Acta Metall Sin  1997, Vol. 33 Issue (9): 921-926    DOI:

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COMPENSATION OF SOLIDIFICATION CONTRACTION AND HOT CRACKING TENDENCY OF ALLOYS

DING Hao(Xi'an Jiaotong University; Xi'an 710049); FU Hengzhi;LIU Zhonguan (Northwestern Polytechnical University. Xi'an 710072); CHEN Rongzhang; LIUBocao;ZHONG Zhengung;TANG Dingzhong(Beijing Institute of Aeronautical Materials; Beijing 100095)

DING Hao(Xi'an Jiaotong University; Xi'an 710049); FU Hengzhi;LIU Zhonguan (Northwestern Polytechnical University. Xi'an 710072); CHEN Rongzhang; LIUBocao;ZHONG Zhengung;TANG Dingzhong(Beijing Institute of Aeronautical Materials; Beijing 100095). COMPENSATION OF SOLIDIFICATION CONTRACTION AND HOT CRACKING TENDENCY OF ALLOYS. Acta Metall Sin, 1997, 33(9): 921-926.

Abstract References Related Articles Recommended Metrics Download:  PDF(1188KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Based on analysis to previous research on hot cracking of alloys, a hot cracking model formed through solidification contraction and compensation was proposed. In this model, solidification process of alloy was divided to four stages, quasi-liquid phase stage,compensated stage, uncompensated stage and dendritic bridging stage. Hot cracks started in uncompensated stage. The contraction of inter-dendritic liquid caused cavities between dendrites, then the dendritic bridges broken and hot cracks formed. Fraction range of liquid in uncompensated stage is calculated to be 0.83%-26% and 0.31-9.3% for alloys with equiaxial and columnar grains respectively. The temperature range of uncompensated stage for Al-Si and Al-Cu alloys was calculated. Comparison between theoretical calculation and hot cracking experiments showed that hot cracking tendency of alloys increases with the increase of temperature range of uncompensated stage. The dendritic bridges were first discovered in hot cracks of directionally solidified alloys. The tracks caused by dendritic bridges breaking were also discovered on the section of hot cracks. Key words:  hot cracking      solidification      uncompensated stage      dendritic bridge      Received:  18 September 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I9/921 1Borland J C.Weld Met Fabr,1979(3):99 2Clyne T W,Davies G J Br Foundryman,1981;7465 31991;(6):69 4丁浩,傅恒志罗栓柱,刘忠元,张克福金属学报,1995;31A:376 5Wisser P F.AFS Trans,1983;91:647 6Kurz W,Fisher D J著,毛协民,包冠乾译凝固原理.西安:西北工业大学出版社,1987:234 7Singer A R E,Cottrell S A.J Inst Met,1946;73:33 8Lees D C G.J Inst Met,1946;72:343 [1] ZHANG Jian, WANG Li, XIE Guang, WANG Dong, SHEN Jian, LU Yuzhang, HUANG Yaqi, LI Yawei. Recent Progress in Research and Development of Nickel-Based Single Crystal Superalloys[J]. 金属学报, 2023, 59(9): 1109-1124. [2] MA Dexin, ZHAO Yunxing, XU Weitai, WANG Fu. Effect of Gravity on Directionally Solidified Structure of Superalloys[J]. 金属学报, 2023, 59(9): 1279-1290. 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