| 摘要 |
<p>PURPOSE:To manufacture the water wheel runner in high efficiency decreasing the transformation of blade, by carrying out electroslag casting of the blade using maltensitic stainless steel material and welding with neighboring member after carrying out tempering treatment. CONSTITUTION:Electroslag casting of maltensitic stainless steel material is carried out using moving water cooling mold and blade of water wheel runner is formed. Then, tempering treatment is carried out and uniform austenite phase is made heating more than Ac1 point and then, necessary strength and toughness are given. Obtained blade 13 is joined with neighoring member by welding, such as the crown 10, shround ring 12 etc. Electroslag casted blade has clean casting surface and processing before welding is nearly unnecessary and also, construction efficiency of the water runner is widely improved.</p> |
