PL425829A1 - Method for heat treatment of surface carburized steel - Google Patents
Method for heat treatment of surface carburized steelInfo
- Publication number
- PL425829A1 PL425829A1 PL425829A PL42582918A PL425829A1 PL 425829 A1 PL425829 A1 PL 425829A1 PL 425829 A PL425829 A PL 425829A PL 42582918 A PL42582918 A PL 42582918A PL 425829 A1 PL425829 A1 PL 425829A1
- Authority
- PL
- Poland
- Prior art keywords
- temperature
- carburized
- cooled
- heat treatment
- transformation
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title abstract 4
- 239000010959 steel Substances 0.000 title abstract 4
- 238000010438 heat treatment Methods 0.000 title abstract 2
- 238000000034 method Methods 0.000 title abstract 2
- 230000009466 transformation Effects 0.000 abstract 6
- 229910001563 bainite Inorganic materials 0.000 abstract 3
- 229910000734 martensite Inorganic materials 0.000 abstract 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Sposób obróbki cieplnej stali nawęglonej powierzchniowo, w którym element stalowy nawęgla się do zawartości powierzchniowej węgla w zakresie 0,60 - 1,10%mas., nagrzewa się do temperatury austenityzowania TA i wytrzymuje się w tej temperaturze przez określony czas tA, po czym: (Q1) chłodzi się z szybkością większą niż krytyczna prędkość chłodzenia do temperatury Ti1 pierwszego przystanku izotermicznego, takiej że Ms(r) + 20°C ? Ti1 ? 400°C, gdzie Ms(r) oznacza temperaturę początku przemiany martenzytycznej w nienawęglonym rdzeniu; korzystnie temperatura Ti1 ? 350°C; (B1) wytrzymuje w temperaturze Ti1 przez czas ti1 potrzebny do obniżenia temperatury Ms(r) w wyniku przemiany bainitycznej w rdzeniu poniżej temperatury Ti2 drugiego przestanku izotermicznego; (Q2) chłodzi się z temperatury Ti1 do temperatury Ti2 drugiego przystanku izotermicznego, w której zachodzi przemiana bainityczna w nawęglonej warstwie, takiej że Ms(w) + 20°C ? Ti2 < Ti1, gdzie Ms(w) oznacza temperaturę przemiany martenzytycznej w nawęglonej warstwie; korzystnie 220°C ? Ti2 ? 300°C; (B2) wytrzymuje się w temperaturze Ti2 przez czas potrzebny do zakończenia przemiany bainitycznej w nawęglonej warstwie lub do obniżenia temperatury początku przemiany martenzytycznej w warstwie Ms(w) poniżej temperatury 0°C lub, jeśli element stalowy jest eksploatowany poniżej temperatury 0°C, to poniżej minimalnej temperatury eksploatacji elementu; (Q3) chłodzi się z temperatury Ti2 do temperatury otoczenia.A method of heat treatment of surface carburized steel, in which the steel element is carburized to a surface carbon content in the range of 0.60 - 1.10% by mass, is heated to the austenitizing temperature TA and is held at this temperature for a specified time tA, then: (Q1) is cooled at a rate greater than the critical cooling rate to the temperature Ti1 of the first isothermal stop, such that Ms (r) + 20 ° C? Ti1? 400 ° C, where Ms (r) is the onset temperature of the martensitic transformation in the uncarbonated core; preferably the temperature of Ti1 350 ° C; (B1) withstand the temperature Ti1 for the time ti1 needed to lower the temperature Ms (r) due to the bainite transformation in the core below the temperature Ti2 of the second isothermal stop; (Q2) is cooled from the temperature of Ti1 to the temperature of Ti2 of the second isothermal stop, where a bainite transformation takes place in the carburized layer, such that Ms (w) + 20 ° C? Ti2 <Ti1, where Ms (w) is the martensitic transformation temperature in the carburized layer; preferably 220 ° C Ti2? 300 ° C; (B2) is held at the temperature of Ti2 for the time needed to complete the bainite transformation in the carburized layer or to lower the martensitic transformation start temperature in the Ms (w) layer below 0 ° C or, if the steel element is operated below 0 ° C, below the minimum operating temperature of the element; (Q3) is cooled from Ti2 to ambient temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL425829A PL236791B1 (en) | 2018-06-05 | 2018-06-05 | Method for heat treatment of surface carburized steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL425829A PL236791B1 (en) | 2018-06-05 | 2018-06-05 | Method for heat treatment of surface carburized steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL425829A1 true PL425829A1 (en) | 2019-12-16 |
| PL236791B1 PL236791B1 (en) | 2021-02-22 |
Family
ID=69054352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL425829A PL236791B1 (en) | 2018-06-05 | 2018-06-05 | Method for heat treatment of surface carburized steel |
Country Status (1)
| Country | Link |
|---|---|
| PL (1) | PL236791B1 (en) |
-
2018
- 2018-06-05 PL PL425829A patent/PL236791B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PL236791B1 (en) | 2021-02-22 |
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