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Static recrystallization behavior of a martensitic heat-resistant stainless steel 403Nb

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Acta Metallurgica Sinica(English Letters) 2011年第5期24卷 381-389页

作者： Zhouyu ZENG Liqing CHEN fuxian zhu Xianghua LIU State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China

A static recrystallization behavior between the roiling passes of a martensitic heatresistant stainless steel 403Nb has been studied by OM, TEM and double-hit thermomechanical simulator to explore the effects of deformation temperature, strain rate, strain and the prior austenite grain size. The results show that increases of deformation temperature and strain rate and strain can promote the static recrystallization of 403Nb steel. Static recrystallization also proceeds faster when the prior austenite grain size is smaller. Microstructural observation indicates that the volume fraction of static recrystallization increases with prolonged interval of the rolling passes. Straininduced precipitation can lead to an appearance of a platform in the kinetic curve of static recrystallization. Different from the conventional micro-alloying steel, the strain-induced precipitates in 403Nb steel during hot rolling are carbides containing Nb and Cr.

关键词： 403Nb Static recrystallization Microstructural evolution Strain-induced precipitation

Effect of Cooling History on Yield Ratio of Fine-grain Ferrite/Pearlite Steel

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Journal of Materials Science & Technology 2005年第6期21卷 791-794页

作者： fuxian zhu Xin LI Yanchun LIU Xianghua LIU Guangfu SHE Zhongping ZHANG State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China Panzhihua Steel Group Co. Ltd Panzhihua 617067 China

Effect of different cooling history on yield ratio of HP295 steel for welded gas cylinder was studied and the result implied that both fine microstructure and good mechanical properties can be attained by using two-stage cooling and controlling the coiling temperature. The yield ratio of HP295 steel sheet was reduced to less than 0.8 by twostage cooling process. The pass percent of yield ratio was enhanced from less than 90% to 100%. The mechanical properties satisfied the criteria of GB6653-1994.

关键词： HP295 steel sheet Yield ratio Two-stage cooling Coiling temperature

Effects of Quenching Process on Mechanical Properties and Microstructure of High Strength Steel

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Journal of Wuhan University of Technology(Materials Science) 2012年第6期27卷 1024-1028页

作者：段争涛 LI Yanmei ZHANG Mingya SHI Minghan zhu fuxian ZHANG Shunhu State Key Laboratory of Rolling and Automation Northeastern University

The effects of direct quenching and tempering （DQ-T） process and conventional reheat quenching and tempering （RQ-T） processes on mechanical properties and microstructure of high strength steel were investigated. The DQ process was found to enhance the hardenability of steel effectively. The tensile strength and yield strength of DQ specimen was 975 MPa and 925 MPa respectively, which were higher than those of RQ specimen＇s of 920 MPa and 871 MPa. In contrast, low temperature toughness （-40 ℃, AKV） of DQ-T specimen （124 J） was generally inferior to that of RQ-T specimen （156 J）. The direct quenching temperature was one of the potential process parameters to determine strength/toughness balance of steel manufactured by DQ process. The experimental results showed that excellent strength/toughness balance was obtained when the specimens was quenched at temperature in the range of 850-910 ℃. The yield strength and impact energy （-40 ℃） of DQ steel decreased significantly with increasing of quenching temperature, although the tensile strength was nearly stable.

关键词： direct quenching reheat quenching mechanical properties microstructure

Development and formability analysis of TRIP seamless steel tube

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Engineering Sciences 2014年第3期12卷 36-42页

作者： Zhang Zicheng zhu fuxian Modern Design and Analysis Institute School of Mechanical Engineering and Automation NortheasternUniversity Shenyang 110819 China State Key Laboratory of Rolling and Automation NortheasternUniversity Shenyang 110819 China

In this paper, the production technology of transformation induced plasticity （TRIP） steel was first introduced into the steel tube manufacture field to produce the steel tubes with high strength and plasticity. The TRIP seamless steel tubes with the microstructure of ferrite, bainite, retained austenite and a little martensite were successfully fabricated using a cold-drawn steel tube with two-stage heat treatment technique and continu- ous heat treatment process, respectively. The ring tensile test and cold bend test were carried out to study the formability of the newly developed TRIP seamless steel tube. The results showed that the TRIP seamless steel tubes have a good cold formability, and they are available to be used in the tube hydroforming process. In ad- dition, the equipment of continuous heat treatment developed in the current study can be used to produce TRIP steel tube, and it may serve as an important reference for the industrial production of TRIP steel tube.

