日本亚洲色图日韩_欧美熟妇色ⅩXXX欧美妇_国产免费最爽的乱婬视频a_初高中女厕所自慰网站观看_绯色av无码一区二区三区免费_欧美丝袜自拍制服另类_夜夜38亚洲综合网_成人在线免费观看国产视频大全_国产成人精品福利网站人_日韩一级 片内射中文小说

welcome to Baoji BaoTi Metal Products Co., Ltd.!

Baoji Titanium Alloy: Heat Treatment of High Temperature Elastic Alloys The elastic alloys used at high temperatures are iron-based and nickel-based.

[ Info Diffusion:Admin | Times:2018-01-22 | Hits:1406 ]

Heat treatment of high temperature elastic alloys The elastic alloys used at high temperatures are iron-based and nickel-based.

Iron-based superalloys GHl35, GHl32, etc. are used to make springs. The role of chromium is mainly to form a dense oxide film on the surface of the metal. The role of nickel is to maintain the austenitic structure of the matrix (because austenitic steel has higher heat strength than ferritic steel at high temperatures), And forming an intermetallic compound 7 with strong precipitation strengthening effect with elements such as titanium and aluminum, and phases Ni3 (TiAl) and Ni3 (A1Ti). Tungsten and molybdenum mainly act as solid solution strengthening, and boron acts to purify grain boundaries and improve creep resistance.