IMR OpenIR
Hardenability and Critical Average Cooling Rates of 7B50 Aluminum Alloy
Kang Lei1; Zhao Gang1; Liu Kung2; Tian Ni1
2019
Source PublicationRARE METAL MATERIALS AND ENGINEERING
ISSN1002-185X
Volume48Issue:1Pages:309-316
AbstractThe hardenability and critical cooling rates of 7B50 alloy were investigated based on measured cooling curves obtained from the spray quenching test on modified Jominy specimen, electrical conductivity and hardness in different aging tempers, and microstructures evolution in natural aging temper. Results show that the hardened depth of 7B50 alloy is about 70 mm in natural aging temper while it decreases to 60 mm after natural aging for 50 d followed by artificial peak aging treatment with the corresponding average cooling rates in quench sensitive temperature range (420-230 degrees C) increasing from 1.55 degrees C.s(-1) to 1.95 degrees C.s(-1), indicating worse hardenability and more quench sensitivity after artificial peak aging treatment. During water-spray quenching, the precipitates form firstly on grain/subgrain boundaries and then at some special positions in matrix, such as Al3Zr particles. The inhomogeneous precipitates on grain/subgrain boundaries are observed at a location of 3 mm from the quenching surface with the corresponding average cooling rate of 981 degrees C.s(-1). While inhomogeneous precipitates in matrix are observed at a location of 10 mm from the quenching surface with the corresponding average cooling rate of 37.75 degrees C.s(-1). Properties of the alloy at 25 mm from the quenching surface have little changed compared with those on the quenching surface and the corresponding average cooling rate at the location of 25 mm is 9.34 degrees C.s(-1) which is much smaller than that on the quenching surface. Therefore, during the spray quenching process, the average cooling rate of 7B50 alloy thick plates should be controlled to be close to but not less than 9.34 degrees C.s(-1), in order to get excellent and uniform properties after quenching and aging.
KeywordQUENCH-SENSITIVITY MICROSTRUCTURE PRECIPITATION BEHAVIOR ZONES 7B50 aluminum alloy water-spray quenching hardenability cooling rate microstructure
Indexed ByCSCD
Language英语
CSCD IDCSCD:6412136
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/154861
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.University Quebec Chicoutimi, Chicoutimi, PQ G7H 2B1, Canada
Recommended Citation
GB/T 7714
Kang Lei,Zhao Gang,Liu Kung,et al. Hardenability and Critical Average Cooling Rates of 7B50 Aluminum Alloy[J]. RARE METAL MATERIALS AND ENGINEERING,2019,48(1):309-316.
APA Kang Lei,Zhao Gang,Liu Kung,&Tian Ni.(2019).Hardenability and Critical Average Cooling Rates of 7B50 Aluminum Alloy.RARE METAL MATERIALS AND ENGINEERING,48(1),309-316.
MLA Kang Lei,et al."Hardenability and Critical Average Cooling Rates of 7B50 Aluminum Alloy".RARE METAL MATERIALS AND ENGINEERING 48.1(2019):309-316.
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