Effects of Titanium and Silicon on the Swelling Behavior of 15-15Ti Steels by Heavy-Ion Beam Irradiation

doi:10.1007/s40195-017-0581-8

Abstract

Abstract:

The swelling behavior of 20% cold-worked 15-15Ti steels with (0.23-0.40) wt% titanium and (0.42-0.81) wt% silicon content after heavy-ion beam irradiation has been investigated by transmission electron microscopy. The results show that 15-15Ti steel with higher titanium content displays lower swelling. As silicon content increases, the cavity size and the swelling of the 15-15Ti steels decrease obviously. Titanium and silicon may play important roles in suppressing the cavity nucleation and growth in 15-15Ti steel.

Key words: 15-15Ti, Swelling, Heavy-ion beam irradiation

Ai-Bing Du, Wei Feng, Hai-Liang Ma, Tian Liang, Da-Qing Yuan, Ping Fan, Qiao-Li Zhang, Chen Huang. Effects of Titanium and Silicon on the Swelling Behavior of 15-15Ti Steels by Heavy-Ion Beam Irradiation[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(11): 1049-1054.

Figures/Tables 8

Table 1 Typical chemical compositions of the domestic 15-15Ti steels

No.	C	Cr	Ni	Mo	Ti	Si	P	S	O	N
1	0.056	16.19	15.03	2.11	0.40	0.81	0.009	<0.01	<0.01	<0.02
2	0.045	16.18	15.07	2.10	0.23	0.43	0.008	<0.01	<0.01	<0.02
3	0.056	16.23	14.98	2.10	0.38	0.42	0.008	<0.01	<0.01	<0.02

Fig. 1 Depth profiles of the implanted helium a and nickel ions with its damage b

Fig. 2 Montaged TEM images for sample 1#

Fig. 3 a Dark field image of the sample under the STEM mode; b the relative thickness of the measured region is displayed in shade of gray. The green rectangle in a indicates the measured region by EELS. The black dots in the selected region are the cavities induced by the heavy-ion beam irradiation. The blue rectangle in b indicates the region that was selected to evaluate the average thickness. The width of the rectangle is about 100 nm

Fig. 4 Helium preimplantation area under TEM: a TEM image of the preimplanted sample with helium; b TEM image of the preimplanted sample after keeping temperature at 580 °C for 240 h; c TEM image of the preimplanted sample followed by heavy-ion beam irradiation. The region between the two green lines suggests helium preimplantation area

Fig. 5 TEM images from the three 15-15Ti samples

Table 2 Swelling evaluating data and composition contrast of the 15-15Ti steels

No.	Swelling (%)	Diameter (nm)	Density (10¹⁷ cm^-3)	Ti/C	Si
1	3.57	4.89	2.46	7.14	0.81
2	5.31	6.44	1.19	5.11	0.43
3	4.50	6.23	1.48	6.79	0.42

Fig. 6 a Cavity size distribution observed by TEM; b volume fraction of the cavities with different sizes. A step of 1 nm was used in counting

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