J.M. Zhang
,
L.Z. Ma
,
J. Y. Zhuang
,
Q. Deng
,
J.H Du and Z. Y Zhong(Department of Superalloys
,
Central Iron & Steel Research Institute
,
Beijing 100081
,
China)P. Janschek(Thyssen Umformtechnik GMBH
,
42859 Remscheid
,
Germany Manuscript received 26 August 1996)
金属学报(英文版)
Isothermal constant speed compression tests of superalloy IN718 were conducted using a computer-controlled MTS machine at temperatures from 960 to 1040℃, with initial strain rates from 0.001 s~(1) to 1.0 s~(1) and engineering strain from 0.1 to 0. 7.The variations of flow stress with deformation temperature, initial strain rate and engineering strain were analyzed in the paper. It was found that there was an obvious power-law relationship between flow stress and initial strain rate, which showed the behavior of strain rate hardening of superalloy IN718 at elevated temperatures.The relationship between flow stress and temperature could be described by an inverse trigonometric function.And the turning point on the curve may be related to the behavior of δ phase at 1000℃. Meanwhile, it was found that there was a complicated relationship between flow stress and strain,which was indicative of the comprehensive effect of work hardening and dynamic softening on flow stress during hot deformation. From the results of these tests, a constitutive equation of superalloy IN718 was developed.
关键词:
: constitutive relationship
,
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
黄朝红
,
肖敬忠
,
张庆礼
,
赵南京
,
王爱华
,
殷绍唐
,
余吟山
量子电子学报
doi:10.3969/j.issn.1007-5461.2003.01.005
本工作采用二价Ca离子作为电荷补偿离子由提拉法生长出了具有高光学质量的调Q开关晶体Cr4+:YAG.所生长的晶体在空气中退火(1450℃)50小时后,晶体的颜色明显加深.吸收光谱测量表明晶体中的Cr4+离子浓度得到显著提高.在闪光灯泵浦的Nd:YAG激光器上对不同透过率、退火后的Cr4+:YAG晶体进行了被动调Q实验.结果表明所生长出的Cr4+:YAG晶体对Nd:YAG激光器具有很好的调Q作用.
关键词:
Cr4+:YAG
,
晶体生长
,
退火
,
被动调Q
,
灯泵Nd:YAG激光器
