YANG Hai-ying, CHEN Jun, ZHAO Yong-qing. Effect of Heat Treatment on Microstructure and Mechanical Properties of TC4-DT Alloy[J]. Development and Application of Materials, 2009, 24(2): 13-16. DOI: 10.19515/j.cnki.1003-1545.2009.02.004
Citation: YANG Hai-ying, CHEN Jun, ZHAO Yong-qing. Effect of Heat Treatment on Microstructure and Mechanical Properties of TC4-DT Alloy[J]. Development and Application of Materials, 2009, 24(2): 13-16. DOI: 10.19515/j.cnki.1003-1545.2009.02.004

Effect of Heat Treatment on Microstructure and Mechanical Properties of TC4-DT Alloy

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  • Received Date: November 12, 2008
  • Available Online: March 29, 2024
  • Effect of series heat treatment on microstructure and room temperature mechanical properties of TC4-DT alloy bar in diameter 300mm was investigated.The results show that in the microstructure of 300mm bar forged in α+β region,the grains are coarse and vague with obvious grain bindery in some field,which suggests that the big TC4-DT bars has poor uniform inforgings.The tensile properties and fracture toughness of big bars being treated after α+β double annealing can reach to Rm ≥ 825MPa,RP0.2 ≥ 750 MPa,A ≥ 8%,Z ≥ 15%;KIC(T-L) ≥ 90MPa·m½,indicating excellent match properties between strength and plasticity.The fatigue crack propagation vacuity can reach 2.833036×10-6mm/cycle and 7.294209×10-6 mm/cycle respectively after heat treated at 965℃/1h AC+550℃/6h AC and 940℃/1h AC+570℃/6h AC heat treatments.
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