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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Carbide Precipitation in 2.25 Cr-1 Mo Bainitic Steel: Effect of Heating and Isothermal Tempering Conditions
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Carbide Precipitation in 2.25 Cr-1 Mo Bainitic Steel: Effect of Heating and Isothermal Tempering Conditions

机译：2.25 CR-1 Mo Bainitic Steol的硬质合金降水：加热和等温锻炼条件的影响

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摘要

The effect of the tempering heat treatment, including heating prior to the isothermal step, on carbide precipitation has been determined in a 2.25 Cr-1 Mo bainitic steel for thick-walled applications. The carbides were identified using their amount of metallic elements, morphology, nucleation sites, and diffraction patterns. The evolution of carbide phase fraction, morphology, and composition was investigated using transmission electron microscopy, X-ray diffraction, as well as thermodynamic calculations. Upon heating, retained austenite into the as-quenched material decomposes into ferrite and cementite. M7C3 carbides then nucleate at the interface between the cementite and the matrix, triggering the dissolution of cementite. M2C carbides precipitate separately within the bainitic laths during slow heating. M23C6 carbides precipitate at the interfaces (lath boundaries or prior austenite grain boundaries) and grow by attracting nearby chromium atoms, which results in the dissolution of M7C3 and, depending on the temperature, coarsening, or dissolution of M2C carbides, respectively. (C) The Minerals, Metals & Materials Society and ASM International 2017
机译：回火热处理的影响，包括在等温步骤之前加热，在2.25CR-1 Mo Bainitic Stupition钢中测定厚壁应用。使用它们的金属元素，形态，成核位点和衍射图案鉴定碳化物。使用透射电子显微镜，X射线衍射以及热力学计算研究了碳化物相级分，形态和组合物的演变。加热后，保留奥氏体进入淬火材料中分解成铁氧体和渗碳岩。然后，M7C3碳化物在渗碳石和基质之间的界面处成核，引发渗透石的溶解。在缓慢加热期间，M2C碳化物分别在贝氏体板内分别沉淀。 M23C6碳化物在界面（Lath边界或先前奥氏体晶晶晶界）处沉淀出来并通过吸引附近的铬原子而生长，这导致M7C3的溶解，并且根据M2C碳化物的温度，粗化或溶解。 （c）2017年矿物质，金属和材料协会和ASM国际

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