Features of Electroplastic Effect in Alloys with Martensite Transformation

doi:10.1007/s40195-018-0747-z

Abstract

Abstract:

Influence of different electric current modes (pulse and direct) on occurrence of the electroplastic effect under uniaxial tension in the coarse-grained alloys with martensite transformations is investigated. The materials are shape memory Ti_49.3Ni_50.7 alloy and metastable austenite transformation-induced plasticity (TRIP) steel. The paper contains experimental results of current impact on the “stress-strain” curves of the material. It has been taken an experimental measurement of the sample temperature during the test. It is shown that the shape of a stress-strain curves and type of the serrate plastic flow, connected with the martensitic transformation and electroplastic effect, depend on the current modes. Impact of pulse current and direct current suppresses shape memory and TRIP effect.

Key words: Electroplastic effect, TRIP effect, Pulse current, Deformation, Martensite transformation, Tension

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Vladimir Stolyarov. Features of Electroplastic Effect in Alloys with Martensite Transformation[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(12): 1305-1310.

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URL: https://www.met-adv.cn/EN/10.1007/s40195-018-0747-z

https://www.met-adv.cn/EN/Y2018/V31/I12/1305

Figures/Tables 5

Table 1 Sample temperature under current introduction

Current mode	T (°C)
Without current	18
Single pulses	24
Multipulse current	37
Direct current	69

Table 1 Sample temperature under current introduction

Current mode	T (°C)
Without current	18
Single pulses	24
Multipulse current	37
Direct current	69

Fig. 1 Stress-strain curves for Ti49.3Ni50.7 alloy: 1—without current; 2—single pulses; 3—multipulse current; 4—direct current

Table 2 Mechanical properties of TRIP steel after tension with different current modes

Phase state	Current regimes	Impact time (s)	T (°C)	UTS (MPa)	YS (MPa)	δ (%)
A + M	No current	-	RT	1880	1830	27
	Single pulse, j = 460 A/mm²	30?×?10^-3	RT	1780	1700	20
	Pulse current, j = 200 A/mm², τ =1?×?10^-3 s^-1	80	150	1600	1400	2.3
	Direct current, j = 14 A/mm²	80	200	1350	1000	2.4
M	No current	-	RT	1200	1100	2.5
	Single pulse, j = 460 A/mm²	6?×?10^-3	RT	1160	1100	1.7
	Pulse current, j = 200 A/mm², τ?=?1?×?10^-3 s^-1	50	150	1160	1100	1.2
	Direct current, j = 14 A/mm²	96	200	1170	550	3.0

Table 2 Mechanical properties of TRIP steel after tension with different current modes

Phase state	Current regimes	Impact time (s)	T (°C)	UTS (MPa)	YS (MPa)	δ (%)
A + M	No current	-	RT	1880	1830	27
	Single pulse, j = 460 A/mm²	30?×?10^-3	RT	1780	1700	20
	Pulse current, j = 200 A/mm², τ =1?×?10^-3 s^-1	80	150	1600	1400	2.3
	Direct current, j = 14 A/mm²	80	200	1350	1000	2.4
M	No current	-	RT	1200	1100	2.5
	Single pulse, j = 460 A/mm²	6?×?10^-3	RT	1160	1100	1.7
	Pulse current, j = 200 A/mm², τ?=?1?×?10^-3 s^-1	50	150	1160	1100	1.2
	Direct current, j = 14 A/mm²	96	200	1170	550	3.0

Fig. 2 Stress-strain curves of TRIP steel in austenite-martensite state: a without current; b single-pulse current; c multipulse current; d direct current

Fig. 3 Stress-strain curves of TRIP steel in martensite state: a without current; b single-pulse current; c multipulse current; d direct current

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