| Autor: |
Demchuk, I. S., Sinyakov, K. A., Sinyakova, N. V. |
| Zdroj: |
Metal Science and Heat Treatment; June 1977, Vol. 19 Issue: 6 p428-436, 9p |
| Abstrakt: |
1.The cooling rate affects the mechanism of the formation and growth of martensite crystals. The development of martensite needles during cooling at a rate >1 deg/min occurs by layers and very suddenly, i.e., the first needle does not grow and the martensitic transformation occurs with formation of new needles in front of it that are symmetrical with respect to the slip plane. With a cooling rate <1 deg/min the needles grow as the result of ,“elongation,” i.e., even movement of the primary slip plane, with retention of the lenticular shape.2.The growth mechanism of martensite crystals determines not only the microkinetics but also the internal structure of martensite.3.From the final structure it is impossible to judge the kinetics of martensite formation. Separation of the polythermal and isothermal portions of martensite is possible only by direct observation of the martensitic transformation. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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