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一、前言为了改善16MnR钢的低温韧性,我们采用了阶段冷却(先快冷,后空冷)的方法,并对阶段冷却过程中,16MnR组织和性能的变化规律进行了研究。试验结果表明,在阶段冷却过程中,随着第一阶段快冷终止温度的下降,组织状态的变化规律是:块状铁素体,交叉分布针状铁素体,平行排列针状铁素体,直至形成含有贝氏体或马氏体的混合组织。其中以交叉分布针状铁素体组织的低温韧性为最佳。同时,试验结果还表明,针状铁素体组织及性能,对阶段
I. INTRODUCTION In order to improve the low temperature toughness of 16MnR steel, we adopted the method of stage cooling (rapid cooling and post-air cooling), and studied the microstructure and properties of 16MnR during the cooling stage. The results show that during the cooling stage, with the decrease of the termination temperature in the first stage of rapid cooling, the variation of microstructure is as follows: massive ferrite, cross-distributed acicular ferrite, parallel acicular ferrite Until a mixed structure containing bainite or martensite is formed. Among them, the cross-distribution of acicular ferrite low temperature toughness is the best. At the same time, the test results also show that the acicular ferrite microstructure and properties of the stage