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某涡轮机匣原采用高温合金GH132锻坯经机械加工而制成,因其高温强度大,锻造温度范围窄,毛坯尺寸又大,生产极为困难。为此,将整体结构涡轮机匣毛坯改为分段等离子弧焊接结构,以小拚大,用普通吨位的锻压设备锻制。一、GH132合金的焊接特点及焊接方法的选择 GH132合金是一种时效强化铁基高温合金。合金中Cr、Ni含量保证了合金在固溶处理后具有奥氏体组织。以Al、Ti等元素在时效处理后形成金属间化合物Ni_3(Al,Ti)(即γ~2
A turbine casing original high temperature alloy GH132 forged by machining machining made of, because of its high temperature strength, forging temperature range narrow, large blank size, production is extremely difficult. To this end, the overall structure of the turbine casing blank to segment plasma arc welding structure to small spell, with normal tonnage forging equipment forging. First, GH132 alloy welding characteristics and welding options GH132 alloy is a kind of aging strengthened iron-based superalloy. Alloy Cr, Ni content to ensure that the alloy after solution treatment with austenitic structure. With Al, Ti and other elements in the aging treatment after the formation of intermetallic compounds Ni_3 (Al, Ti) (ie γ ~ 2