Effect of Ni Addition on Bainite Transformation and Properties in a 2000 MPa Grade Ultrahigh Strength Bainitic Steel

Junyu Tian; Guang Xu; Zhengyi Jiang; Haijiang Hu; Mingxing Zhou

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자료유형: 학술저널

저자정보: Junyu Tian (Wuhan University of Science and Technology) Guang Xu (Wuhan University of Science and Technology) Zhengyi Jiang (University of Wollongong) Haijiang Hu (Wuhan University of Science and Technology) Mingxing Zhou (Wuhan University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.6

발행연도: 2018.1

수록면: 1,202 - 1,212 (11page)

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The effects of Nickle (Ni) addition on bainitic transformation and property of ultrahigh strength bainitic steels are investigatedby three austempering processes. The results indicate that Ni addition hinders the isothermal bainite transformation kinetics,and decreases the volume fraction of bainite due to the decrease of chemical driving force for nucleation and growth ofbainite transformation. Moreover, the product of tensile strength and total elongation (PSE) of high carbon bainitic steelsdecreases with Ni addition at higher austempering temperatures (220 and 250 °C), while it shows no significant differenceat lower austempering temperature (200 °C). For the same steel (Ni-free or Ni-added steel), the amounts of bainite and RAfirstly increase and then decrease with the increase of the austempering temperature, resulting in the highest PSE in thesample austempered at temperature of 220 °C. In addition, the effects of austempering time on bainite amount and propertyof high carbon bainitic steels are also analyzed. It indicates that in a given transformation time range of 30 h, more volumeof bainite and better mechanical property in high carbon bainitic steels can be obtained by increasing the isothermal transformationtime.

참고문헌 (2)

참고문헌 신청

Lixin Li / 2018 / Metadynamic and Static Recrystallization Softening Behavior of a Bainite Steel / Metals and Materials International 24(1):60~66

Hai-jiang Hu / 2015 / Effect of Ausforming on the Stability of Retained Austenite in a C-Mn-Si Bainitic Steel / Metals and Materials International 21(5):929~935

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