5. Characteristics and bonding behavior of Stellite 6 alloy coating processed with supersonic laser deposition10.1016/j.jallcom.2015.11.077 ↗
6. Influence of laser irradiation on deposition characteristics of cold sprayed Stellite-6 coatings10.1016/j.optlastec.2017.09.034 ↗
7. Li, Y., Zhang, P., Bai, P., Su, K., and Su, H. (2019). TiBCN-ceramic-reinforced Ti-based coating by laser cladding: Analysis of processing conditions and coating properties. Coatings, 9.10.3390/coatings9060407 ↗
8. Tian, L., Feng, Z., and Xiong, W. (2018). Microstructure, micro-hardness, and wear resistance of AlCoCrFeNiTi/Ni60 coating by plasma spraying. Coatings, 8.10.3390/coatings8030112 ↗
9. Investigations on wear characteristics of Stellite coating by micro-plasma transferred arc powder deposition process10.1016/j.wear.2017.02.041 ↗
10. Microstructure and sliding wear properties of HVOF sprayed, laser remelted and laser clad Stellite 6 coatings10.1016/j.surfcoat.2016.09.012 ↗
11. Properties of HVOF-sprayed Stellite-6 coatings10.1016/j.surfcoat.2018.01.078 ↗
12. Comparison of Hot Wire TIG Stellite 6 weld cladding and lost wax cast Stellite 6 under corrosive wear conditions10.1016/j.wear.2018.03.004 ↗
13. Li, Z., Cui, Y., Wang, J., Liu, C., Wang, J., Xu, T., Lu, T., Zhang, H., Lu, J., and Ma, S. (2019). Characterization of microstructure and mechanical properties of Stellite 6 part fabricated by wire arc additive manufacturing. Metals, 9.10.3390/met9040474 ↗
14. Fang, L., Yan, H., Yao, Y., Zhang, P., Gao, Q., and Qin, Y. (2018). Reactive fabrication and effect of NbC on microstructure and tribological properties of CrS Co-based self-lubricating coatings by laser cladding. Materials, 11.10.3390/ma11010044 ↗
15. Effect of two different energy inputs for laser cladding of Stellite 6 on P91 and P22 steel substrates10.1016/j.mspro.2014.07.005 ↗
16. Study of stellite-6 deposition by cold gas spraying10.1016/j.surfcoat.2013.06.120 ↗
17. Plasma transferred arc welding of Stellite 6 alloy on stainless steel for wear resistance10.1016/j.protcy.2016.08.226 ↗
18. Effect of interlayers on the microstructure and wear resistance of Stellite 6 coatings deposited on AISI 420 stainless steel by GTAW technique10.1016/j.surfin.2017.08.005 ↗
19. A study of the solid–liquid interface in cobalt base alloy (Stellite) coatings deposited by fusion welding (TIG)10.1016/j.matchar.2006.01.016 ↗
20. Microstructural features and mechanical properties of a cobalt-based laser coating10.1016/S1359-6454(96)00250-9 ↗
21. Fe-rich border and activation energy of phase decomposition in a Fe–Cr alloy10.1016/j.matchemphys.2013.05.023 ↗
22. Theoretical study of magnetic properties and hyperfine interactions in σ-FeValloys10.1016/j.intermet.2011.10.015 ↗