Szczegóły publikacji
Opis bibliograficzny
Silicon influence on the microstructure formation at cooling rates lower than the critical rate / J. PACYNA // Journal of Achievements in Materials and Manufacturing Engineering ; ISSN 1734-8412. — 2012 — vol. 54 iss. 2, s. 178–184. — Bibliogr. s. 183–184, Abstr. — Publikacja dostępna online od: 2012-10-01
Autor
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 68055 |
|---|---|
| Data dodania do BaDAP | 2012-09-28 |
| Tekst źródłowy | URL |
| Rok publikacji | 2012 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Journal of Achievements in Materials and Manufacturing Engineering |
Abstract
Purpose: On the bases of fundamental research [1], on the silicon influence on the kinetics of phase transformation of undercooled austenite in model ferrous alloys with carbon of a weak background of other alloying elements, it was found that up to the Si content of 1 mass % the steel hardenability decreases. The time before the start of the ferrite precipitation decreases as well as the time before the start of the pearlite and bainite formation. On the other hand in model ferrous alloys with carbon of a strong background of other elements, also in the range to app. 1 Si %, the time before the start of the ferrite precipitation and bainite formation is insignificantly prolonged (hardenability increases minimally), while the location of the start of the pearlitic transformation remains practically the same. This observation, being a part of designing the ferrous alloys structure, can be successfully utilised, among others, in steels for working rolls for plates cold-rolling. Due to that in these expensive tools we are able to soften the influence of the structural notch, which is formed - at a certain depth - by the upper bainite layer, in steels without silicon additions. Design/methodology/approach: Dilatometric investigations were performed using a DT 1000 dilatometer of a French company Adamel. Findings: An addition of 1 mass % of silicon causes a gradual vanishing of the steel bainitisation, being the bainite slipping in ‘under pearlite’, due to which the austenite, at continuous cooling, will be at first transformed into pearlite, on its grain boundaries, and only later - inside grains - into bainite. Even if it is the upper bainite its location inside grains, within the pearlite envelope, is less dangerous for the crack resistance than its location on grain boundaries. Research limitations/implications: These observations can be utilized for steels in which the bainitic transformations are shifted in the direction of shorter times (e.g. in chromium - molybdenum steels). Especially when this is the upper bainite known for its low crack resistance. Practical implications: Due to this work in expensive tools we are able to soften the influence of the structural notch, which is formed - at a certain depth - by the upper bainite layer, in steels without silicon additions. Originality/value: Details descriptions of influence of the Si content on the kinetics of phase transformations during cooling in model ferrous carbon alloys with a weak background and also strong background of other alloying elements.
