Prediction of Distortion in Steel Plate after Spray Quenching Dung-An Wang Graduate Institute of Precision Engineering, National Chung Hsing University Taiwan, ROC
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.
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.
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2011-03-31)
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.
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
鋼板靜止之遮蔽淬火模擬
Mesh
Simulation INITIAL TEMPERATURE 800 COUPLED TEMPERATURE-DISPLACEMENT One half model due to geometry symmetry Material S50C
Thermal convection film property for center [J/m2/sec/C] [C] 4350.0 , 0. 8207.0 , 200.0 11962.0 , 400.0 13492.0 , 430.0 12500.0 , 500.0 10206.0 , 560.0 7793.0 , 600.0 2507.0 , 700.0 437.0 , 800.0 135.3 , 900.0 film property for edge [J/m2/sec/C] [C] 1305.0 , 0. 2462.1 , 200.0 3588.6 , 400.0 4047.6 , 430.0 3750.0 , 500.0 3061.8 , 560.0 2337.9 , 600.0 752.1 , 700.0 131.1 , 800.0 40.6 , 900.0
Temperature history after 20sec quenching 800 C – 651 C
Temperature contour after 20sec quenching
Temperature contour after 20sec quenching
Deformed shape after 20sec quenching
Stress contour after 20sec quenching
Stress contour after 20sec quenching