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本文根据12CrNi3钢中形成粒状贝氏体的试验结果,研究了粒状贝氏体的形成条件、显微组织形态、岛内的精细结构及其影响因素。在试验基础上讨论了粒状贝氏体的形该机理。12CrNi3钢在较宽范围的冷却速度和等温温度下均可形成粒状贝氏体组织。粒状贝氏体可分为块型和条束型两种。奥氏体化温度愈高,冷速愈大,等温温度愈低,愈有利于条束型粒状贝氏体形成。粒状贝氏体岛内组织可以是奥氏体(A)、马氏体(M)+奥氏体(A)或其它中温转变产物。岛内的M可分别是位错型M与孪晶型M,两种类型M也可同时存在。本文从等温冷却试验结果支持粒状贝氏体的形成机理的溶合模型说。
Based on the experimental results of the formation of granular bainite in 12CrNi3 steel, the formation conditions of granular bainite, the microstructure, the fine structure in the island and its influencing factors were studied. Based on the experiment, the mechanism of granular bainite shape was discussed. 12CrNi3 steel can form granular bainite structure over a wide range of cooling rates and isothermal temperatures. Granular bainite can be divided into two types of block and beam. The higher the austenitizing temperature, the greater the cooling rate. The lower the isothermal temperature, the more conducive to the formation of banded granular bainite. The granular bainite island tissue can be austenite (A), martensite (M) + austenite (A) or other mesothermal transition products. M in the island can be dislocation M and twin M, respectively, and two types M can exist simultaneously. This article says that the isothermal cooling test results support the fusion model of the formation mechanism of granular bainite.