专题研究
机械制造文摘一
热处理对lnconel718合金电子束焊接头
微观组织和性能的影响
郑欣，师玉英，陈玉宝，张伟杰
（中国航发哈尔滨东安发动机有限公司，黑龙江哈尔滨150066）
焊接分册
摘要：研究了"双8时效"制度和"短时效"制度对Inconel718高温合金母材和焊缝区的金相组织、室温力学性能的影响。结果表明，焊缝区为铸造组织特征，定向生长的树枝晶内析出和强化相，枝品主干细长挺直，两侧的二次枝品以8相为主，形态短而直。由于“短时效"热处理的温度偏高，使亚稳定相向8稳定相转变，导致“短时效”热处理后焊件的显微硬度和强度略低于“双8时效"热处理试件，而断后伸长率基本无变化。
关键词：高温合金；电子束焊；时效热处理：微观组织；力学性能中图分类号：TG156
Theeffectsofheattreatmentsonthemicrostructureand propertiesofInconel718electronbeamweldingjoints
Zheng Xin, Shi Yuying, Chen Yubao, Zhang Weijie
(AERO Engine Corporation of China, Harbin 150066,China)
Abstract : The effects of the “two-eight aging" and “short-aging" processes on the microstructure and room-tempera ture mechanical properties of Inconel 718 matrix and welding joints were studied. The casting structure morphology was obtained in the welding joints and the and ' reinforcing phases were precipitated in the dendrite crystals, The main dendrite was long and straight. However, the short and straight sub-dendrite crystals containing phase were precipitated on both sides of the main dendrites. The metastable " phase was transfomed into the stable phase be-cause of the higher temperature of the “short-aging" process. As a result, the microhardness and the strength were lower than those of the “two-eight aging" process, and the elongation was not changed.
Key words: high-temperature alloy ; electron beam welding; aging treatment; microstructure; mechanical prop erties
0前言
Inconel718是镍基高温合金，具有良好的抗热疲劳、抗氧化和冷、热加T性能，并在650℃具有较高的强度和 262017年第1期
万方数据
良好持久、疲劳性能1-2。被广泛应用于制作航空发动机的气压机盘、涡轮盘、机厘和叶片等高温结构部件。
Inconel718高温合金的热处理方式主要由固溶处理和时效处理两部分组成。经固溶时效处理后析出体