工业加热
工業加熱
공업가열
INDUSTRIIAL HEATING
2014年
6期
23-27
,共5页
葛栋%李京社%杨树峰%高向宙%白李国
葛棟%李京社%楊樹峰%高嚮宙%白李國
갈동%리경사%양수봉%고향주%백리국
Cr-Co-Mo-Ni齿轮钢%真空电弧重熔%工艺参数%数值模拟
Cr-Co-Mo-Ni齒輪鋼%真空電弧重鎔%工藝參數%數值模擬
Cr-Co-Mo-Ni치륜강%진공전호중용%공예삼수%수치모의
Cr-Co-Mo-Ni gear steel%vacuum arc remelting%process parameters%numerical simulation
为进一步提高Cr-Co-Mo-Ni齿轮钢材料的均匀性和细晶化,建立了直径290 mm的齿轮钢钢锭真空自耗熔炼过程三维数学模型,研究了熔炼工艺参数对钢锭凝固组织分布及晶粒大小的影响规律。结果表明:在工艺参数可调范围内,冷却强度越大,晶粒尺寸越小、数目越多,二次枝晶间距越小;熔池温度越低,晶粒的细化效果越好,二次枝晶间距也越小;降低冶炼速率,形核数目增多,晶粒尺寸减小,但对二次枝晶间距的影响较小。对齿轮钢真空自耗熔炼工艺参数优化调整后,模拟结果显示,自耗锭内部等轴晶区域增大将近一倍,晶粒尺寸得到明显细化;最大二次枝晶间距减小了4.88%,合金元素分布实现均匀化。
為進一步提高Cr-Co-Mo-Ni齒輪鋼材料的均勻性和細晶化,建立瞭直徑290 mm的齒輪鋼鋼錠真空自耗鎔煉過程三維數學模型,研究瞭鎔煉工藝參數對鋼錠凝固組織分佈及晶粒大小的影響規律。結果錶明:在工藝參數可調範圍內,冷卻彊度越大,晶粒呎吋越小、數目越多,二次枝晶間距越小;鎔池溫度越低,晶粒的細化效果越好,二次枝晶間距也越小;降低冶煉速率,形覈數目增多,晶粒呎吋減小,但對二次枝晶間距的影響較小。對齒輪鋼真空自耗鎔煉工藝參數優化調整後,模擬結果顯示,自耗錠內部等軸晶區域增大將近一倍,晶粒呎吋得到明顯細化;最大二次枝晶間距減小瞭4.88%,閤金元素分佈實現均勻化。
위진일보제고Cr-Co-Mo-Ni치륜강재료적균균성화세정화,건립료직경290 mm적치륜강강정진공자모용련과정삼유수학모형,연구료용련공예삼수대강정응고조직분포급정립대소적영향규률。결과표명:재공예삼수가조범위내,냉각강도월대,정립척촌월소、수목월다,이차지정간거월소;용지온도월저,정립적세화효과월호,이차지정간거야월소;강저야련속솔,형핵수목증다,정립척촌감소,단대이차지정간거적영향교소。대치륜강진공자모용련공예삼수우화조정후,모의결과현시,자모정내부등축정구역증대장근일배,정립척촌득도명현세화;최대이차지정간거감소료4.88%,합금원소분포실현균균화。
To further improve the high uniformity and grain refining of Cr-Co-Mo-Ni Gear Steel materials, a three-dimensional mathematical model of vacuum arc remelting process of 290 mm diameter was established, and the influence rule of remelting process parameters on solidification characteristics and grain size was carried on research. It is shown that within the scope of the adjustable parameters, increasing cooling intensity can minish the grain size and secondary dendrite arm spacing (SDAS), increase the number of grains; reducing bath temperature can refine grain effectively, decrease SDAS; decreasing smelting rate can increase the number of nucleation and minish the grain size, but has little effect on SDAS. After optimizing the remelting process parameters, the equiaxial crystal rate of consumable ingot increased nearly doubled and the grains got refined obviously; the maximum SDAS decreased by 4.88%and the alloying elements distribution realized homogenization.