Microstructural evolution in the cross section of Ni-based superalloy induced by high power laser shock processing

Cao, Jun; Cao, Xueyu; Jiang, Bochen; Yuan, Fang; Yao, D.P.; Huang, Jian Yun

doi:10.1016/j.optlastec.2021.107127

Cited by 8 publications

(1 citation statement)

References 37 publications

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“…The interaction of hot corrosion and fatigue is caused by elevated temperatures, mechanical loading, combustion gases and airborne contaminants [9,10]. Other studies investigated the surface and sub-surface properties post laser peening [11][12][13][14][15][16][17]. The results of the previous studies aforementioned were done with laser energies in the sub-joule range meaning that a small spot size has to be used to achieve the desired irradiance.…”

Section: Introductionmentioning

confidence: 99%

Effects of high energy laser peening followed by pre-hot corrosion on stress relaxation, microhardness and fatigue life and strength of single crystal nickel CMSX-4® superalloy

Morar

Holtham

Hackel

et al. 2023

Preprint

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This study investigated the stress relaxation and fatigue life and strength of laser peened single crystal nickel superalloy specimens compared to un-peened and shot peened specimens following hot corrosion exposure and then fatigue testing. The specimens were treated by conventional laser peening and a new cyclic laser peening plus thermal microstructure engineering process. The latter treatment supports the benefit of a unique process involving application of layers of laser peening using high energy with large footprint spots combined with interspersed cyclic annealing. Stress measurements by slitting showed the plastic penetration depth of laser peening exceeded shot peening by a factor of 24. Un-peened and peened specimens were exposed to sulphate corrosives at 700°C for 300 hours and then fatigue tested. Tests of five non-laser peened specimens all failed in low cycle fatigue regime whereas three identically tested laser peened specimens all achieved multi-million-cycle runout without failure, indicating fully consistent large benefit for life by laser peening. Additional tests also showed fatigue strength improvement of 2:1 by laser peening. Residual stress measurements post hot-corrosion exposure and fatigue testing showed notable 5 mm depth retention of residual eigenstress in a laser peened specimen.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of high energy laser peening followed by pre-hot corrosion on stress relaxation, microhardness and fatigue life and strength of single crystal nickel CMSX-4® superalloy

Morar

Holtham

Hackel

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Laser Shock Peening: A Walkthrough

Sundar

2022

Advanced Engineering of Materials Through Lasers

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Effects of high-energy laser peening followed by pre-hot corrosion on stress relaxation, microhardness, and fatigue life and strength of single-crystal nickel CMSX-4® superalloy

Morar

Holtham

Hackel

et al. 2023

Int J Adv Manuf Technol

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This study investigated the stress relaxation and fatigue life and strength of laser-peened single-crystal nickel superalloy specimens compared to unpeened and shot-peened specimens following hot corrosion exposure and then fatigue testing. The specimens were treated by conventional laser peening and a new cyclic laser peening plus thermal microstructure engineering process. The latter treatment supports the benefit of a unique process involving application of layers of laser peening using high energy with large footprint spots combined with interspersed cyclic annealing. Stress measurements by slitting showed the plastic penetration depth of laser peening exceeded shot peening by a factor of 24. Unpeened and peened specimens were exposed to sulphate corrosives at 700 °C for 300 h and then fatigue tested. Tests of five non-laser-peened specimens all failed in low-cycle fatigue regime, whereas three identically tested laser-peened specimens all achieved multi-million-cycle runout without failure, indicating fully consistent large benefit for life by laser peening. Additional tests also showed fatigue strength improvement of 2:1 by laser peening. Residual stress measurements post hot-corrosion exposure and fatigue testing showed notable 5 mm depth retention of residual eigenstress in a laser-peened specimen.

show abstract

Microstructural evolution in the cross section of Ni-based superalloy induced by high power laser shock processing

Cited by 8 publications

References 37 publications

Effects of high energy laser peening followed by pre-hot corrosion on stress relaxation, microhardness and fatigue life and strength of single crystal nickel CMSX-4® superalloy

Effects of high energy laser peening followed by pre-hot corrosion on stress relaxation, microhardness and fatigue life and strength of single crystal nickel CMSX-4® superalloy

Laser Shock Peening: A Walkthrough

Effects of high-energy laser peening followed by pre-hot corrosion on stress relaxation, microhardness, and fatigue life and strength of single-crystal nickel CMSX-4® superalloy

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