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Development of high modulus steels based on the Fe – Cr – B system
Materials Science and Engineering: A ( IF 6.1 ) Pub Date : 2018-03-22 , DOI: 10.1016/j.msea.2018.03.082
C. Baron , H. Springer , D. Raabe

We present a novel alloy design strategy for cost-efficient high modulus steels with an increased stiffness / mass density ratio. The concept is based on the liquid metallurgy synthesis of Fe – Cr – B based alloys, straightforward processability, and well tuneable mechanical properties via plain heat treatments. The base alloy Fe – 18 Cr – 1.6 B (wt%) contained 14–17 vol% of (Cr,Fe)2B particles of ellipsoidal morphology in a ferritic matrix. Hot rolled materials revealed a specific modulus of 32.8 GPa g−1 cm3, exceeding that of conventional Fe-Cr steels by almost 30%. Mechanical properties obtained are comparable to TiB2 based high modulus steels. Addition of 1 wt% Cu to the base alloy did not interact with the formation, fraction, size and morphology of (Cr,Fe)2B particles, and allowed to mildly increase the strength values by ageing treatments, however at the price of a reduction of the specific modulus. C additions of 0.2 wt% did not affect the (Cr,Fe)2B particle microstructure greatly, but free C dissolved in the matrix enables for the first time to utilize the wide range of microstructures and mechanical properties of established C-containing high strength steels also in high modulus steels.



中文翻译:

基于Fe-Cr-B系统的高模量钢的开发。

我们提出了一种具有成本效益的高模量钢,具有增加的刚度/质量密度比的新型合金设计策略。该概念基于Fe-Cr-B基合金的液相冶金合成,直接的可加工性以及通过普通热处理而具有良好可调节的机械性能。基本合金Fe – 18 Cr – 1.6 B(wt%)在铁素体基体中包含14–17 vol%的椭圆形的(Cr,Fe)2 B颗粒。热轧材料的比模量为32.8 GPa g -1 cm 3,比传统的Fe-Cr钢高约30%。获得的机械性能与TiB 2相当基高模量钢。向基础合金中添加1 wt%的Cu不会与(Cr,Fe)2 B颗粒的形成,分数,尺寸和形态发生相互作用,并且允许通过时效处理温和地提高强度值,但是价格是1%。降低比模量。添加0.2 wt%的C不会显着影响(Cr,Fe)2 B颗粒的微观结构,但是溶解在基质中的游离C能够首次利用广泛的微观结构和已建立的含C高强度的机械性能。高模量钢中也使用这种钢。

更新日期:2018-03-22
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