厚壁離心管坯溫度場和熱應(yīng)力場的數(shù)值模擬及其軸向裂紋分析

Numerical Simulation of Temperature Field and Stress Field for and Axial Crack Analysis of Heavy-wall Centrifugally Cast Hollow Bloom

摘要: 運用有限元分析軟件ANSYS 8.0/Multiphysics對材質(zhì)為21CrMo10鋼的離心管坯,在不同工藝參數(shù)下的溫度場和熱應(yīng)力場進行了分析。結(jié)合生產(chǎn)實際得出:厚壁離心管坯出現(xiàn)軸向裂紋的原因在于管模內(nèi)壁涂層太薄、管坯橫截面的溫度梯度∧10℃/ mm;隨著管模內(nèi)壁涂層厚度的減薄,鋼液澆注溫度的升高,厚壁管坯內(nèi)壁的熱應(yīng)力有增大的趨勢。據(jù)此進一步優(yōu)化和確定了在特定情況下澆注合格管坯的工藝參數(shù)。

Abstract: Analyzed are the temperature field and thermal stress field of the centrifugally cast hollow bloom in 21CrMo10 steel under different technological parameters by means of the FE analysis software ANSYS 8.0/ Multipysics. Based on the analysis result and relevant operation result, it is identified that the cause for the axial cracking of the said hollow bloom is the insufficient inner surface coat thickness and the temperature gradient∧10 ℃/mm of the casting mould; and that along with the reducing of the said coat thickness, the molten steel temperature is going up, resulting in a trend of the bloom inner surface thermal stress to increase. Accordingly, the parameters for coating the mould inner surface is further optimized and determined for casting qualified hollow blooms under specific operation conditions.