[1]王兆华,谢章龙,陈锋.亚温淬火及回火工艺对E550级船板钢组织和性能的影响[J].东南大学学报(自然科学版),2018,48(4):613-618.[doi:10.3969/j.issn.1001-0505.2018.04.005]
 Wang Zhaohua,Xie Zhanglong,Chen Feng.Effects of intercritical quenching and tempering process on microstructure and properties of ship plate steel with 550 MPa strength grade[J].Journal of Southeast University (Natural Science Edition),2018,48(4):613-618.[doi:10.3969/j.issn.1001-0505.2018.04.005]
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亚温淬火及回火工艺对E550级船板钢组织和性能的影响()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
48
期数:
2018年第4期
页码:
613-618
栏目:
材料科学与工程
出版日期:
2018-07-20

文章信息/Info

Title:
Effects of intercritical quenching and tempering process on microstructure and properties of ship plate steel with 550 MPa strength grade
作者:
王兆华1谢章龙2陈锋1
1东南大学江苏省先进金属材料高技术研究重点实验室, 南京 211189; 2南京钢铁股份有限公司, 南京 210035
Author(s):
Wang Zhaohua1 Xie Zhanglong2 Chen Feng1
1 Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China
2 Nanjing Iron and Steel Co., Ltd., Nanjing 210035, China
关键词:
船板钢 亚温淬火 回火温度 显微组织 力学性能
Keywords:
ship plate steel intercritical quenching tempering temperature microstructure mechanical property
分类号:
TG142.1
DOI:
10.3969/j.issn.1001-0505.2018.04.005
摘要:
以E550级超高强度船板钢为研究对象,采用SEM,TEM分析和力学性能测试等手段,研究了亚温淬火时宽回火温度范围内微观组织和力学性能的演变规律.研究结果表明,试验钢在820 ℃淬火后由板条马氏体和18.8%体积分数的准多边形铁素体组成.随回火温度升高,马氏体板条逐渐分解转变为回火屈氏体和回火索氏体,其中Fe3C由薄片状转变为球状,并不断粗化;铁素体板条的位错密度下降,最终再结晶成为等轴晶粒.上述变化导致材料强度下降,伸长率和低温韧性提高.试验钢经820 ℃淬火和440~600 ℃的宽温度范围回火后具有优异的强韧性,力学性能与调质处理(930 ℃淬火和600~670 ℃回火)的试验钢相当,可显著节省热处理工艺成本.
Abstract:
A 550 MPa strength grade ship plate steel was studied. The effects of intercritical quenching and tempering process on the microstructure and properties of the steel were studied by scanning electron microscope(SEM)and transmission electron microscope(TEM)analysis and mechanical tests. Experimental results show that the steel consists of lath martensite and 18.8% volume fraction of quasi-polygonal ferrite after intercritical quenching at 820 ℃. With the increase of tempering temperature, the lath martensite is decomposed to troostite and sorbite gradually, within which the precipitated Fe3C changes from flake to spherical form and coarsens constantly, and the dislocation density in lath ferrite decreases continuously and equiaxed ferrite finally appears due to recrystallization. The above evolutions of the microstructure lead to the decrease in strength and increase in ductility and toughness. The steel quenched at 820 ℃ and then tempered at 440-600 ℃possesses excellent properties equivalent to those of the steel quenched at 930 ℃and tempered at 600-670 ℃. The process in the present study thus gives a feasible way to remarkably reduce the cost of heat treatment.

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备注/Memo

备注/Memo:
收稿日期: 2017-12-13.
作者简介: 王兆华(1992—),男,硕士生;陈锋(联系人),男,博士,教授,博士生导师,101001767@seu.edu.cn.
引用本文: 王兆华,谢章龙,陈锋.亚温淬火及回火工艺对E550级船板钢组织和性能的影响[J].东南大学学报(自然科学版),2018,48(4):613-618. DOI:10.3969/j.issn.1001-0505.2018.04.005.
更新日期/Last Update: 2018-07-20