关键词： TRIP steel heat treatment formability steel tube microstructure

Characteristics of Retained Austenite in TRIP Steels with Bainitic Ferrite Matrix

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1148-1151页

作者：张明亚 State Key Lab of Rolling and Automation Northeastern University

Heat treatment process for producing cold rolled transformation induced plasticity-aided （TRIP-aided） steels with bainitic ferrite matrix was adopted. Characteristics of retained austenite （RA） in such TRIP steels were investigated. SEM and OM determination results showed that the stable austenite retained at room temperature were mainly located between laths and some of them inside the coarse ferrite. The grains were uniformly distributed in heat treated steel matrix and the regularly dispersed RA represented to be triangular morphology. XRD analysis indicated that RA content in matrix was not less than 10%, and TEM testified that RA inside the matrix were formed at the prior austenite boundaries and represented to be single or twin crystals. The ductile fracture originated from the boundaries of martensite islands from RA and ferrite. The cracks propagated along grain boundaries and some passed through the large ferrite grains and induced transgranular fracture.

关键词： TRIP steel retained austenite morphology microstructure

大线能量焊接用钢粗晶热影响区针状铁素体形成过程控制技术的研究进展

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材料导报 2022年第5期36卷 145-155页

作者：杨宇龙贾潇朱伏先王平东北大学材料电磁过程研究教育部重点实验室沈阳110819 东北大学轧制技术及连轧自动化国家重点实验室沈阳110819

大线能量焊接用钢被广泛应用于船舶制造、海洋工程、桥梁制造、原油储罐等领域。宽厚板的大线能量焊接技术能有效节约成本,提高生产效率,是目前焊接领域备受关注的研究方向。而焊接接头附近是焊后力学性能最为薄弱的位置,焊接热影响区(H... 详细信息

大线能量焊接用钢被广泛应用于船舶制造、海洋工程、桥梁制造、原油储罐等领域。宽厚板的大线能量焊接技术能有效节约成本,提高生产效率,是目前焊接领域备受关注的研究方向。而焊接接头附近是焊后力学性能最为薄弱的位置,焊接热影响区(HAZ)尤其是粗晶焊接热影响区(CGHAZ)的力学性能是焊接评价的重要指标之一,因此对CGHAZ组织性能的控制是该领域重要的研究方向。针状铁素体组织是基于氧化物冶金工艺的大线能量焊接用高强钢焊后CGHAZ内的主要微观组织。针状铁素体组织的交错互锁结构有效保证了CGHAZ的韧性。如何有效控制针状铁素体的形成是大线能量焊接用钢研发的关键。针状铁素体的形成机理尚未统一,影响因素错综复杂。针状铁素体的形核过程可能由多种形核机制综合控制。而针状铁素体形核的主要影响因素与钢中夹杂物的特性有直接关系。通过改善钢中夹杂物的尺寸、形貌和分布,可以提高针状铁素体的形核效率。针状铁素体的互锁组织有效地保证了CGHAZ的韧性。针状铁素体形成过程的有效控制技术不仅是CGHAZ韧性不断提高的关键,也是开发高强度易焊板产品的关键因素。此外,它与免预热焊接材料的开发密切相关,成为该领域的主要研究方向。因此,本文通过总结相关领域诸多参考文献的关键信息,梳理了大线能量焊接用钢CGHAZ针状铁素体形成过程控制技术的发展历程,探讨了CGHAZ针状铁素体的形核机理及影响因素,并列举了相关领域的主要研究成果,为大线能量焊接用钢的技术研究和产品开发提供参考。

