Transactions of Materials and Heat Treatment

Title：Forging failure analysis on duplex stainless steel 2205

Authors： Zhang Xiaoxiao Zhao Ziwen Qi Qinghua Wang Yaan Song Daochun Ma Xiaofeng Shi Wei

Unit： Lanzhou LS Energy Equipment Engineering Institute Co. Ltd. Gansu Province Engineering Technology Research Center of High-end Castings and Forgings Lanzhou LS Casting and Forging Co. Ltd. Lanzhou LS Testing Technology Co. Ltd.

KeyWords： duplex stainless steel 2205 forging failure σ-phase aging treatment cracks

ClassificationCode：TG316.2

year,vol(issue):pagenumber：2017,42(8):6-11

Abstract：

The forging failure problem of duplex stainless steel 2205 in actual industrial production was studied. Then, two 4.2 tons steel ingots were poured by 10 t EAF-AOD duplex smelting process, and the chemical composition of ingot was qualified and the surface quality was good. But in the process of forging billet, the ingot surface appeared a lot of lateral cracks resulting in forging products scrapped. Therefore, the defects of duplex stainless steel 2205 during the forging process were studied by means of metallographic microscope, scanning electron microscope and energy dispersive spectrometer. The results show that the reason of forging failure of duplex stainless steel 2205 was that the aging treatment was conducted at 850 ℃ during the heating process before forging, and a large amount of σ brittle phase were precipitated to result in the decrease of plastic toughness of steel and severe cracking of surface by deformation force. Furthermore, duplex stainless steel 2205 should be heated rapidly during the temperature range 600-1000 ℃ in hot working process，and the aging treatment should not be conducted to avoid the σ-phase precipitation worsening the mechanical properties of steel.

Funds：

甘肃省科技计划资助项目（2015GS05896）

张潇潇（1990-），男，硕士，工程师

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