Heryueh HUANG
,
Shengwen SHYU
,
Kuanghung TSENG
,
Changpin CHOU
材料科学技术（英文）
The effects of the process parameters of TIG (tungsten inset gas)-flux welding on the welds morphology, angular distortion, ferrite content and hot cracking in austenitic stainless steel were investigated. Autogenous TIG welding process was applied to the type 304 stainless steel through a thin layer of activating flux to produce a bead on plate welded joint. TiO2, SiO2, Fe2O3, Cr2O3, ZnO and MnO2 were used as the activating fluxes. The experimental results indicated that the TIG-flux welding can increase the weld depth/width ratio and reduce the HAZ (heat affected zone) range, and therefore the angular distortion of the weldment can be reduced. It was also found that the retained ferrite content within the TIG-flux welds is increased, and has a beneficial effect in reducing hot cracking tendency for stainless steels of the austenitic type weld metals. A plasma column constriction increases the current density at the anode spot and then a substantial increase in penetration of the TIG-flux welds can be obtained.
关键词:
TIG-flux welding
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null
,
null
,
null
薛松柏
,
马鑫
,
钱乙余
,
中国稀土学报
采用二元系Miedema生成热模型及其Tanaka过剩熵修正和三元系Chou几何模型, 分析了稀土元素La与Sn-Pb软钎料合金体系中组元元素的相互作用关系. 热力学计算表明, 在Sn-Pb合金体系中, La具有"亲Sn"倾向. 这是添加稀土元素改变Sn-Pb软钎料合金金属学性能的一个基本前提.
关键词:
稀土
,
镧
,
Sn-Pb合金
,
热力学
蔺晓明
,
刘振国
,
卢子兴
复合材料学报
doi:10.3321/j.issn:1000-3851.2006.06.028
在作者已有的内胞模型基础上,结合陈利等的面胞纱线走向及Chou等对表面纤维束截面形状的描述,建立了由面胞和内胞组合的有限元分析模型,比较真实地模拟了三维四向编织复合材料的真实结构.通过有限元计算预测了其弹性性能,并同实验结果进行了比较,分析讨论了三维四向编织复合材料的面胞对整体弹性性能的影响.研究结果证明了面胞在三维四向编织复合材料弹性性能有限元预测中的重要性.
关键词:
复合材料
,
三维编织
,
几何模型
,
弹性性能
