Portevin-Le Chatelier Effect in Nimonic 263 Superalloy

doi:10.1007/s40195-015-0230-z

Abstract

Abstract:

The Portevin-Le Chatelier (PLC) effect in the Nimonic 263 superalloy was investigated by tensile test at a wide temperature ranges from 293 to 1033 K and strain rates between 0.1 and 6.25 × 10^-6 s^-1. Simple binary alloys Ni-0.4C, Ni-24Cr and Ni-5(8)Mo were also tested in order to identify which elements were responsible for the PLC effect in the Nimonic 263 alloy. The results demonstrated that for Nimonic 263 alloy, PLC effect occurred at certain temperatures and low strain rates. Normal PLC effect exhibiting type-A and -(A + B) serrations was attributed to the enhanced solute diffusion with increasing temperature, while inverse PLC effect with type-C serration was caused by unlocking process. The activation energy for the normal PLC effect was calculated to be 68 kJ/mol, and diffusion of substitutional solutes such as Cr and Mo was identified to be responsible for the PLC effect. In comparison with the PLC effect in simple binary alloys, solute atmospheres formed by different kinds of atoms in Nimonic 263 alloy work more effectively, increasing locking strength and corresponding mean stress drop magnitude.

Key words: PLC effect, Dynamic strain aging, Nickel-base alloys, Solute atom

Guo-Ming Han, Cheng-Gang Tian, Chuan-Yong Cui, Zhuang-Qi Hu, Xiao-Feng Sun. Portevin-Le Chatelier Effect in Nimonic 263 Superalloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(5): 542-549.

Figures/Tables 10

Fig. 1 The microstructures of the alloys after solution annealing followed by water quenching: a optical micrograph, b SEM micrograph

Fig. 2 a Typical true stress-true strain curves over the temperature range of 293-1033 K at a strain rate of 4 × 10-4 s-1 and b various types of serrated flow observed in the true stress-true strain curves

Fig. 3 Regimes of occurrence of serrated flow for Nimonic 263 superalloy

Fig. 4 Variation of critical strain for the onset of serrations with the temperature at a strain rate of 4 × 10-4 s-1

Fig. 5 Variation of strain-rate sensitivity with temperature at a true plastic strain of 5%

Fig. 6 The distribution of stress drop magnitude at the typical test temperatures and a strain rate 4 × 10-4 s-1: a 473 K, b 773 K, c 1033 K

Fig. 7 The change of mean stress drop with temperatures at a strain rate of 4 × 10-4 s-1 in Nimonic 263 alloy

Fig. 8 True stress-true strain curves of simple binary alloys over the temperature range of 293-1033 K at a strain rate of 4 × 10-4 s-1: a Ni-0.4C, b Ni-24Cr, c Ni-5Mo, d Ni-8Mo

Fig. 9 Calculated method of the activation energy for the normal PLC effect in Nimonic 263 alloy: a the plot of lnε˙ versus ln ɛc; b the plot of ln [ɛ (m+β)/T] versus 1/T

Fig. 10 Comparison of mean stress drop variation with increasing the temperature at a strain rate of 4 × 10-4 s-1 for Nimonic 263 and Ni-24Cr alloys

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