Transactions of Materials and Heat Treatment

Title：Failure analysis and process improvement on discharge tank of slurry pump for AISI8630 steel

Authors： Qi Qinghua Liu Jia Cao Kun Li Guozhou Han Wenke Yang Desheng

Unit： Lan Zhou LS Energy Equipment Engineering Institute Co. Ltd. Engineering Research Center for Highend Castings and Forgings in Gansu Province Lan Zhou LS Heavy Equipment Co. Ltd.

KeyWords： AISI8630 steel discharge tank of slurry pump crack flake defect inclusions

ClassificationCode：TG314.4

year,vol(issue):pagenumber：2020,45(3):185-189

Abstract：

The forging failure problem of AISI8630 steel forgings in actual production was studied. The metallurgical process flow of AISI8630 steel ingot was EAFLFVDcasting ingot. The ingot was forged into slurry pump forgings, and the density defects were found by ultrasonic examination after heat treatment. The defects were studied by chemical analysis and macro-analysis and metallographic microscopic analysis. The results show that there are many micro cracks and obvious flake defect on crack fracture in tested surface by macroscopical examination. Gray sulphide inclusions near the cracks and obvious tissue segregation exists, but there is no obvious difference in microstructure away from the crack. The qualified forgings are obtained and the flake defect are avoided throught strictly controlling of the metallurgical process，optimization on the process of dehydrogenation, destress annealing of ingot and cooling treatment below 250 ℃ after forging.

Funds：

甘肃省科技计划资助项目（2015GS05896）

祁庆花（1985-），女，硕士，工程师 E-mail：qiqinghua_118@163.com

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