热变形工艺对GH720Li合金棒材颗粒状未再结晶组织演变行为的影响
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摘要
为了破碎GH720Li合金棒材中颗粒状未再结晶组织,进行了不同工艺参数下的热压缩变形试验,采用OM观察了各工艺下的显微组织。结果表明,热变形过程中,颗粒状未再结晶组织由颗粒边缘向心部逐渐被破碎。变形温度越高,变形量越大,未再结晶组织的破碎程度越大。1100℃变形时,75%的变形量仍无法完全破碎未再结晶组织,高、低温复合变形能破碎未再结晶组织,但高温变形时长大的晶粒无法在低温变形时细化。
In order to break the granular unrecrystallized microstructure in GH720Li alloy bar, the thermal compression deformation test was carried out under different technological parameters. The microstructure was observed by OM under various technologies. The results show that during thermal deformation, the granular unrecrystallized microstructure is gradually broken from the edge of the particle to the center. The higher the deformation temperature is, and the greater the amount of deformation is, the greater the breakage degree of unrecrystallized microstructure is. When the deformation tenperature is 1100 ℃, the 75% deformation quantity can not completely break the unrecrystallized microstructure. The high and low temperature composite deformation can break the unrecrystallized microstructure, but the grown grain at high temperature can not be refined at low temperature.
In order to break the granular unrecrystallized microstructure in GH720Li alloy bar, the thermal compression deformation test was carried out under different technological parameters. The microstructure was observed by OM under various technologies. The results show that during thermal deformation, the granular unrecrystallized microstructure is gradually broken from the edge of the particle to the center. The higher the deformation temperature is, and the greater the amount of deformation is, the greater the breakage degree of unrecrystallized microstructure is. When the deformation tenperature is 1100 ℃, the 75% deformation quantity can not completely break the unrecrystallized microstructure. The high and low temperature composite deformation can break the unrecrystallized microstructure, but the grown grain at high temperature can not be refined at low temperature.
引文
[1]中国金属学会高温材料分会.中国高温合金手册[M].北京:中国质检出版社,2012:869-870.
[2]孙雅茹,孙文儒,郭守仁,等.γ'相对U720Li合金热变形行为的影响[J].材料热处理学报,2013,34(3):50-54.
[3]于秋颖,姚志浩,董建新,等.难变形高温合金GH4720Li的超塑性变形行为[J].材料热处理学报,2015,36(7):30-35.
[4]兰博,于秋颖,张敏聪,等.GH720Li合金棒坯热变形加热过程的晶粒长大模型[J].热加工工艺,2017,46(8):107-112.
[5]曲敬龙,杜金辉,王民庆,等.GH4720Li合金细晶棒材制备的热加工工艺研究[J].材料工程,2013(2):74-77.
[6]曲敬龙,杜金辉,毕中南,等.等温锻造工艺对GH4720Li合金盘锻件组织的影响[J].钢铁研究学报,2012,24(2):49-53.
[2]孙雅茹,孙文儒,郭守仁,等.γ'相对U720Li合金热变形行为的影响[J].材料热处理学报,2013,34(3):50-54.
[3]于秋颖,姚志浩,董建新,等.难变形高温合金GH4720Li的超塑性变形行为[J].材料热处理学报,2015,36(7):30-35.
[4]兰博,于秋颖,张敏聪,等.GH720Li合金棒坯热变形加热过程的晶粒长大模型[J].热加工工艺,2017,46(8):107-112.
[5]曲敬龙,杜金辉,王民庆,等.GH4720Li合金细晶棒材制备的热加工工艺研究[J].材料工程,2013(2):74-77.
[6]曲敬龙,杜金辉,毕中南,等.等温锻造工艺对GH4720Li合金盘锻件组织的影响[J].钢铁研究学报,2012,24(2):49-53.