中碳贝氏体钢的组织演变

J. Mohapatra, D. S. Kumar, G. Balachandran
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引用次数: 0

摘要

将一种含1.97Mn, 1.34Si, 0.8Cr和0.29Mo (wt. %)的0.38C贝氏体钢在实验室规模感应炉中熔化后进行热锻和退火,在Ac3温度以上和临界温度范围内进行奥氏体化,在350 ~ 500℃之间进行正火或等温回火,得到以贝氏体为主要相的多种组织。在退火条件下,钢表现为针状铁素体和珠光体;在Ac3以上正火条件下,钢表现为贝氏体铁素体,残余奥氏体7%。临界间奥氏体化处理后连续冷却后,钢的组织表现为铁素体、贝氏体和珠光体。在Ac3以上进行奥氏体化,然后在不同温度下进行等温回火,形成由贝氏体铁素体和奥氏体组成的无碳化物贝氏体组织,含量在7% ~ 16%之间。在临界温度下奥氏体化,然后在不同温度下进行等温回火,表现为铁素体、碳化物和珠光体。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructure Evolution in Medium Carbon Bainitic Steel
A 0.38C steel with 1.97Mn, 1.34Si, 0.8Cr and 0.29Mo (wt. %) bainitic steel melted in a lab scale induction furnace was hot forged and subjected to annealing, austenitizing above Ac3 temperature and in the inter critical temperature range were normalized or austempered in the temperature between 350 to 500 oC to get a versatile range of microstructure with bainite as a major phase. In the annealed condition the steel showed acicular ferrite with pearlite and in the normalized condition from above Ac3 temperature, bainitic ferrite with 7% retained austenite. When the steel is continuously cooled post intercritical austenitization treatment, the microstructure showed ferrite, bainite and pearlite. Austenitization above Ac3, followed by austempering at different temperatures resulted in carbide free bainitic microstructure consisting of bainitic ferrite and austenite between 7 and 16%. Austenitization in the inter critical temperature followed by austempering at different temperatures showed ferrite, banitic carbide and pearlite.
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