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		两步贝氏体转变对中碳微纳结构钢韧性的影响
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			Influence of Two-Step Bainite Transformation on Toughness in Medium-Carbon Micro/Nano-Structured Steel
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| 图4. 中碳钢一步和两步贝氏体转变组织的晶界角度分布 | 
| Fig.4. Grain boundary angular distributions of medium-carbon steel for one-step (a) and two-step (b) bainitic transformations | 
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