Impacts of Warm Equal‐Channel Angular Pressing on Microstructure and Mechanical Properties of Granular Pearlitic Steel,Steel Research International

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Impacts of Warm Equal‐Channel Angular Pressing on Microstructure and Mechanical Properties of Granular Pearlitic Steel
Steel Research International ( IF 1.9 ) Pub Date : 2020-11-17 , DOI: 10.1002/srin.202000496
Yong Li ₁ , Yi Xiong ₂ , Tian Zhou ₂ , Harishchandra Singh ₃ , Jukka Kömi ₄ , Marko Huttula _{2,

3}

Affiliation

Equal‐channel angular pressing (ECAP) of granular pearlite high‐carbon steel at 650 °C via the Bc route is thoroughly investigated. Together with microstructural evolution investigated through scanning and transmission electron microscopies, microtensile and microhardness testing are conducted for their mechanical properties. After four passes of warm deformation, the formed ultra‐microduplex structure is found to contain both ferrite grains of size ≈0.45 μm and cementite particles with the diameter of ≈0.3 μm. The corresponding microhardness and tensile strength are observed to increase first, followed by a decrement with the number of deformations passes. Meanwhile, yield strength and yield ratio increase with the ECAP passes, along with a slight decrease in elongation. The fracture morphology also changes from many deep dimples before ECAP to many small dimples after ECAP application, denoting a typical ductile fracture of the pearlitic steel.

中文翻译：

等温角挤压对珠光体珠光体钢组织和力学性能的影响

彻底研究了通过Bc路径在650°C下对珠光体珠光体高碳钢的等通道角挤压（ECAP）。结合通过扫描和透射电子显微镜研究的微观结构演变，对它们的机械性能进行了显微拉伸和显微硬度测试。经过四次热变形后，发现形成的超微双相结构既包含尺寸约为0.45μm的铁素体晶粒，又包含直径约为0.3μm的渗碳体颗粒。观察到相应的显微硬度和抗拉强度首先增加，然后随着变形次数的增加而降低。同时，屈服强度和屈服比随ECAP的增加而增加，而伸长率则略有下降。

更新日期：2020-11-17

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