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Microstructure and Mechanical Properties of High-Nitrogen Austenitic Stainless Steels Subjected to Equal-Channel Angular Pressing 被引量:5
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作者 Fu-Yuan Dong Peng Zhang +4 位作者 jian-chao pang Qi-Qiang Duan Yi-Bin Ren Ke Yang Zhe-Feng Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2016年第2期140-149,104,共10页
Three high-nitrogen stainless steels with different N contents were successfully processed by equal-channel angular pressing for one pass, and their microstructures and mechanical properties were investigated. It was ... Three high-nitrogen stainless steels with different N contents were successfully processed by equal-channel angular pressing for one pass, and their microstructures and mechanical properties were investigated. It was found that the microstructure of the billet was heterogeneous across the billet thickness, resulting in the difference in the mechanical properties due to the different deformation conditions. A relatively low strength, high uniform elongation, and high work- hardening rate for the samples at the bottom of the billet was achieved in comparison with those processed at the top. Meanwhile, it was observed that the density of deformation twins increased with the content of N; accordingly, the strength and elongation of the alloys increase with the content of N, resulting in a good strength-ductility combination. 展开更多
关键词 High-nitrogen stainless (HNS) steels Equal-channel angular pressing (ECAP) N content TWINNING Strength Ductility
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High-Temperature Oxidation Behavior and Related Mechanism of RuT400 Vermicular Graphite Iron
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作者 Yu Chen jian-chao pang +1 位作者 Shou-xin Li Zhe-feng Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第7期1117-1130,共14页
The vermicular graphite iron is an important material with excellent combination properties for cylinder heads of diesel engines,and the high-temperature oxidation is a crucial problem during service of the component.... The vermicular graphite iron is an important material with excellent combination properties for cylinder heads of diesel engines,and the high-temperature oxidation is a crucial problem during service of the component.In this study,the oxidation experiment of RuT400 vermicular graphite iron was performed at 500 ℃,and the oxidation time was chosen as 100 h,200 h,300 h,400 h,and 500 h,respectively.Meanwhile,the corresponding microstructure evolution,oxidation kinetics,and oxidation mechanism were discussed.It is found that oxidation pores and oxide layer often appear at the vermicular graphite on the specimen surface;the vermicular graphite plays the role of oxidation channel,and it tends to diff use along the adjacent pearlite and then connect with each other to form oxidation bridges as the oxidation time prolongs.A linear relationship between oxidation weight gain and the thickness of the oxide layer was established and verifi ed well.These results will give a more comprehensive understanding on the oxidation mechanism of vermicular graphite iron and provide certain guidance for design and preparation of anti-oxidation cast irons. 展开更多
关键词 Vermicular graphite iron High-temperature oxidation Microstructure evolution Oxidation mechanism
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