A.L. Fan
,
W.H. Tian
,
Q. Sun
,
B.S. Wang
金属学报(英文版)
The microstructures of electroformed copper liners of shaped charges that had undergone high-strain-rate deformation were observed by optical microscopy (OM) and scanning electron microscopy (SEM). Meanwhile, the orientation distribution of the grains in the recovered jet was examined by electron backscattering Kikuchi pattern (EBSP) technique. EBSP analysis reveals that the fibrous texture observed in the as-electroformed copper liners disappeared after explosive detonation deformation. OM observation shows that the microstructure evolves systematically from the jet center to its perimeter during cooling from high temperatures after explosive detonation deformation. This microstructural characteristic is similar to that of solidification, i.e. there exist equiaxed grains in the center of the jet and significant columnar grains around the equiaxed grains. The result reveals that there is melting-related phenomenon in the jet center. Corresponding microhardness variations from the jet center to its perimeter is also determined. All the phenomena can be explained by a strong gradient of temperature across the section of the jet during plastic deformation at high-strain-rate.
关键词:
jetting
,
null
,
null
余宏伟
,
王世森
,
王孝东
,
洪君
物理测试
针对鄂钢轧制的部分宽厚板表面出现结疤现象,应用金相显微镜、扫描电镜和能谱分析仪对Q345q热轧态钢板表面疤状物形态和成分进行观察,对形成原因进行分析并提出改进措施。结果表明：疤状缺陷为块状的非金属夹杂/渣,并在钢板表面形成凹坑,其成分为含有Si、Ti、Al、Ca、Mg的氧化物或硅酸盐、铝酸盐等,其主要为炼钢过程中的脱氧产物和合金的氧化产物。因此在生产过程中,通过去除钢水中夹杂物和清理铸坯等,减少非金属夹杂/渣,以提高钢板表面质量。
关键词:
Q345q
,
疤状缺陷
,
钢板
,
非金属夹杂
,
非金属夹渣
WANG Lei
,
GAO Cai-ru
钢铁研究学报(英文版)
Thermal mechanical control processing (TMCP), the combination of controlled rolling and controlled cooling, provides a powerful means of developing high-strength low alloy (HSLA) steels by intensive microstructural control. In the present investigation, the effects of TMCP parameters, consisting of the finish cooling temperature and the start rolling temperature in non-recrystallization region, on the final microstructure and mechanical properties of Q460q steel have been studied by tensile, Charpy impact tests, optical microscopy. The TMCP parameters for Q460q steel have been optimized by laboratory experiments. And the microstructure and properties of industrial product were coincident with the results of laboratory experiments.
关键词:
;TMCP;mechanical properties;M/A constituent;Q460q steel
王小华
,
撒世勇
,
侯发臣
,
张义涛
材料开发与应用
doi:10.3969/j.issn.1003-1545.2009.02.011
桥梁结构复杂,构件制作时需大量采用焊接,焊接的方法主要是埋弧自动焊,为了验证321-Q370q复合板能否满足桥梁用钢的焊接要求,对复合板埋弧焊接头进行了一系列性能试验.试验结果表明,焊接接头各项性能均能满足相关标准要求.
关键词:
321-Q370q复合板
,
埋弧自动焊
,
性能试验
李智博
,
郭健
,
张贺宗
物理测试
doi:10.3969/j.issn.1001-0777.2005.06.015
55Q轻轨在使用前由于受到机械加工力而断裂,进行了化学成分、显微组织、夹杂物和低倍检验分析.结果表明,其发生断裂的主要原因是存在较多的小发纹(白点),加之较严重网状组织、夹杂物、晶粒粗大和边部脱碳组织,在机械加工力的共同作用下,导致轻轨发生断裂.
关键词:
55Q轻轨
,
氢致断裂
,
网状组织
,
晶粒粗大
