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

doi:10.11900/0412.1961.2015.00126

Acta Metall Sin

2015, Vol. 51

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

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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

Cite this article:

Xianfei DING,Dongfang LIU,Yunrong ZHENG,Qiang FENG. EFFECT OF B MICRO-ALLOYING ON MICRO-POROSITIES IN AS-CAST HK40 ALLOYS. Acta Metall Sin, 2015, 51(9): 1121-1128.

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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

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	Xianfei DING
	Dongfang LIU
	Yunrong ZHENG
	Qiang FENG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00126 OR https://www.ams.org.cn/EN/Y2015/V51/I9/1121

Table 1 Chemical compositions of as-cast HK40 series alloys

Fig.1 Typical OM image of casting microporosity in the HK40 alloy castings

Fig.2 SEM images of the casting microporosities in HK40 alloy (a), and high magnified microstructures of type A (b) and type B (c) microporosities shown in Fig.2a

Fig.3 Longitudinal OM images of the cast ingots in HK40 (a), HK40-0.1B (b) and HK40-0.4B (c) alloys

Fig.4 OM images of HK40 (a), HK40-0.1B (b) and HK40-0.4B (c) alloys

Fig.5 XRD spectra of the extract phases in as-cast HK40 and HK40-0.4B alloys

Fig.6 SEM-BSE images in interdendritic regions in the cast HK40 (a), HK40-0.1B (b) and HK40-0.4B (c) alloys

Fig.7 SEM images of the precipitated phases in interdendritic regions of the HK40 (a) and HK40-0.4B (b) alloys after phase extraction

Fig.8 OM images of quenched microstructures in HK40 (a, c, e) and HK40-0.4B (b, d, f) alloys after heated for 15 min at 1210 ℃ (a, b), 1250 ℃ (c, d) and 1290 ℃ (e, f)

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