新型含铝奥氏体耐热合金的高温塑性变形行为和热加工性能

doi:10.11901/1005.3093.2018.432

材料研究学报

2019, Vol. 33

Issue (3): 232-240 DOI: 10.11901/1005.3093.2018.432

本期目录 | 过刊浏览

新型含铝奥氏体耐热合金的高温塑性变形行为和热加工性能

杨雨童,罗锐(

),程晓农,桂香,陈乐利,王威,郑琦

江苏大学材料科学与工程学院镇江 212013

High Temperature Plastic Deformation Behavior and Hot Workability of an Alumina-forming Austenitic Heat-resisting Alloy

Yutong YANG,Rui LUO(

),Xiaonong CHENG,Xiang GUI,Leli CHEN,Wei WANG,Qi ZHENG

School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

引用本文:

杨雨童,罗锐,程晓农,桂香,陈乐利,王威,郑琦. 新型含铝奥氏体耐热合金的高温塑性变形行为和热加工性能[J]. 材料研究学报, 2019, 33(3): 232-240.
Yutong YANG, Rui LUO, Xiaonong CHENG, Xiang GUI, Leli CHEN, Wei WANG, Qi ZHENG. High Temperature Plastic Deformation Behavior and Hot Workability of an Alumina-forming Austenitic Heat-resisting Alloy[J]. Chinese Journal of Materials Research, 2019, 33(3): 232-240.

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摘要:

新型含铝奥氏体耐热合金(AFA)进行压缩热模拟试验，使用OM和EBSD等手段研究了这种合金在950~1150℃和0.01~5 s^-1条件下的微观组织演变、建立了基于动态材料模型热加工图、分析了变形参数对合金加工性能的影响并按照不同区域组织变形的特征构建了合金的热变形机理图。结果表明：新型AFA合金的高温流变应力受到变形温度和应变速率的显著影响。在变形温度为950~1150℃和应变速率为0.18~10 s^-1条件下，这种合金易发生流变失稳。在变形温度为1050~1120℃、应变速率0.01~0.1 s^-1和变形温度1120~1150℃、应变速率10^-0.5~10^-1.5 s^-1这两个区间，这种合金发生完全动态再结晶行为且其再结晶晶粒均匀细小，功率耗散因子η达到峰值45%。新型AFA合金的热加工艺，应该优先选择再结晶区域。

关键词 ：金属材料, 奥氏体耐热合金, 热变形, 动态再结晶, 变形机制

Abstract：

The deformation behavior of a new alumina-forming austenitic stainless steel (AFA) was investigated by means of isothermal hot compression test with a strain rate range of 0.01~5 s^-1 at 950~1150℃, as well as OM and EBSD characterization. The hot processing map of the AFA steel was established based on dynamic material model. The influence of deformation parameters on the processability of the steel was also analyzed. Besides, the thermal deformation mechanism diagram was also constructed according to the deformation characteristics of different regions. The results show that the high temperature flow stress of the new AFA steel is significantly affected by the deformation temperature and strain rate. Serious flow instability can be observed at 950~1150℃ with strain rates of 0.18~5 s^-1. Fully dynamic recrystallization occurred under the deformation conditions of 1050~1120℃ and 0.01~0.1 s^-1 or 1120~1150℃ and 10^-0.5~10^-1.5 s^-1. The recrystallized grains are fine and homogeneous with the power dissipation factor η reaching the peak value of 45%. It is proposed that the recrystallization zone should be preferentially selected and the flow instability zone should be avoided in order to establish a reasonable hot processing system.

Key words： metallic materials Austenitic heat-resisting alloy hot deformation dynamic recrystallization deformation mechanism

收稿日期: 2018-07-03

ZTFLH:

TG142.73

基金资助:“十二五”国家高技术研究发展计划(863计划)(2012AA03A501);江苏省2014年度普通高校研究生科研创新计划(KYLY-1027)

作者简介: 杨雨童，男，1994年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.432 或 https://www.cjmr.org/CN/Y2019/V33/I3/232

表1 试验用材料化学成分

图1 新型AFA合金的流变应力曲线

图2 应变量为0.8、应变速率为0.01 s-1条件下不同变形温度AFA合金的晶粒取向分布

图3 应变量为0.8、变形温度为1050℃时不同应变速率AFA合金的晶粒取向分布

图4 应变量分别在0.3,0.4,0.5及0.6时新型AFA合金的热加工图

图5 在不同变形温度和应变速率条件下应变量与功率耗散因子值之间的关系

图6 新型AFA合金的功率耗散系数峰值区的动态再结晶组织

图7 应变量0.6时新型AFA合金的加工图

图8 变形条件为950℃和5 s-1对应的金相组织

图9 变形条件1150℃、5 s-1和1150℃、0.01 s-1对应的变形组织

图10 新型AFA合金热加工图中的失稳区组织

图11 在950℃和0.01 s-1与1000℃和0.1 s-1条件下的变形组织

图12 新型AFA合金的热变形机理图

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