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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Influence of Warm Tempforming on Microstructure and Mechanical Properties in an Ultrahigh-Strength Medium-Carbon Low-Alloy Steel
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Influence of Warm Tempforming on Microstructure and Mechanical Properties in an Ultrahigh-Strength Medium-Carbon Low-Alloy Steel

机译：温热成形对超高强度中碳低合金钢组织和力学性能的影响

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摘要

A 0.4 pct C-2 pct Si-1 pct Cr-1 pct Mo steel was quenched and tempered at 773 K (500 °C) and deformed by multi-pass caliber rolling (i.e., warm tempforming). The microstructures and the mechanical properties of the warm tempformed steels were investigated as a function of the rolling reduction. At rolling reductions of more than 28 pct, not only extension of the martensite blocks and/or the packets in the rolling direction (RD) but also a grain subdivision became more significant, and an ultrafine elongated grain (UFEG) structure with a strong (110)//RD fiber deformation texture was formed after 78 pct rolling. The tensile deformation behavior became significantly anisotropic in response to the evolution of UFEG structure. The longitudinal yield strength (σ_y) of the quenched and tempered sample increased from 1480 to 1860 MPa through the 78 pct rolling, while the transverse σ_yleveled off at around 1600 MPa up to 28 pct rolling. The transverse true fracture stress was also markedly degraded in contrast to the longitudinal one. Charpy impact properties were enhanced at a rolling reduction of 52 pct or more. The 52 pct-rolled sample underwent a ductile-to-brittle transition in the temperature range from 333 K to 213 K (60 °C to -60 °C), while the 78 pct-rolled sample showed an inverse temperature dependence of the impact toughness because of brittle delamination. The tensile and Charpy impact properties are discussed in association with the microstructural evolution.
机译：将0.4 pct的C-2 pct的Si-1 pct的Cr-1 pct的Mo钢在773 K（500°C）上进行淬火和回火，并通过多道次口径轧制（即温压成型）使其变形。研究了热轧钢的显微组织和力学性能与轧制压下率的关系。轧制压下量超过28 pct时，不仅马氏体块和/或钢包在轧制方向（RD）上的延伸，而且晶粒细化变得更加重要，超细拉长晶粒（UFEG）结构具有很强的（在78pct轧制后形成110）// RD纤维变形织构。响应UFEG结构的演变，拉伸变形行为变得明显各向异性。淬火和回火样品的纵向屈服强度（σ_y）通过78 pct轧制从1480 MPa增加到1860 MPa，而横向σ_y在1600 MPa左右直至28 pct轧制均趋于平稳。与纵向相比，横向真实断裂应力也明显降低。夏比冲击性能在轧制减少52 pct或更多时得到了增强。 52 pct轧制的样品在333 K至213 K（60°C到-60°C）的温度范围内经历了从韧性到脆性的转变，而78 pct轧制的样品显示了冲击的反温度依赖性由于脆性分层而具有韧性。拉伸和夏比冲击性能与微观结构演变有关。

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