Prediction of Distortion in Steel Plate after Spray Quenching

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1 Prediction of Distortion in Steel Plate after Spray Quenching
Dung-An Wang Graduate Institute of Precision Engineering, National Chung Hsing University Taiwan, ROC

2 鋼板澆水淬火後之變形 鋼板上下表面之溫差 邊部遮蔽 相變組織不均勻(中国冶金科技网2011-03-31) 橫向C形翹曲
邊部或尾部翹起来的L形翹曲 切成條状后產生的切條状翹曲 Liao et al., 2012. Kim et al., 2009.

3 邊部遮蔽 鋼板若不遮蔽邊部水量 則邊緣通常會過冷，遮蔽後，邊緣溫度會逐漸提高 使鋼板溫度分佈較均勻 余伟, 2009. 羅偉, 2013.

4 需要控制鋼板的冷却均匀性 淬火後鋼板板形平直 组織性能一致 殘餘應力小 (中国冶金科技网 )

5 含邊部遮蔽效應的鋼板澆水淬火模擬 鋼板尺寸 3.6米寬 10米長 25mm厚 起冷溫度約800度C 完溫度約540度C 羅偉, 2013.

6 工作排程 鋼板靜止之遮蔽淬火模擬 使用副程式(Film)進行鋼板靜止之遮蔽淬火模擬 驗證副程式正確
模擬遮蔽寬度、水柱強度、側向噴注、上下表面噴注 等參數對下列結果的影響 鋼板板形 鋼板變形量 淬火组織 殘餘應力

7 鋼板靜止之遮蔽淬火模擬

8 Mesh

9 Simulation INITIAL TEMPERATURE 800 COUPLED TEMPERATURE-DISPLACEMENT
One half model due to geometry symmetry Material S50C

10 Thermal convection film property for center [J/m2/sec/C] [C]
, 0. , 200.0 , 400.0 , 430.0 , 500.0 , 560.0 , 600.0 , 700.0 437.0 , 800.0 135.3 , 900.0 film property for edge [J/m2/sec/C] [C] , 0. , 200.0 , 400.0 , 430.0 , 500.0 , 560.0 , 600.0 752.1 , 700.0 131.1 , 800.0 40.6 , 900.0

11 Temperature history after 20sec quenching
800 C – 651 C

12 Temperature contour after 20sec quenching

13 Temperature contour after 20sec quenching

14 Deformed shape after 20sec quenching

15 Stress contour after 20sec quenching

16 Stress contour after 20sec quenching