K439B高温合金变截面铸件缩孔缩松数值模拟与试验  

Simulation and Experimental Investigation of Shrinkage and Porosity for K439B Superalloy Castings with Variable Cross-Sections

作　　者：鄯宇 隋大山 麻晋源 李金锋[2] 董安平[3] 孙宝德[3] SHAN Yu;SUI Da-shan;MA Jin-yuan;LI Jin-feng;DONG An-ping;SUN Bao-de(Institute of Forming Technology&Equipment,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200030,China;Jinan Shengquan Group Share Holding Co.Ltd.,Shandong Jinan 250204,China;Shanghai Key Lab of Advance High-Temperature Materials and Precision Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]上海交通大学材料科学与工程学院塑性成形技术与装备研究院,上海200030 [2]济南圣泉集团股份有限公司,山东济南250204 [3]上海交通大学材料科学与工程学院,上海市先进高温材料与精密成形重点实验室,上海200240

出　　处：《铸造》2023年第12期1560-1567,共8页Foundry

基　　金：国家科技重大专项(J2019-Ⅵ-0004-0117)资助项目。

摘　　要：具有变截面结构特征的铸件极易产生缩孔缩松缺陷,而准确预测并抑制缩孔缩松是制定合理铸造工艺的关键技术之一。采用有限元方法对K439B高温合金变截面铸件精密铸造过程进行了数值模拟,对比分析了Porosity判据、Niyama无量纲判据和APM(Advanced Porosity Model)判据的缩孔缩松数值模拟结果,结合铸造试验结果,确定了APM判据具有更高的数值模拟精度。在此基础上,采用APM判据数值模拟了不同截面铸件的缩孔缩松演化特点。数值模拟结果表明:随着截面比值由2∶1增加到12∶1,特征区域的孔隙率由2.31%增大到4.56%,孔隙总体积由0.44 cm^(3)增加到3.65 cm^(3),并且大体积分数的宏观缩孔逐渐增多,而锥形孔隙的长宽比则不断减小。Castings with variable cross-sections are prone to shrinkage and porosity defects, and it is one of key technologies to accurately predict and eliminate these defects in developing rational casting processes. The numerical simulation was established for the gravity investment casting process of K439B alloy casting with variable cross-sections by employing the finite element method. The numerical simulation results of shrinkage and porosity by using porosity criterion, Niyama dimensionless criterion, and APM(Advanced Porosity Model) criterion, respectively were compared and analyzed, and it demonstrated that the APM criterion had higher numerical simulation accuracy through casting experiments. On this basis, the APM criterion was used to simulate and analyze the evolution characteristics of shrinkage and porosity in castings with different cross-sectional ratios. The numerical simulation results indicate that the porosity in the characteristic region increases from 2.31% to 4.56%, the total porosity volume increase from 0.44 cm^(3) to 3.65 cm^(3), and the macro shrinkage with large volume fractions gradually increases, while the aspect ratio of the conical pore distribution region decreases continuously as the cross-sectional ratio increases from 2∶1 to 12∶1.

关 键 词：镍基高温合金 精密铸造 数值模拟 变截面 缩孔缩松 

分 类 号：TG132.32[一般工业技术—材料科学与工程]