T92钢在649℃不同应力蠕变过程中Laves相的析出行为及对强度的影响
Precipitation Behavior of Laves Phase and Its Influence on Strength of T92 Steel during Creep at 649℃ with Different Stresses
摘 要
为了研究T92钢在使用过程中显微组织的变化和Laves相的析出行为及对其强度的影响,进行了649℃、不同应力水平的蠕变试验;采用OM、SEM、TEM等观察了其显微组织和析出相的变化,并测试了硬度的变化.结果表明:热处理后T92钢的基体为具有高密度位错的马氏体组织,钢中大量的析出相为M23C6和MX;蠕变后钢中析出Laves相,其析出方式为一是依附于M23C6析出,二是在晶界单独析出,两种方式析出的Laves相的熟化速率都比M23C6的快;蠕变后钢的硬度(强度)随时间延长逐渐下降,主要原因是钢中析出了laves相造成的.
Laves相
强化
蠕变试验
T92 steel
Laves phase
strengthening
creep test
Abstract
In order to study the microstructure transformation,Laves precipitate behavior and its influence on the strength of T92 steel during service,creep tests were performed at 649℃ with different stress levels.Then use optical microscopy,scanning-electron microscopy and transmission electron microscopy to observe the microstructure and precipitates transformation.the hardness variation was tested.The results show that the microstructure of T92 steel after heat treatment was martensite with dense dislocation and many precipitations including M23C6 and MX precipated in the steel.Laves phase appeared after creep,which precipated as the ways consisted of attaching on M23C6 and along the grain boundaries alone.The rate of ripening of Laves phase was rapider than M23C6.The Vickers hardness decreased during creep with the prolongation of the time,which was resulted as precipitation of Laves phase in the steel.
中图分类号 TG142.73
所属栏目 试验研究
基金项目
收稿日期 2009/8/3
修改稿日期 2010/4/14
网络出版日期
作者单位点击查看
备注焦占坡(1981-),男,河北保定人,硕士研究生.
引用该论文: JIAO Zhan-po1,GAO Jia-qiang2,HONG Jie2,ZHANG Lan-ting1,WANG Qi-jiang. Precipitation Behavior of Laves Phase and Its Influence on Strength of T92 Steel during Creep at 649℃ with Different Stresses[J]. Materials for mechancial engineering, 2010, 34(10): 5～8
焦占坡,高加强,洪杰,张澜庭,王起江. T92钢在649℃不同应力蠕变过程中Laves相的析出行为及对强度的影响[J]. 机械工程材料, 2010, 34(10): 5～8
被引情况:
【1】郭晓峰,巩建鸣,姜勇, "650 ℃等温时效过程中P92钢沉淀相的转变规律",机械工程材料 39, 41-43(2015)
【2】窦洪,王志武,宋涛, "服役10500h后超临界锅炉高温再热器用T92钢管的显微组织",机械工程材料 37, 15-17(2013)
【3】赵雷,乔汉文,梁军,钟群鹏,徐连勇,肖德铭, "焊接参数对T92/S30432异种钢焊接接头室温力学性能的影响",机械工程材料 39, 32-38(2015)
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