کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1585763 | 1514922 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effects of deformation and boron on microstructure and continuous cooling transformation in low carbon HSLA steels Effects of deformation and boron on microstructure and continuous cooling transformation in low carbon HSLA steels](/preview/png/1585763.png)
The continuous-cooling-transformation (CCT) diagram and continuous cooled microstructure were investigated for low carbon (0.05 wt.% C) high strength low alloy steels with/without boron. Microstructures observed in continuous cooled specimens were composed of pearlite, quasi-polygonal ferrite, granular bainite, acicular ferrite, bainitic ferrite, lower bainite, and martensite depending on cooling rate and transformation temperature. A rapid cooling rate depressed the formation of pearlite and quasi-polygonal ferrite, which resulted in higher hardness. However, hot deformation slightly increased transformation start temperature, and promoted the formation of pearlite and quasi-polygonal ferrite. Hot deformation also strongly promoted the acicular ferrite formation which did not form under non-deformation conditions. Small boron addition effectively reduced the formation of pearlite and quasi-polygonal ferrite and broadened the cooling rate region for bainitic ferrite and martensite.
Journal: Materials Science and Engineering: A - Volume 422, Issues 1–2, 25 April 2006, Pages 157–162