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Effect of Indirect Transformation of Retained Austenite During Tempering on the Charpy Impact Toughness of a Low-Alloy Cr-Mo-V steel

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Acta Metallurgica Sinica(English Letters) 2020年第10期33卷 1346-1358页

作者： Yong-Han Li Zhong-Hua Jiang Zhen-Dan Yang Jue-Shun Zhu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China

A modified tempering treatment has been designed in order to avoid the direct transformation of retained austenite(Ar)during tempering of a low-alloy Cr-Mo-V *** of the direct transformation of Ar into ferrite and M23C6 carbides during conventional tempering at 700℃,transformation into aggregate of ferrite and cementite has been forced by a pre-tempering at 455℃ before conventional *** have been performed on specimens quenched with cooling rates 1.5,3 and 12℃/s,providing different types of Ar within the as-quenched *** results show that the tempering modification does not improve the Charpy impact toughness at the highest quenching rate of 12℃/s,where the specimens cannot incur cleavage cracking induced from fine and discontinuous M23C6 carbides along lath *** the lowest quenching rate 1.5℃/s,the Charpy impact toughness can be improved,and the failure is dominated by carbide aggregates,which originate from the decomposed products of blocky *** is because the tempering modification effectively suppresses the formation of coarse M23C6 carbides at interfaces between the carbide aggregate and bainitic matrix,thereby resulting in a relatively homogeneous distribution of M23C6 carbides inside carbide ***,the tempering modification is recommended for large-scale forgings,in which relatively high quenching rates are difficult to achieve.

关键词： bainite steel Retained austenite Impact toughness

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Experimental Study on Explosion Expansion Process of Thin Shell-steel Pipe

Experimental Study on Explosion Expansion Process of Thin Sh...

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2002年安全与科学技术国际会议

作者： ZHANG Qingming ZHAO You ZHANG Baoping CHEN Li & CHEN Yanhai (The National Key Laboratory of Explosion and Safety Science Beijing Institute of Technology Beijing 100081 China)

＜正＞ In this paper, the expansion process, which is driven by the explosion of the powerful explosive, of the thin pipes made from two kinds of material （bainite steel and 50SiMnVB） is observed by the high-speed stripe-camera and impulse x-ray camera. The results show the advantage of the B steel as a kind of new material to shell warhead.

关键词： explosion bainite steel dynamic fracture x-ray camera

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