Thermal stress relaxation in shot peened and laser peened nickel-based superalloy

doi:10.1016/j.jmst.2020.03.059

Abstract

Abstract:

The effects of cold work produced by peening processes in residual stress relaxation under elevated temperatures were investigated. Two types of peening processes namely shot peening and laser peening were used to generate different amount of cold work and residual stresses in the study. Characterisation of residual stress induced by cold working were carried out using X-ray diffraction coupled with electrochemical polishing method to measure the variation of residual stress with depth. Residual stresses in shot peened samples were observed to relax more rapidly than that of laser peened ones when subjected to thermal exposure. The data collected from the experimental investigation was then used to build a correlation function to model the effects of cold work on residual stress relaxation. A parameter describing cold work’s contribution to stress relaxation is introduced into the well-known Zener-Wert-Avrami (ZWA) model. The model was validated against experimental measurements and showed good agreement in both shot peened and laser peened samples.

Key words: Residual stress, Cold work, Surface treatment, Nickel-based superalloys

K.S. Chin, S. Idapalapati, D.T. Ardi. Thermal stress relaxation in shot peened and laser peened nickel-based superalloy[J]. J. Mater. Sci. Technol., 2020, 59: 100-106.

Figures/Tables 14

Table 1 Chemical composition of Inconel 718 (wt.%).

C	Mn	Fe	S	Si	Cu	Ni	Cr
0.03	0.05	18.35	0.001	0.06	0.03	53.46	18.46
Al	Ti	Co	Mo	Ta	B	Nb	P
0.51	0.98	0.13	3.03	0.003	0.004	5.33	0.007

Table 2 Exposure temperature and duration of thermal exposure.

Exposure temperature (°C)	Thermal exposure duration (h)
250	1, 10, 20
400	1, 5, 10
600	1, 10

Table 3 FWHM fitting parameters for Inconel 718 treated according to AMS 5663.

H	I	J	K
0.9622	0.4808	0.0410	2.65

Fig. 1. Residual stress profiles of shot peened and laser peened specimens.

Fig. 2. Stress profiles of shot peened and laser peened specimens at 600 °C.

Fig. 3. Stress profiles of shot peened and laser peened specimens at 400 °C and 250 °C.

Fig. 4. FWHM graph of shot peened and laser peened specimens.

Fig. 5. GOS maps of shot peened and laser peened specimens.

Fig. 6. Surface FWHM at various temperature and duration of exposure, (a) shot peening, (b) laser peening.

Fig. 7. Conversion of cold work percentage from FWHM.

Fig. 8. Correlation between residual stress retained and cold work percentage at various temperature for shot peened specimens.

Fig. 9. Correlation between residual stress retained and cold work percentage at various temperature and duration of exposure for shot peened specimens.

Fig. 10. Influence of cold work and exposure time on the thermal relaxation of shot peened IN718 specimen.

Fig. 11. Comparison between experimental and modelled profile of residual stress for shot peened and laser peened specimen at (a) 250 °C, (b) 400 °C, (c) 600 °C.

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