赵红霞,沙爱学,王庆如,等.双重退火对ZTC18铸造钛合金组织及性能的影响[J].精密成形工程,2018,10(3):34-39.
ZHAO Hong-xia,SHA Ai-xue,WANG Qing-ru,et al.Effect of Dual-annealing on Microstructure and Properties of ZTC18 Cast Titanium Alloy[J].Journal of Netshape Forming Engineering,2018,10(3):34-39. |
| 双重退火对ZTC18铸造钛合金组织及性能的影响 |
| Effect of Dual-annealing on Microstructure and Properties of ZTC18 Cast Titanium Alloy |
| 投稿时间：2018-05-03 修订日期：2018-05-10 |
| DOI：10.3969/j.issn.1674-6457.2018.03.007 |
| 中文关键词: 铸造钛合金 双重热处理 组织性能 |
| 英文关键词: cast titanium alloy dual-heat treatment microstructure property |
| 基金项目:北京航空材料研究院基金 |
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| 中文摘要: |
| 目的 研究ZTC18合金双重退火热处理时合金微观组织和力学性能的变化规律。方法 通过对ZTC18合金熔模精密铸造拉伸试棒试验件进行双重退火热处理实验，对比不同热处理工艺铸件的微观组织和力学性能，分析其变化规律。结果 不同的双重退火温度下，晶粒尺寸无明显变化，随着第2级退火温度升高，晶粒内部初生α相由长针状逐渐变化为棒状及等轴颗粒，次生α相逐渐减少，合金的强度随第2级退火温度升高而降低，塑性则呈增加趋势。结论 通过双重热处理可以达到调整合金强度塑性比的目的，对比HIP后的室温拉伸数据，在二级退火温度为610和590 ℃的试样（空冷或炉冷）的强度和塑性综合匹配性较好，抗拉强度能够达到1100 MPa，伸长率大于11%。 |
| 英文摘要: |
| The paper aims to research change rules for microstructure and mechanical property of ZTC18 alloy dual-annealing treatment. Investment casting tensile test bar of ZTC18 alloy was treated by dual-annealing to compare microstructure and mechanical property of different thermal treatment castings and analyze their change rules. The grain size did not change apparently with the increase of second annealing temperature; the primary α phase transformed from irregular needle- like morphology to rod-like morphology and equiaxed morphology; and the secondary α phase decreased and the strength of alloy decreased with the increase of the second annealing temperature. While the plasticity increased. The strength and plasticity ratio of alloy might be adjusted by dual-annealing treatment. After comparing data on tensile at room temperature after HIP, the comprehensive matching of strength and plasticity of sample is good at 610 and 590 ℃ of second annealing. The tensile strength could reach 1100 MPa and the elongation exceeds 11%. |
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