同素异构转变对退火态<strong>Fe-15Mn-10Al-0.3C</strong>双相钢塑性的影响

doi:10.11901/1005.3093.2019.136

材料研究学报

2019, Vol. 33

Issue (11): 837-847 DOI: 10.11901/1005.3093.2019.136

研究论文

本期目录 | 过刊浏览

同素异构转变对退火态Fe-15Mn-10Al-0.3C双相钢塑性的影响

刘营凯^1,²,王白冰^1,²,刘仁东³,郭金宇³,史文^1,²(

)

1. 上海大学材料科学与工程学院上海 200444
2. 省部共建高品质特殊钢冶金与制备国家重点实验室上海 200444
3. 鞍钢股份有限公司技术中心鞍山 114009

Effect of Allotropic Transformation on Plasticity of Fe-15Mn-10Al-0.3C Dual Phase Steel during Annealing

LIU Yingkai^1,²,WANG Baibing^1,²,LIU Rendong³,GUO Jinyu³,SHI Wen^1,²(

)

1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2. State Key Laboratory of Advanced Special Steel, Shanghai 200444, China
3. Technology Center of Ansteel Institute, Anshan 114009, China

引用本文:

刘营凯,王白冰,刘仁东,郭金宇,史文. 同素异构转变对退火态Fe-15Mn-10Al-0.3C双相钢塑性的影响[J]. 材料研究学报, 2019, 33(11): 837-847.
Yingkai LIU, Baibing WANG, Rendong LIU, Jinyu GUO, Wen SHI. Effect of Allotropic Transformation on Plasticity of Fe-15Mn-10Al-0.3C Dual Phase Steel during Annealing[J]. Chinese Journal of Materials Research, 2019, 33(11): 837-847.

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摘要:

将经过不同冷轧处理的Fe-15Mn-10Al-0.3C钢在900℃退火，使用SEM、XRD以及EBSD等手段研究了退火过程中钢的组织和性能的演变。结果表明：在退火过程中冷轧钢的奥氏体带发生了同素异构转变，γ相转变为α相，且转变量随着退火时间的延长而增加；同素异构转变影响退火试样的拉伸变形行为。随着退火时间延长α相和γ相的取向从近邻关系到满足K-S，有利于位错穿过相界滑移，使塑性提高；对于退火时间足够长的冷轧钢，两相之间的K-S关系失去相关性，塑性下降。通过该转变能调控α-铁素体与γ-奥氏体之间滑移系的平行程度，改善Fe-Mn-Al-C钢的塑性。

关键词 ：金属材料, 同素异构转变, 二次冷轧, 位向关系, 位错滑移

Abstract：

The evolution of microstructure and properties of Fe-15Mn-10Al-0.3C steel during static annealing after different cold rolling treatments was investigated. The microstructure and properties of the test steel were characterized by means of SEM, XRD and EBSD. The results show that during the annealing process, the austenite bands undergo obvious allotropic transformation, whilst γ-phase transforms to α-phase and the amount of transformation increases with annealing time. The isomeric transformation affects the tensile deformation behavior of the annealed steel, the orientation relationship between the α-phase and the γ-phase changed from the neighbor relationship to the K-S with the prolongation of annealing time, which is beneficial to dislocation sliding across phase boundary and improves plasticity. When the annealing time is long enough, the K-S relationship between the two phases loses coherent and the plasticity is reduced. The transformation can regulate the parallelism of the slip system between the α-ferrite and the γ-austenite, which can improve the plasticity of Fe-Mn-Al-C steel.

Key words： metallic materials allotropic transformation double cold rolling orientation relationship dislocation glide

收稿日期: 2019-03-01

ZTFLH:

TG142.1+4

作者简介: 刘营凯，男，1993年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.136 或 https://www.cjmr.org/CN/Y2019/V33/I11/837

表1 Fe-15Mn-10Al-0.3C实验钢的化学成分(质量分数)

图1 使用Thermo-calc软件计算出的Fe-15Mn-10Al-0.3C钢相分数随温度的变化

图2 Fe-15Mn-10Al-0.3C实验钢的热处理工艺

图3 Fe-15Mn-10Al-0.3C实验钢淬火态和冷轧态的微观组织

图4 Fe-15Mn-10Al-0.3C实验钢一次冷轧后在900℃退火不同时间后的微观组织

图5 一次冷轧试样在 900℃退火后的晶界角度分布、相图和反极图

图6 Fe-15Mn-10Al-0.3C实验钢二次冷轧后在900℃退火不同时间的微观组织

图7 冷轧及退火态试样的XRD谱和同素异构转变统计图

图8 实验钢冷处理后退火不同时间的室温拉伸性能

表2 退火态试样的室温力学性能

图9 退火不同时间试样中奥氏体相的体积分数和平均晶粒尺寸

图10 退火试样拉伸前后平均位错密度的绝对增量和相对增量

图11 退火态试样α-铁素体的晶粒取向变化

表3 退火态试样中所选取不同位置的α-铁素体和γ-奥氏体的欧拉角

图12 退火试样中α相与γ相之间偏离K-S关系图以及两相滑移系平行关系的占比变化趋势

图13 拉伸试样断口处微裂纹的SEM照片

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