B微合金化对HK40合金铸造疏松的影响

doi:10.11900/0412.1961.2015.00126

金属学报

2015, Vol. 51

Issue (9): 1121-1128 DOI: 10.11900/0412.1961.2015.00126

本期目录 | 过刊浏览

B微合金化对HK40合金铸造疏松的影响

丁贤飞^1,²,刘东方^3,⁴,郑运荣¹,冯强^1,^2,³(

)

2 北京科技大学高端金属材料特种熔炼与制备北京市重点实验室, 北京 100083
3 北京科技大学新金属材料国家重点实验室, 北京 100083
4 北京航空材料研究院熔铸中心, 北京 100095

EFFECT OF B MICRO-ALLOYING ON MICRO-POROSITIES IN AS-CAST HK40 ALLOYS

Xianfei DING^1,²,Dongfang LIU^3,⁴,Yunrong ZHENG¹,Qiang FENG^1,^2,³(

)

1 National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083
2 Beijing Key Laboratory of Special Melting and Preparation of High-End Metal, University of Science and Technology Beijing, Beijing 100083
3 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
4 Melting and Casting Center, Beijing Institute of Aeronautical Materials, Beijing 100095

引用本文:

丁贤飞,刘东方,郑运荣,冯强. B微合金化对HK40合金铸造疏松的影响[J]. 金属学报, 2015, 51(9): 1121-1128.
Xianfei DING, Dongfang LIU, Yunrong ZHENG, Qiang FENG. EFFECT OF B MICRO-ALLOYING ON MICRO-POROSITIES IN AS-CAST HK40 ALLOYS[J]. Acta Metall Sin, 2015, 51(9): 1121-1128.

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摘要:

利用SEM, OM和XRD等手段分析了HK40合金铸件铸造疏松形成原因, 并研究了添加微量B对HK40合金的凝固组织及疏松形成的影响. 结果表明: HK40合金铸件主要存在A和B 2种铸造疏松缺陷. A类疏松主要由于枝晶的快速生长并架桥联接导致架桥枝晶之间区域的补缩不足引起; B类疏松产生原因是相邻枝晶间区域生长的枝晶状M₇C₃型碳化物堵塞枝晶间补缩通道. B微合金化能降低HK40合金铸件较强的柱状晶生长趋势, 细化枝晶, 能抑制HK40合金A类铸造疏松缺陷的产生. 同时, B微合金化增加了HK40合金枝晶间共晶相的体积分数, 使枝晶间呈枝晶状M₇C₃型碳化物转变为层片状的M₂₃C₆型碳化物析出, 避免碳化物堵塞相邻枝晶间的补缩通道, 因而也减小了B类铸造疏松缺陷的形成倾向.

关键词 ： HK40合金, B微合金化, 铸造疏松, 硼化物, 碳化物

Abstract：

Casting microporosity defect is one of the important issues for as-cast HK40 alloys preparation, which is of great importance to application performance of the alloy castings. A comprehensive understanding of the mechanism on formation of the casting microporosity defect is still unclear for the alloys. In this work, the casting microporosity defect and influences of boron micro-alloying on the as-cast microstructures and microporosities in HK40 alloys castings were investigated by means of SEM, OM and XRD, etc.. The microstructures in the HK40 alloys with and without boron micro-alloying after quenching at high temperatures were also examined to check the solidification characteristic change attribute to boron addition. The results show that there are two types of casting microporosities in the castings. Type A is mainly caused by the rapid growth of dendrites and thus dendritic bridge connecting which lead to feeding shortages between the bridge dendrites. Type B is, however, resulted by the growth of M₇C₃ carbides in coarsened dendritic morphology which induce to the feeding channel blockage in adjacent interdendritic regions. Boron micro-alloying decreases the tendency of columnar grain formation and refines the dendrites in HK40 alloys which therefore suppresses the casting microporosity defect of type A. Additionally, boron micro-alloying not only increases the volume fraction of eutectic phases, but also changes the M₇C₃ carbides in dendritic morphology into the M₂₃C₆ carbides in lamellar morphology, which prevents the feeding channal blockage in adjacent interdendritic regions, thus reduces the casting microporosity defect of type B.

Key words： HK40 alloy B micro-alloying casting microporosity boride carbide

基金资助:*国家高技术研究发展计划项目2012AA03A511, 高等学校学科创新引智计划项目B12012及中央高校基本科研业务费项目FRF-TP-14-062A2资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00126 或 https://www.ams.org.cn/CN/Y2015/V51/I9/1121

表1 铸态HK40系列合金的化学成分

图1 HK40合金铸件中的典型铸造疏松显微组织的OM像

图2 HK40合金铸件内部铸造疏松显微组织的SEM像

图3 HK40, HK40-0.1B和HK40-0.4B合金铸锭纵剖面显微组织的OM像

图4 HK40, HK40-0.1B和HK40-0.4B合金铸锭显微组织的OM像

图5 HK40和HK40-0.4B铸态合金萃取相的XRD谱

图6 HK40, HK40-0.1B和HK40-0.4B铸态合金枝晶间显微组织的SEM-BSE像

图7 HK40和HK40-0.4B合金相萃取后枝晶间析出相的SEM像

图8 HK40和HK40-0.4B铸态合金在不同温度保温15 min淬火后的显微组织的OM像

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