T91铁素体耐热钢析出相的优化控制

doi:10.3724/SP.J.1037.2013.00178

金属学报

2013, Vol. 49

Issue (9): 1075-1080 DOI: 10.3724/SP.J.1037.2013.00178

论文

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T91铁素体耐热钢析出相的优化控制

张芮辉¹⁾,张弛¹⁾,夏志新²⁾,杨志刚¹⁾

1) 清华大学材料学院先进材料教育部重点实验室, 北京100084
2) 苏州热工研究院, 苏州 215004

OPTIMIZING CONTROL OF PRECIPITATES IN T91 FERRITIC HEAT－RESISTAN STEEL

ZHANG Ruihui¹⁾, ZHANG Chi¹⁾, XIA Zhixin²⁾, YANG Zhigang¹⁾

1) Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering,Tsinghua University, Beijing 100084
2) Suzhou Nuclear Power Research Institute, Suzhou 215004

引用本文:

张芮辉,张弛,夏志新,杨志刚. T91铁素体耐热钢析出相的优化控制[J]. 金属学报, 2013, 49(9): 1075-1080.
ZHANG Ruihui, ZHANG Chi, XIA Zhixin, YANG Zhigang. OPTIMIZING CONTROL OF PRECIPITATES IN T91 FERRITIC HEAT－RESISTAN STEEL[J]. Acta Metall Sin, 2013, 49(9): 1075-1080.

全文: PDF(2084 KB)

摘要:

基于T91钢传统的“正火+回火''热处理制度, 在Thermal－Calc软件热力学计算的辅助下,通过在正火与回火热处理间引入850℃等温处理, 设计了2种新的热处理制度.研究了3种不同热处理制度下T91钢中析出相的尺寸及分布规律.与传统``正火+回火''处理制度相比, 新设计的热处理制度使得钢中M₂₃C₆碳化物的尺寸由350 nm降至250 nm左右,并使MX碳氮化物的数密度有所增加. 通过Thermal－Calc模拟计算,M₂₃C₆碳化物析出相变的驱动力随着C含量的降低而增加.利用经典晶界形核理论并结合Thermal－Calc计算结果,定量描述了M₂₃C₆碳化物形核率与C含量的关系,较好地解释了M₂₃C₆碳化物的细化原因.

关键词 ： T91钢, 析出相, M₂₃C₆, 形核率

Abstract：

T91 steel is one representative of (9%－12%)Cr (mass fraction) ferritic heat－resistant steel, in which MX carbonitrides and M₂₃C₆ carbides are two major strengthened precipitates for long－term creep under high temperature. This work attempted to control the precipitation of MX carbonitrides and M₂₃C₆ carbides by applying new heat treatment procedures. With the assist of Thermal－Calc software calculation, two new heat treatment procedures have been designed for T91 steel based on its traditional normalized－tempered treatment, in which an isothermal treatment at 850℃ was introduced between normalized treatment and tempered treatment. The mean size of M₂₃C₆ carbides decreased from 350 nm to 250 nm and the number density of MX carbonitrides increased due to the new heat treatment procedures. The calculated results of Thermal－Calc software showed that the nucleation rate of M₂₃C₆ carbides at 750℃ increased with the decrease of carbon content in the matrix, which might be the major reason why the mean size of M₂₃C₆ carbides decreased.

Key words： T91 steel precipitate M₂₃C₆ nucleation rate

收稿日期: 2013-04-09

基金资助:

国家重点基础研究发展计划项目2011GB108006和国家自然科学基金项目51071090资助

作者简介: 张芮辉, 男, 1988年生, 硕士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00178 或 https://www.ams.org.cn/CN/Y2013/V49/I9/1075

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