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| A STUDY OF HYDROGEN EFFECT ON DEFORMATION AND FRACTURE MICROPROCESS IN PURE IRON |
| by Chen Lian; Liu Minzhi; Su Huihe; Yin wanquan and Li Cuiping (Institute of Metal Research; Academia Sinica) |
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Cite this article:
by Chen Lian; Liu Minzhi; Su Huihe; Yin wanquan and Li Cuiping (Institute of Metal Research; Academia Sinica). A STUDY OF HYDROGEN EFFECT ON DEFORMATION AND FRACTURE MICROPROCESS IN PURE IRON. Acta Metall Sin, 1981, 17(5): 541-606.
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Abstract The effect of hydrogen on the deformation and fracture microprocess in pure iron has been studied by means of the tensile test and observation in S4-10 SEM using cathodic charged specimens. The main results are as following:1. With the increase of hydrogen content, namely, from 5.4 up to 31.0 cm~3/100g, the yield strength increases slightly, the flow stress and the fracture strength increase obviously, but the fracture strain decreases remarkably. The lower yield point and Luders band disappear when the hydrogen content exceeds 18.7cm~3/100g.2. The nucleation of a microcrack is predominately on the slip plane and the microcrack propagates along subboundaries when hydrogen content is below 10 cm~3/100g. The nucleation of a microcrack is on the grain boundaries and the microcrack propagates in a zigzag way when hydrogen content exceeds 16 cm~3/100 g, The former is transgranular fracture and the latter is a mixed fracture of transgranular and intergranular.3. The characteristics of the hydrogen embrittlement in pure iron are: (1)the slip lines on the specimen surface decrease obviously, and (2) the microfracture of brittle feature is formed and increased. This seems due to that the dissolved hydrogen in pure iron decreases the plasitc deformation.
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Received: 18 May 1981
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