排序方式： 共有5条查询结果，搜索用时 171 毫秒
1
1.
The influences of Mn and Ni contents on the impact toughness and microstructure in the weld metals of high strength low alloy steels were studied. The objective of this study was to determine the optimum composition ranges of Mn and Ni to develop welding consumables with better resistance to cold cracking. The results indicated that Mn and Ni had considerable effect on the microstructure of weld metal, and both Mn and Ni promoted acicular ferrite at the expense of proeutectoid ferrite and ferrite side plates. Varying Ni content influenced the Charpy impact energy, the extent of which depended on Mn content. Based on the properties and impact resistance, the optimum levels of Mn and Ni were suggested to be 0.6%—0.9%,, and 2.5%—3.5%, respectively. Additions beyond this limit promoted the formation of segregation structures and other microstructural features, which may be detrimental to weld metal toughness. 相似文献
2.
运用文献资料法、逻辑分析法等,从中国式摔跤术语概念的界定及其特点、中国式摔跤术语命名的必要性分析、中国式摔跤术语的标准化分类等方面对中国式摔跤术语标准化进行了探讨,旨在进一步完善中国式摔跤基础理论,助推中国式摔跤得到更好的传承和发展。 相似文献
3.
4.
2009年我国房价持续飙升,部分城市甚至出现一房难求的怪状.由于房价的飞速上涨,越来越多的家庭沦为新一代的房奴.针对持续上涨的房价,我国近期出台了一系列的遏制房价的政策,但效果并不理想.本文针对房价逆遏制政策而上涨的现象进行了剖析,并提出了相应的对策. 相似文献
5.
1