Effect of Ta and Ti on Modified Reduced Activation Ferritic/Martensitic Steels with a Thermo‐mechanical Control Process,Steel Research International

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Effect of Ta and Ti on Modified Reduced Activation Ferritic/Martensitic Steels with a Thermo‐mechanical Control Process
Steel Research International ( IF 1.9 ) Pub Date : 2020-10-28 , DOI: 10.1002/srin.202000477
Kaiyu Zhu ₁ , Tianyu Zhang ₁ , Qing Cui ₁ , Chenchong Wang ₁ , Wei Xu ₁

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Modified reduced activation ferritic/martensitic steels with different amounts of Ta and Ti are fabricated with a thermo‐mechanical control process (TMCP). TMCP greatly enhances the refinement of both the precipitates and the martensite matrix. In addition, an increase in the dislocation density is achieved. The modified steels show excellent comprehensive mechanical properties compared with traditional reduced activation ferritic/martensitic steels. In addition, under the conditions of the TMCP, the effects of Ta and Ti on the microstructure and properties are analyzed. Simply increasing the amounts of Ta and Ti does not increase the phase fraction of MX, which is quite different from that derived from equilibrium thermodynamics theory or the typical hot rolling process for traditional reduced activation ferritic/martensitic steels. Without a high enough nucleation rate for MX, the excess Ta and Ti, which are not consumed by the formation of MX, promotes the formation of proeutectoid ferrite. This decreases the impact on toughness significantly. Herein, preliminary guidance is offered for a comprehensive design with a combination of both composition and rolling processing modification for the production of reduced activation ferritic/martensitic steels.

中文翻译：

Ta和Ti对热力学控制过程中改性还原活化铁素体/马氏体钢的影响

通过热机械控制工艺（TMCP）加工出具有不同Ta和Ti含量的改性还原活化铁素体/马氏体钢。TMCP极大地增强了析出物和马氏体基体的细化。另外，实现了位错密度的增加。与传统的还原活化铁素体/马氏体钢相比，改性钢具有优异的综合机械性能。另外，在TMCP条件下，分析了Ta和Ti对组织和性能的影响。简单地增加Ta和Ti的量并不会增加MX的相分率，这与从平衡热力学理论或传统的还原活化铁素体/马氏体钢的典型热轧工艺推导的相率截然不同。没有足够高的成核速率来形成MX，多余的Ta和Ti不会被MX的形成所消耗，从而促进了共析铁素体的形成。这大大降低了对韧性的影响。在此，为生产还原活化铁素体/马氏体钢的成分和轧制工艺进行了综合设计的初步指导。

更新日期：2020-10-28

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