关键词：针状铁素体夹杂物形核粗晶焊接热影响区(CGHAZ) 大线能量焊接

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TRIP钢无缝管的开发及其成形性分析

中国工程科学 2014年第2期16卷 46-52页

作者：张自成朱伏先东北大学现代设计与分析研究所沈阳110819 东北大学机械工程与自动化学院沈阳110819 东北大学轧制技术及连轧自动化国家重点实验室沈阳110819

本文首次将趋于成熟的相变诱发塑性钢(TRIP钢)生产技术应用到钢管的生产领域,以冷拔钢管为原料,分别利用两阶段热处理和连续热处理两种方式成功开发出具有铁素体、贝氏体、残余奥氏体和少量马氏体组织的薄壁TRIP钢无缝管,并利用环形拉... 详细信息

本文首次将趋于成熟的相变诱发塑性钢(TRIP钢)生产技术应用到钢管的生产领域,以冷拔钢管为原料,分别利用两阶段热处理和连续热处理两种方式成功开发出具有铁素体、贝氏体、残余奥氏体和少量马氏体组织的薄壁TRIP钢无缝管,并利用环形拉伸以及冷弯等试验手段对其成形性能进行了试验研究。研究结果表明,TRIP钢无缝管具有较好的冷成形性能,可以在内高压成形等领域推广应用。另外,课题组开发的连续热处理设备完全可以用来生产TRIP钢管,为未来工业生产提供了重要参考。

关键词： TRIP钢热处理成形性能钢管微观组织

热输入量对一种新型药芯焊丝熔敷金属组织及冲击韧性的影响

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金属学报 2016年第7期52卷 890-896页

作者：宋峰雨李艳梅王平朱伏先东北大学材料电磁过程研究教育部重点实验室沈阳110819 东北大学轧制技术及连轧自动化国家重点实验室沈阳110819

采用自行研究开发的一种新型药芯焊丝,通过实验室大热输入焊接实验,研究分析了热输入量对焊缝熔敷金属组织与冲击韧性的影响规律.结果表明:在大热输入焊接条件下,熔敷金属中形成了大量细小、弥散分布的夹杂物,夹杂物周围诱导生成的大量... 详细信息

采用自行研究开发的一种新型药芯焊丝,通过实验室大热输入焊接实验,研究分析了热输入量对焊缝熔敷金属组织与冲击韧性的影响规律.结果表明:在大热输入焊接条件下,熔敷金属中形成了大量细小、弥散分布的夹杂物,夹杂物周围诱导生成的大量相互交叉互锁的针状铁素体晶粒,这是焊缝熔敷金属具有较高低温冲击韧性的主要原因;随着焊接热输入量的增加,尺寸为1μm以下的夹杂物数量减少,1μm以上夹杂物分布无显著变化,针状铁素体形核点减少,熔敷金属中针状铁素体晶粒尺寸略有增加、低温冲击韧性略有降低.

关键词：焊缝金属大热输入针状铁素体韧性

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区间模型结构非概率可靠性度量研究

机械强度 2012年第1期34卷 48-52页

作者：马景槐朱福先江苏技术师范学院材料工程学院常州213001

在掌握的不确定信息较少时,可运用非概率可靠性分析方法进行结构可靠性分析。对基于区间模型的非概率可靠性分析方法进行对比分析,探讨非概率可靠性指标、非概率集合可靠度和非概率安全可能度等非概率可靠性度量之间的关系,研究非概率... 详细信息

在掌握的不确定信息较少时,可运用非概率可靠性分析方法进行结构可靠性分析。对基于区间模型的非概率可靠性分析方法进行对比分析,探讨非概率可靠性指标、非概率集合可靠度和非概率安全可能度等非概率可靠性度量之间的关系,研究非概率集合可靠度的性质和计算方法。在结构应力—强度发生干涉时,建议采用非概率集合可靠度进行可靠性分析,并给出几种常见的应力—强度组合时非概率集合可靠度的计算方法。最后通过算例验证分析结论。

关键词：区间模型非概率可靠性非概率集合可靠度结构可靠性