快速加热回火对690 MPa级海洋工程用钢组织和性能的影响

张杰; 蔡庆伍; 武会宾; 樊艳秋

doi:10.3724/SP.J.1037.2013.00290

金属学报 >

2013 , Vol. 49 >Issue 12: 1549 - 1557

DOI: https://doi.org/10.3724/SP.J.1037.2013.00290

论文

快速加热回火对690 MPa级海洋工程用钢组织和性能的影响

张杰 ,
蔡庆伍 ,
武会宾 ,
樊艳秋

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1) 北京航空制造工程研究所, 北京100024
2) 北京科技大学冶金工程研究院, 北京100083
3) 首钢技术研究院, 北京 100043

张杰, 男, 1981年出生, 工程师

收稿日期: 2013-05-28

修回日期: 2013-10-09

网络出版日期: 2013-12-11

基金资助

国家高技术研究发展计划资助项目2012AA03A508

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EFFECT OF TEMPERING TEMPERATURE ON MICRO-STRUCTURE AND PROPERTY OF 690 MPa GRADE OCEAN ENGINEERING STEEL UNDER FAST HEATING RATE

ZHANG Jie ,
CAI Qingwu ,
WU Huibin ,
FAN Yanqiu

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1) Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024
2) Research Institute of Metallurgy Engineering, University of Science and Technology Beijing, Beijing 100083
3) Technical Research Institute of Shougang, Beijing 100043

Received date: 2013-05-28

Revised date: 2013-10-09

Online published: 2013-12-11

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摘要

设计一种以低碳贝氏体组织为特征的690 MPa级海洋工程用钢,使用感应加热炉对直接淬火态钢板进行快速加热回火,通过拉伸实验、SEM和TEM手段研究了不同回火温度对其组织和性能的影响. 结果表明, 钢材的性能,特别是强韧性匹配受未转变奥氏体的转变行为以及析出物状态的综合影响.快速加热至550℃进行回火, 组织软化, 晶内只有少量析出物出现,致使强度降低, 未转变奥氏体在冷却过程中转变为马氏体/奥氏体(M/A)岛; 快速加热到600℃,由未转变奥氏体转化成的M/A岛尺寸稍有减小, 细小的Cu, Nb/Ti复合析出物大量出现,钢材的强度显著上升; 快速升温到660℃, 组织内部析出物发生粗化,强度稍有下降, 未转变奥氏体在板条间生成残余奥氏体薄膜, 使得韧性提高,强韧匹配最佳; 快速升温到700℃进行回火, 析出物进一步粗化,未转变奥氏体进一步长大在室温下转变为尺寸较大的M/A岛, 韧性再次下降,强韧性匹配降低. 综合考虑, 采用600—660℃的快速加热回火工艺可以使钢材达到最佳的强韧性匹配.

关键词： 加热速率; 回火温度; 海洋工程; 未转变奥氏体; 析出物

本文引用格式

张杰 , 蔡庆伍 , 武会宾 , 樊艳秋 . 快速加热回火对690 MPa级海洋工程用钢组织和性能的影响[J]. 金属学报, 2013 , 49(12) : 1549 -1557 . DOI: 10.3724/SP.J.1037.2013.00290

Abstract

Ocean engineering steel has been rapidly developed with the exploration of ocean resourses. A 690 MPa grade low carbon bainite steel was designed for ocean engineering, to upgrade performance by microstructure control and the refinement and dispersion control of precipitates. This steel was tempered on--line with rapid heating rate after control rolling and accelerated cooling process. The results show that the mechanical properties, especially the strength--toughness balance, are strongly influenced by the transformation of untransformed austenite and the condition of precipitates. When fast tempering at 550℃, microstructure recovered and few precipitates appeared, bringing strength down seriously, untransformed austenite turned into martensite/austenite (M/A) islands on cooling. When the tempering temperature reached 600℃, the size of the M/A islands transformed from untransformed austenite decreased slightly, Cu and Nb/Ti precipitates increased greatly, bringing an apparent improvement in strength. When tempering temperature reached 660℃, precipitates got coarsened and made the strength decreases, the untransformed austenite formed retained austenite film between the laths, improving toughness and making the best strength—toughness balance. When the tempering temperature reached the top at 700℃, the precipitates got further coarsened, the untransformed austenite on cooling turned into large M/A islands, bringing toughness and the strength—toughness balance down again. In general consideration, fast heating tempering at 600—660℃ could make the steel has the best strength—toughness balance.

Key words： heating rate; tempering temperature; ocean engineering; untransformed austenite; precipitate

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