摘要
研究了不同热处理制度对TC4合金中厚板的显微组织和力学性能的影响。结果表明,经800℃×1 h/AC(空冷)退火后,组织为球状α+少量的长条状α+少量β组织,其拉伸性能比热轧态略有下降;热轧后的TC4合金板材经960℃×80 min/AC固溶处理后,组织为双态组织,即初生α+针状(α+β),其横向抗拉强度和屈服强度与普通退火态的相比分别降低了35 MPa和75 MPa。固溶后的TC4合金板经700℃×120 min/AC时效后,初生α相的含量变少,β晶粒尺寸变大,片状次生α相拉长并粗化,与800℃×1 h/AC退火相比,虽然拉伸性能有所降低,但性能更加均匀,各向异性不明显。热轧后的TC4合金板经1000℃×20 min/WQ(水冷)后,β相发生马氏体转变,组织为非常细小的针状组织,抗拉强度比普通退火略有提高,但屈服强度和塑性急剧下降。
Effects of heat treatment on microstructure and mechanical properties of TC 4 alloy plates were studied .The result shows that annealed under 800 ℃×1 h/AC( air cooling ) , microstructure of the alloy consists of equiaxed αand a small amount of αand β, and the strength decreases slightly compared with that of the as-hot rolled .When solution treated under 960 ℃×80 min/AC, microstructure of the alloy consists of primary αand acicular (α+β) , and the transverse tensile strength and yield strength reduce by 35 MPa and 75 MPa, respectively, compared with these of the as-annealed.When aged under 700 ℃×120 min/AC, the amount of primary αreduces,βphase grain coarsens , and subsequent acicular αgrain lengthens and coarsens .Compared with the annealed at 800 ℃ ×1 h/AC, the tensile strength decrease a little , but the anisotropic is not obvious .When heated at 1000 ℃for 20 min and then water quenched ,βphase occurs martensitic transformation , the microstructure evolves as fine acicular (α+β) , the tensile strength is slightly improved , but the yield strength and ductility reduce rapidly .
出处
《金属热处理》
CAS
CSCD
北大核心
2014年第11期92-95,共4页
Heat Treatment of Metals
关键词
TC4合金中厚板
热处理
组织
性能
TC4 alloy plates
heat treatment
microstructure
mechanical properties
