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超细晶贝氏体钢组织的晶界特征和晶粒尺寸
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【全科西医学论文】作者:王志奋,关云, 李平和, 陈庆丰【摘要】 运用 电子 背散射衍射(EBSD) 研究 了弛豫析出控制相变(RPC)技术生产的超细化低碳贝氏体钢回火后组织的变化。结果表明,轧态钢板组织为板条贝氏体,650℃回火后由于析出物钉扎作用贝氏体板条宽度没有明显增大,而700℃回火后贝氏体板条明显粗化。晶界特征结果显示,轧态和回火态组织均存在大量低能量小角度晶界和低Σ值重位点阵(CSL)晶界。 【关键词】 电子背散射衍射; 超低碳贝氏体钢; RPC技术; 回火 Abstract: The effect of tempering on the microstructure of ultralow carbon bainitic (ULCB) steels produced by relaxation precipitation controlled phase transformation (RPC) has been investigated by EBSD. The results showed that the final microstructure mainly contained lathlike bainitic ferrite. On tempering at 650℃ a slight increase was detected in the effective grain size as the straininduced precipitates pinned up the subgrains. After tempering at 700℃, bainitic ferrite laths started to coarsen. The grain boundary characteristics and effective grain size of ULCB steels can be measured by EBSD technique. Key words: EBSD; ultralo
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