热处理工艺对TC18合金锻件组织和性能的影响  

Effects of heat treatment process on microstructure and mechanical properties of TC18 alloy forged piece

作　　者：王媛[1] 董健[1] 王德琴[1] 

机构地区：[1]抚顺特殊钢股份有限公司技术中心,辽宁抚顺113001

出　　处：《金属热处理》2013年第8期93-95,共3页Heat Treatment of Metals

摘　　要：研究了不同热处理工艺对TC18合金锻件组织和性能的影响。结果表明,随着高温退火温度的升高,等轴初生α相含量减少,尺寸增加,片状次生α相含量增加并逐渐长大,按一定方向交叉排列,合金的强度升高,塑性降低。随着低温退火温度的升高,等轴初生α相的尺寸和含量变化不大,次生α相长大,弥散程度降低,合金的强度降低,塑性升高。TC18合金锻件经830℃×2 h炉冷到750℃×2 h,空冷+540℃×6 h,空冷热处理后,组织和性能良好,满足技术条件要求。Effects of heat treatment process on microstructure and mechanical properties of TC18 alloy forged piece were investigated.The results show that with the annealing temperature rising,the percentage of equiaxed primary α phase decreases and grain size increases,meanwhile the pescentage of lamellar secondary α phase increases and its grain size gradually grows up which leads to higher strength but lower plasticity for the TC18 alloy.Secondary α phase coarsens and dispersion degree declines with the increase of low-stage annealing temperature,the strength decreases but the plasticity increases.The microstructure and mechanical properties are preferable and meet standard specification when treated by 830 ℃ × 2 h,furnace cooled ＋ 750 ℃ × 2 h,air cooled ＋ 540 ℃ × 6 h,air cooled.

关 键 词：TC18合金锻件 热处理工艺 显微组织 力学性能 

分 类 号：TG166.5[金属学及工艺—热处理]