|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Effect of Direct Quenching on Microstructure and Mechanical Properties of a Wear-resistant Steel显示文摘A wear-resistant steel was hot rolled at the same finish temperature,and subsequently treated with conventional reheat quenching and tempering process(RQ&T) and direct quenching and tempering process(DQ&T),respectively.The effect of direct quenching on the microstructure and mechanical properties was investigated in detail by using optical microscope,transmission electron microscope and scanning electron microscope equipped with electron backscattered diffraction.The results showed that the microstructures of both the RQ and DQ specimens were complex constituents of lath martensite and lower bainite.Compared with the RQ specimen,the lower bainite content in DQ specimen was much higher.Furthermore,the bainite in the DQ specimen extended into and segmented the prior austenite grains,which can decrease martensite packet size.The proportion of high-angle boundary in the DQ specimen was higher than that in the RQ specimen,which may improve the impact toughness.The carbides in DQ&T specimen were much finer and distributed even dispersively because direct quenching can retain substantive defects which may provide more nucleation sites for carbide precipitation in the tempering process.Besides,the mechanical properties of DQ and DQ&T specimens were superior than those subjected to RQ and RQ&T processes,respectively. | Hongyu SONG Shunhu ZHANG Liangyun LAN Canming LI Haitao LIU Dewen ZHAO Guodong WANG | 2013 | Acta Metallurgica Sinica(English Letters)2013，26，4： | 7 |
| 2 | AlN Precipitates and Microstructure in Non-oriented Electrical Steels Produced by Twin-roll Casting Process显示文摘Aluminum nitride(AlN) precipitates and microstructure of 4 wt.%(Si+Al) non-oriented electrical steel were investigated.The 2.0 mm thick cast strips with three different silicon/aluminum(Si/Al) ratios were produced by twin-roll casting process,then the strips were reheated,warm rolled,cold rolled and annealed.The microstructure and AlN precipitates were characterized using optical microscopy,scanning electron microscopy and transmission electron microscopy.The results showed that with the increase of Si/Al ratio,on the one hand,the casting microstructure changed from columnar grains to equiaxed grains,and the uniformity of annealed microstructure was improved;On the other hand,the number of AlN precipitates in cast strips reduced meanwhile the distribution became dispersed.By the reheat treatment,the size and distribution of the AlN precipitates can be changed.Moreover,the grain size of the annealed strips is in the range of 20-50 μm,at the same time,many AlN precipitates were located at grain boundaries.Therefore,controlling the Si/Al ratio is a simple method to obtain desired microstructure.Then AlN precipitates in non-oriented electrical steel prepared by twin-roll casting process hinder markedly the recrystallized grains growth.A compatible reheat treatment can be an approach worth exploring to control the behavior of AlN precipitates. | Ting ZHANG Xiaoming ZHANG Zhiyuan GUO Yuqian WANG Chenggang LI Liangyun LAN | 2013 | Acta Metallurgica Sinica(English Letters)2013，26，4： | 5 |
| 3 | Effect of boron addition on the microstructures and mechanical properties of thermomechanically processed and tempered low carbon bainitic steels显示文摘Thermomechanical process and tempering heat treatment were employed to produce the experimental steel plates. The effect of boron addition on the microstructure and mechanical properties of low carbon bainitic steels was studied in this paper. Microstructure observation and crystallographic features were conducted by using optical microscopy, SEM, TEM and electron back scattering diffraction (EBSD) analysis. The results showed that under the same rolling processes and heat treatment conditions, a substantial increase in strength is obtained by addition of boron into steel, but accompanied by an obvious drop in toughness. New martensite phase forms along the grain boundaries on tempering at 650 C mainly due to boron segregation, which can further deteriorate impact toughness of the boron bearing steel. The EBSD analysis showed that high angle grain boundary is not responsible for the deteriorated toughness of the boron bearing steel because it has relatively higher percentage of high angle grain boundary than the boron free steel. The low toughness of the boron bearing steel is mainly attributed to the coarse boride precipitated particles according to the results of fractograph observation. | Liangyun LAN Chunlin QIU Ping ZHOU Dewen ZHAO Canming LI Xiuhua GAO Linxiu DU | 2011 | Acta Metallurgica Sinica(English Letters)2011，24，6： | 2 |
| 4 | Analysis of martensite-austenite constituent and its effect on toughness in submerged arc welded joifit of low carbon bainitic steel显示文摘 | LAN Liangyun QIU Chunlin ZHAO Dewen | 2012 | Journal of Materials Science2012，47，11： | 1 |
| 5 | Analysis of microstructural variation and mechanicalbehaviors in submerged arc welded joint of high strengthlow carbon bainitic steel显示文摘 | LAN Liangyun QIU Chunlin ZHAO Dewen | 2012 | Materials Science andEngineering: A2012，558，： | 1 |
| 6 | Mi- crostruetural characteristics and toughness of the simulated coarse grained heat affected zone of high strength low carbon bainitie steel显示文摘 | Lan Liangyun Qiu Chunlin Zhao Dewen | 2011 | Materials Sei ence Engineering A2011，529，1： | 1 |
| 7 | Microstructural Evolution and Toughness in the HAZ of Submerged Arc Welded Low Welding Crack Susceptibility Steel显示文摘Microstructural characteristics of different sub-regions of heat affected zone (HAZ) of low welding crack susceptibility steel weldment were investigated by using optical microscopy and scanning electron microscopy equipped with electron backscattered diffraction system. And the focus was put on the correlation between microstructural characteristics and HAZ toughness of the weldment. The results reveal that the toughness of fusion line zone (FLZ) specimens is much lower than that of fine grained HAZ (FGHAZ) specimens. The coarse inclusions in the weld metal and the large martensite-austenite constituents in the coarse grained HAZ (CGHAZ) have an obvious negative effect on the crack initiation energy of FLZ. Meanwhile, the coarse granular bainite with large effective grain decreases the crack propagation energy seriously. By contrast, fine crystallographic grains in the FGHAZ play a key role in increasing toughness, especially in improving crack propagation energy. | Chunlin QIU Liangyun LAN Dewen ZHAO Xiuhua GAO Linxiu DU | 2013 | Acta Metallurgica Sinica(English Letters)2013，26，1： | 1 |
| 8 | Analysis of microstructural variation and mechanical behaviors in submerged arc welded joint of high strength low carbon bainitic steel 显示文摘 | LAN Liangyun QIU Chunlin ZHAO Dewen | 2012 | Materials Science and Engineering A2012，558，： | 1 |
| 9 | Microstructural characteristics and toughness of the simulated coarse grained heat affected zone of high strength low carbon bainitic steel显示文摘 | Lan Liangyun Qiu Chunlin Zhao Dewen | 2011 | Materials Science and Engineering A2011，529，1： | 1 |
| 10 | Characterization of coarse bainite transformation in low carbon steel during simulated welding thermal cycles 显示文摘 | LAN Liangyun KONG Xiangwei QIU Chunlin | 2015 | Materials Characterization2015，105，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员