Effect of Cold Rolling Parameters on the Longitudinal Residual Stress Distribution of GH4169 Alloy Sheet

doi:10.1007/s40195-015-0351-4

Abstract

Abstract:

For plastic deformed parts, the dimensional accuracy is significantly affected by residual stresses and so does the performance in service. Therefore, the rolling process of GH4169 alloy sheet at room temperature was investigated by finite element method. The effects of rolling reduction, friction coefficient, rolling velocity and initial stress on the longitudinal residual stress distribution over the thickness of GH4169 alloy sheet were analyzed. The results show that the values of longitudinal residual stress can be slightly reduced by increasing the rolling reduction and velocity. The longitudinal residual stress over the thickness distributes as “V” type or weak “W” type. The initial stress mainly has an effect on the longitudinal stress in the backward slip area. But the friction coefficient has remarkable influence on longitudinal residual stress. With the friction coefficient increasing from 0.1 to 0.5, the value of longitudinal residual stress on the sheet surface is reduced by 282 MPa. Simultaneously, the tensile stress turns into compressive stress with a strong “W” type distribution.

Key words: GH4169 alloy, Cold rolling, Residual stress, Process parameters

Neng-Yong Ye, Ming Cheng, Shi-Hong Zhang. Effect of Cold Rolling Parameters on the Longitudinal Residual Stress Distribution of GH4169 Alloy Sheet[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(12): 1510-1517.

Figures/Tables 12

Fig. 1 FE model of cold rolling and analytical point of residual stress: a finite element model; b analytical points

Table 1 Chemical compositions of GH4169 alloy sheet (in wt%)

C	Cr	Ni	Mo	Al	Nb	Ti	Si	P	S	Fe
0.07	18.94	52.4	2.97	0.49	5.04	1.02	0.08	0.005	0.001	Bal.

Fig. 2 True stress-true strain curve of GH4169 alloy sheet after solution treatment

Table 2 Cold rolling parameters

Rolling reduction (%)	Friction coefficient	Rolling velocity (m/s)	Initial stress	Roller diameter (mm)
10, 30, 50	0.1	0.11	Na
10	0.1, 0.3, 0.5	0.11	Na
10	0.1	0.07, 0.11, 0.14	Na	350
10	0.1	0.11	With

Fig. 3 Longitudinal stress σ11 changes in GH4169 alloy sheet (ε=10%): a longitudinal stress σ11 changes during the cold rolling; b residual stress distribution after the cold rolling

Fig. 4 Influence of rolling reduction on the longitudinal stress and distribution of residual stress: a changes in longitudinal stress on the surface; b distribution of residual stress along the thickness direction

Fig. 5 Longitudinal stress σ11 distribution during the cold rolling (ε=50%)

Fig. 6 Influence of rolling velocity on the longitudinal stress and distribution of residual stress: a changes in longitudinal stress on the surface; b distribution of residual stress over the thickness

Fig. 7 Influence of friction coefficient on the longitudinal stress and distribution of residual stress: a changes in longitudinal stress on the surface; b distribution of residual stress over the thickness

Fig. 8 Longitudinal stress σ11 distributions of GH4169 alloy sheet: a longitudinal stress distribution during cold rolling (μ=0.5); b longitudinal residual stress distribution after cold rolling (μ=0.5)

Fig. 10 Influence of initial stress on the longitudinal stress and distribution of residual stress: a changes in longitudinal stress on the surface; b distribution of residual stress over the thickness

Fig. 11 GH4169 alloy sheet before and after cold rolling (ε = 30%)

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