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| THE DISTRIBUTION OF BORON IN STEEL |
| Ho Hsin-lai;Chu Yu-yi;Chang Hsiu-lin;Yu Tsung-sen;Li Chiu-ping (student);Yin Hsi-kuang (student) Peking Institute of Iron and Steel Technology |
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Cite this article:
Ho Hsin-lai;Chu Yu-yi;Chang Hsiu-lin;Yu Tsung-sen;Li Chiu-ping (student);Yin Hsi-kuang (student) Peking Institute of Iron and Steel Technology. THE DISTRIBUTION OF BORON IN STEEL. Acta Metall Sin, 1977, 13(4): 235-356.
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Abstract The distribution of boron and its effect on the hardenability of a 25Mn-TiBR steel have been investigated by means of modified particle-tracking auto-radiography. The results indicate that boron exists in the forms of equilibrium andnon-equilibrium segregation along grain boundaries. The equilibrium segrega-tion of boron disappeared during high temperature austenization. The non-equi-librium segregation along grain boundaries of a quenched boron steel occurredduring cooling by diffusion from their neighbouring regions. The degree of segre-gation increased and a boron depleted-zone appeared next to the boundaries asthe austenizing temperature was raised. The effect of rare earth additives on the distribution of boron in 25MnTiBRsteel has also been investigated. It was found that within a certain temperaturerange the segregation of boron to austenite grain boundaries was hindered bythe addition of 0.4％ mischmetal. This was possibly caused by an equilibriumsegregation of rare earth elements along the austenite grain boundaries. It hasbeen confirmed that the simultaneous addition of boron and rare earth mischme-tal further increases the hardenability of the steel. Suggestions have been maderelating to the possible mechanism of this effect.
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Received: 18 April 1977
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[6] #12．
[7] #12． |
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