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首页> 外文期刊>ISIJ international >Effects of the Addition of Cr, Mo and Ni on the Microstructure and Retained Austenite Characteristics of 0.2% C-Si-Mn-Nb Ultrahigh-strength TRIP-aided Bainitic Ferrite Steels
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Effects of the Addition of Cr, Mo and Ni on the Microstructure and Retained Austenite Characteristics of 0.2% C-Si-Mn-Nb Ultrahigh-strength TRIP-aided Bainitic Ferrite Steels

机译：Cr，Mo和Ni的添加对0.2％C-Si-Mn-Nb超高强度TRIP辅助贝氏体铁素体钢组织和残余奥氏体性能的影响

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摘要

Cr, Mo and/or Ni were added to TRIP-aided bainitic ferrite (TBF) steel (0.2% C, 1.5% Si, 1.5% Mn and 0.05% Nb ultrahigh-strength TBF steel) in order to increase its hardenability. In addition, the effects of the alloying elements on the Vickers hardness, microstructure and retained austenite characteristics of the TBF steels were investigated. When the TBF steels were austempered at temperatures between Ms and Mi, the Vickers hardness increased from HV300 to HV430 with increasing hardenability. The microstructure consisted of martensite and bainitic ferrite lath structures and retained austenite phases and the volume fraction of retained austenite increased with increasing hardenability. Conversely, the carbon concentration of the retained austenite decreased with increasing hardenability. Simultaneously, the quantity of the hard blocky martensite phase (M-A constituent) with refined interlath retained austenite films increased with increasing hardenability. These characteristics are mainly caused by the delayed bainite transformation during austempering through the addition of Cr, Mo and/or Ni. The addition of Ni lowered the T_0 line further. The retained austenite phases of Cr- and/or Mo-bearing TBF steels were relatively stable against straining, despite their low carbon concentrations.
机译：Cr，Mo和/或Ni被添加到TRIP辅助的贝氏体铁素体（TBF）钢（0.2％C，1.5％Si，1.5％Mn和0.05％Nb超高强度TBF钢）中，以提高其淬透性。此外，研究了合金元素对TBF钢维氏硬度，显微组织和残余奥氏体特性的影响。当TBF钢在Ms和Mi之间的温度下回火时，维氏硬度从HV300增加到HV430，并增加了淬透性。显微组织由马氏体和贝氏体铁素体板条结构以及残余奥氏体相组成，残余奥氏体的体积分数随淬透性的增加而增加。相反，残余奥氏体的碳浓度随着淬透性的增加而降低。同时，随着淬透性的提高，具有细化层间残留奥氏体膜的硬块状马氏体相（M-A成分）的数量也增加。这些特性主要是由于在奥氏体回火过程中通过添加Cr，Mo和/或Ni导致贝氏体转变延迟所致。 Ni的添加进一步降低了T_0线。 Cr和/或Mo的TBF钢的残余奥氏体相尽管碳含量低，但相对抗应变相对稳定。

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