Evolution of surface roughness of a cast Al-Si-Cu piston alloy during thermal exposure

Abstract

In the present work, samples of Al-Si-Cu piston alloy after T6 heat treatment were exposed for 2 h at temperatures ranging from 400 to 550 °C. The evolution of surface roughness and microstructure of the alloy during thermal exposure was studied by combination methods of roughness profiles, optical and scanning electron microscopy as well as XRD analysis. It is found that the roughness and mass of the alloy increase with the raise of the thermal exposure temperature, and the increasing rates of them are slow as the exposure temperature is below 500 °C, but accelerates abruptly when the temperature is higher than 500 °C. The variation of surface roughness of the alloy is closely related to phase transformation and oxidation during the thermal exposure.

Keywords

surface roughness / thermal exposure / Al-Si-Cu piston alloy / microstructure / oxidation

References

[1] ChenH, HeJ-j, ZhongX-l. Engine combustion and emission fuelled with natural gas: A review [J]. Journal of the Energy Institute, 2019, 92(4): 1123-1136

[2] Karvountzis-KontakiotisA, VafamehrH, CairnsA, PeckhamM. Study on pollutants formation under knocking combustion conditions using an optical single cylinder SI research engine [J]. Energy, 2018, 158: 899-910

[3] ChenX-h, WangZ-y, PanS-q, PanH-k. Improvement of engine performance and emissions by biomass oil filter in diesel engine [J]. Fuel, 2019, 235: 603-609

[4] PombergerS, LeitnerM, StoschkaM. Evaluation of surface roughness parameters and their impact on fatigue strength of Al-Si cast material [J]. Materials Today: Proceedings, 2019, 12: 225-234

[5] MartinV, VazquezJ, NavarroC, DominguezJ. Effect of shot peening residual stresses and surface roughness on fretting fatigue strength of Al 7075-T651 [J]. Tribology International, 2020, 142: 106004

[6] Bar-HenM, EtsionI. Experimental study of the effect of coating thickness and substrate roughness on tool wear during turning [J]. Tribology International, 2017, 110341-347

[7] HuH-h, CaoZ, LiuX-g, FengX-g, ZhengY-g, ZhangK-f, ZhouH. Effects of substrate roughness on the vacuum tribological properties of duplex PEO/bonded-MoS₂ coatings on Ti6Al4V [J]. Surface and Coatings Technology, 2018, 349: 593-601

[8] PeiH-q, WenZ-x, LiZ-w, ZhangY-m, YueZ-f. Influence of surface roughness on the oxidation behavior of a Ni-4.0Cr-5.7Al single crystal superalloy [J]. Applied Surface Science, 2018, 440: 790-803

[9] SerafinD, NowakW J, WierzbaB. The effect of surface preparation on high temperature oxidation of Ni, Cu and Ni-Cu alloy [J]. Applied Surface Science, 2019, 476: 442-451

[10] KumarS, BaeG, LeeC H. Influence of substrate roughness on bonding mechanism in cold spray [J]. Surface and Coatings Technology, 2016, 304: 592-605

[11] XiaoW-w, DengH, ZouS-l, RenY-h, TangD-w, LeiM, XiaoC-f, ZhouX, ChenY. Effect of roughness of substrate and sputtering power on the properties of TiN coatings deposited by magnetron sputtering for ATF [J]. Journal of Nuclear Materials, 2018, 509: 542-549

[12] ChengY Y, LeeC C. Simulation of molecular dynamics associated with surface roughness on an Al thin film [J]. Surface & Coatings Technology, 2008, 203: 918-921

[13] CeschiniL, MorriA, BalducciE, CavinaN, RojoN, CalogeroL, PoggioL. Experimental observations of engine piston damage induced by knocking combustion [J]. Materials & Design, 2017, 114: 312-325

[14] TianL-s, GuoY-c, LiJ-p, WangJ-l, DuanH-b, XiaF, LiangM-x. Elevated re-aging of a piston aluminium alloy and effect on the microstructure and mechanical properties [J]. Materials Science & Engineering A, 2018, 738: 375-379

[15] KonecnR, NicolettoG, KunzL, RivaE. The role of elevated temperature exposure on structural evolution and fatigue strength of eutectic AlSi12 alloys [J]. International Journal of Fatigue, 2016, 83: 24-35

[16] CeschinL, MorriA, MorriA, SabatinoM D. Effect of thermal exposure on the residual hardness and tensile properties of the EN AW-2618A piston alloy [J]. Materials Science & Engineering A, 2015, 639: 288-297