J.S. Ye
,
Z.R. Ye
,
A. Yang
金属学报(英文版)
A modified temperature-phase transformation-stress coupled 3D non-linear mathemat-ical model and a series of subroutines on the non-liner MARC (MARC Analysis Re-search Corporation) are developed. Then this modified model has been utilized to simu-late the heat treatment processes of 280 connecting rod of 16V280ZJ diesel locomotive.The simulation results are basically in agreement with the experiments, which testifythat the mathematical model and method are feasible. In addition, the simulationcan not only obtain the transient temperature and microstructure of heat treatmentprocess, but also provide a sound scientific basis for the heat treatment workers.
关键词:
non-linear
,
null
,
null
,
null
J.S. Ye
金属学报(英文版)
280 connecting rod is one of the most important parts for 16V280ZJ diesel locomo-
tive, so it needs much better mechanical performance. However, the crack is often
generated at the middle section of connecting rod body on heat treatment process. A
temperature-phase transformation-stress coupled 3D non-linear mathematical model
has been developed to analyze the reasons of cracking. The simulation and experimen-
tal results show that the compressive stress on the cracking position is close to the
fracture stress of connecting rod and the reasons of crack are mainly contributed to
the carbon content excess of original material or the aging of quenchant.
关键词:
crack
,
null
,
null
郭文敏
,
韩宝忠
,
李忠华
功能材料
以聚乙烯(PE)和碳化硅(SiC)粉末共混复合体系为研究对象,实验研究了聚合物基体、SiC浓度、温度及压力等因素对该体系直流伏安特性的影响.实验结果表明,增加SiC的掺量、升高温度和增大压力均能提高PE/SiC复合材料的非线性电导率,而聚合物基体结晶度不同对复合材料的非线性电导率的影响也是不同的.
关键词:
聚乙烯
,
碳化硅
,
电导
,
非线性
朱阳阳
,
岳银超
,
赵营
,
涂衡
,
翟乃霞
,
胡章贵
人工晶体学报
分别在有氧气氛(空气)和还原气氛(氢气/氩气混合气)下生长了YAl3(BO3)4(YAB)晶体,并研究了不同生长条件下生长的YAB晶体的透过和266nm激光的输出性能.结果表明,还原气氛下生长的YAB晶体能够消除266 nm附近的吸收,但是晶体的266 nm输出性能并未得到提高.分析推测了可能的原因,并对下一步工作提出可行性的建议.
关键词:
YAB晶体
,
非线性
,
四倍频
,
还原气氛
