表面纳米化对低活化钢的组织及其热稳定性的影响

柳文波; 张弛; 杨志刚; 夏志新; 高古辉; 翁宇庆

doi:10.3724/SP.J.1037.2012.00742

金属学报 >

2013 , Vol. 49 >Issue 6: 707 - 716

DOI: https://doi.org/10.3724/SP.J.1037.2012.00742

论文

表面纳米化对低活化钢的组织及其热稳定性的影响

柳文波 ,
张弛 ,
杨志刚 ,
夏志新 ,
高古辉 ,
翁宇庆

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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)苏州热工研究院有限公司, 苏州 215004
3)中国金属学会, 北京 100711

柳文波, 男, 1984年生, 博士生

收稿日期: 2012-12-18

修回日期: 2013-03-25

网络出版日期: 2013-06-11

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

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EFFECT OF SURFACE NANOCRYSTALLIZATION ON MICROSTRUCTURE AND THERMAL STABILITY OF REDUCED ACTIVATION STEEL

LIU Wenbo ,
ZHANG Chi ,
YANG Zhigang ,
XIA Zhixin ,
GAO Guhui ,
WENG Yuqing

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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
3) The Chinese Society for Metals, Beijing 100711

Received date: 2012-12-18

Revised date: 2013-03-25

Online published: 2013-06-11

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摘要

通过表面机械研磨处理(SMAT)在低活化铁素体钢的表面形成了一层纳米晶.TEM和XRD结果显示, SMAT后的表层组织为纳米晶. 550℃的回火实验结果显示,SMAT后的纳米晶具有良好的热稳定性; 回火120 min后的晶粒异常长大,回火240 min后的晶粒比较均匀(约250 nm). SMAT后试样表层碳化物的衍射峰变宽变弱,表明SMAT过程中碳化物被细化, HRTEM观察显示SMAT后的表层组织中存在细小的MC类型碳化物;根据XRD结果, 计算了M₂₃C₆和MC碳化物的晶格常数分别为1.0631和0.4306 nm.由于测试机理和测量深度不同以及纳米组织的尺寸随着深度变化, 利用XRD和TEM检测的晶粒尺寸不同,而TEM照片能更准确地反应晶粒的实际尺寸.

关键词： 表面纳米化; 热稳定性; 低活化钢; 碳化物分解

本文引用格式

柳文波 , 张弛 , 杨志刚 , 夏志新 , 高古辉 , 翁宇庆 . 表面纳米化对低活化钢的组织及其热稳定性的影响[J]. 金属学报, 2013 , 49(6) : 707 -716 . DOI: 10.3724/SP.J.1037.2012.00742

Abstract

Nanocrystalline grains in the surface of reduced activation ferrite/martensite(RAFM) steel were produced by means of surface mechanical attrition treatment (SMAT). Analysis results of XRD and TEM showed that grains after SMAT were nanocrystalline. Experiment results after annealing at 550℃ showed that the nanocrystallines were stable. Abnormal grain growth was observed from the TEM images after tempered for 120 min, and the grain sizes became uniform after tempered for 240 min (about 250 nm). The XRD diffraction peaks of carbides became weaker and boarder indicated that carbides in the surface layer became smaller after SMAT, and smaller MC type carbides were found from HRTEM images after SMAT. The lattice parameters of M₂₃C₆ and MC were 1.0631 and 0.4306 nm calculated from the XRD results. The differences of grain sizes obtained by XRD and TEM could be attributed to the different testing mechanism, different measuring depths and the depth-dependent nanocrystalline microstructure, and results obtained by TEM were more accurate to reveal the real grain size.

Key words： surface nanocrystallization; thermal stability; reduced activation steel,; carbide decomposition

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