摘要
通过对等温锻造和热连轧工艺制备的GH4169合金进行直接时效、蠕变性能测试和组织形貌观察,研究热连轧对GH4169合金组织结构及蠕变行为的影响。结果表明:与等温锻造合金相比,经热连轧后合金的晶粒尺寸较小,在等温锻造期间的变形特征仅为孪晶形变,而合金在热连轧期间除产生孪晶外,在孪晶中还存在位错的双取向滑移;采用不同工艺制备的合金均在{111}面上发生孪晶变形。在蠕变期间,热连轧期间形成的位错可促进孪晶内发生位错的不同取向滑移,减缓应力集中,提高合金蠕变抗力,致使合金在660℃、700 MPa条件下具有较长蠕变寿命。
By means of direct aging treatment,the creep properties measurement and microstructure observation of the isothermal forged（ITF） and hot continuous rolling（HCR） GH4169 alloys,the influence of the HCR on the microstructure and creep behavior of GH4169 alloy was investigated.The results show that the grain size of HCR alloy is finer than that of the ITF alloy.The only deformed feature of the ITF alloy is twinning.However,the twinning and dislocation slippings with double orientations in the twinning appear in the alloy during HCR.Moreover,the deformed twinnings occur on {111} planes in the alloys prepared by different technics.During creep,the dislocations formed during HCR can promote the dislocations slipping of different orientations within the twinning to decrease the stress concentration,which may enhance the creep resistance and result in longer creep lifetime of the alloy under the applied stress of 700 MPa at 660 ℃.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2011年第7期1541-1546,共6页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金重点项目(50634030)
关键词
GH4169合金
热连轧
孪晶
蠕变
变形特征
GH4169 superalloy
hot continuous rolling
twinning
creep
deformation feature
