Effects of Hydrogen Charging on Mechanical Properties of CLAM Steel at Different Strain Rates

doi:10.1007/s40195-022-01515-2

Abstract

Abstract:

The China low-activation martensitic (CLAM) steel has been proposed as a candidate structural material for nuclear fusion reactors. It is essential to study the influence of hydrogen charging and strain rate on the tensile behavior of CLAM steel considering its service environment. In this study, CLAM steel was investigated using tensile tests operated at room temperature before and after hydrogen charging. The results showed that the elongation loss increased significantly with the increase of the hydrogen charging current density at either a low or a high strain rate, which is related to the hydrogen content in the steel. The hydride was systematically studied, including the morphology and the thermal stability as well as the effects on mechanical properties. The possible mechanism of the formation of hydride during hydrogen charging has been analyzed based on the interaction between alloying elements and hydrogen.

Key words: China low-activation martensitic (CLAM) steel, Hydrogen embrittlement, Mechanical properties, Hydride

Yue-Yang Gu, Han-Yu Zhao, Wei Chen, Wei Yan, Liang-Yin Xiong, De-Min Chen. Effects of Hydrogen Charging on Mechanical Properties of CLAM Steel at Different Strain Rates[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(7): 1203-1210.

Figures/Tables 8

Table 1 Main elemental composition of the chosen CLAM steel (in wt%)

C	Cr	W	V	Ta	Mn	Si	P	S	Fe
0.094	8.88	1.48	0.16	0.13	0.50	0.04	0.005	0.003	Bal.

Fig. 1 Shape and dimension of the tensile specimen (unit, mm)

Table 3 Quantity of hydrogen in CLAM steel with and without hydrogen charging measured using TDS

Current density mA/cm²)	H uncharged	5	10	20
H content (ppm)	0	1.90 ± 0.07	4.37 ± 0.11	5.02 ± 0.13

Fig. 2 Micrographs of CLAM steel after heat treatment: a

Fig. 3 Tensile strength and elongation of CLAM steel with and without hydrogen charging

Table 2 Tensile results of CLAM steel with and without hydrogen charging

Strain rate (s⁻¹)	Current density (mA/cm²)	Tensile strength (MPa)	Elongation (%)	I_HE (%)
10⁻³	H uncharged	612 ± 2	22.47 ± 0.53	0
	5	611 ± 3	20.70 ± 0.57	7.88 ± 2.5
	10	611 ± 2	10.07 ± 0.31	55.2 ± 1.4
	20	570 ± 7	5.18 ± 0.88	77.0 ± 3.9
10⁻⁵	H uncharged	586 ± 6	19.90 ± 0.13	0
	5	584 ± 5	12.03 ± 0.24	39.6 ± 1.6
	10	570 ± 6	7.87 ± 0.45	60.5 ± 2.3
	20	519 ± 3	2.30 ± 0.33	88.4 ± 1.8

Fig. 4 SEM fracture surfaces of CLAM steel without hydrogen charging a

Fig. 5 a TDS profiles of CLAM steel with and without hydrogen charging; b engineering stress–strain curves of CLAM steel with hydrogen charging at 10 mA/cm2, and SEM fracture surfaces after c keeping at room temperature for 240 h d heating at 300 °C for 1 h

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