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In situ neutron diffraction in quantifying deformation behaviors of nano- sized carbide strengthened UFG ferritic steel

机译：原位中子衍射定量量化纳米碳化物增强UFG铁素体钢的变形行为

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摘要

The microstructures and mechanical properties of a low-alloy medium-carbon steel with a duplex microstructure composed of nanoscale spheroidized carbides in ultrafine-grained (UFG) ferritic steel are examined. The average grain size of the studied steel is similar to 430 nm, and these grains coexist with numerous carbides. Neutron diffraction reveals that the intensity of (011) and (022) peaks for the UFG sample is significantly enhanced, suggesting that the (011)//RD texture is a result of the warm rolling process. The lattice parameter of UFG steel is smaller than that of a martensitic steel (M steel) counterpart, indicating a lower carbon concentration in the lattice. The estimated dislocation densities for M steel and UFG steel are 2.59 x 10(14) cm(-2) and 1.76 x 10(12) cm(-2), respectively. The UFG steel reveals a nearly isotropic lattice strain response under initial tension from 0 to 450 MPa, where the lattice strains of the (110), (002), and (112) planes are identical. The increase of lattice strain of the (110) plane becomes smaller than that of the (002) and (112) planes as the stress exceeds 450 MPa, suggesting that the nanosized carbides contribute to the hardening ability by promoting the accumulation of geometrically necessary dislocations around the particles, and the (110) lattice becomes harder compared to the other two planes.
机译：研究了超细晶粒（UFG）铁素体钢中具有纳米级球状碳化物双相组织的低合金中碳钢的组织和力学性能。所研究的钢的平均晶粒尺寸类似于430 nm，并且这些晶粒与许多碳化物共存。中子衍射表明，UFG样品的（011）和（022）峰的强度显着增强，表明（011）// RD织构是热轧过程的结果。 UFG钢的晶格参数小于马氏体钢（M钢）的晶格参数，表明晶格中的碳浓度较低。 M钢和UFG钢的估计位错密度分别为2.59 x 10（14）cm（-2）和1.76 x 10（12）cm（-2）。 UFG钢在0到450 MPa的初始张力下显示出几乎各向同性的晶格应变响应，其中（110），（002）和（112）平面的晶格应变相同。当应力超过450 MPa时（110）面的晶格应变的增加变得小于（002）和（112）面的晶格应变的增加，这表明纳米尺寸的碳化物通过促进几何上必要的位错的积累而有助于硬化能力。与其他两个平面相比，（110）晶格变得更硬。

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