热处理工艺对高成型性<strong>0.1%C-3%Mn</strong>中锰钢组织和性能的影响

doi:10.11901/1005.3093.2021.300

材料研究学报

2022, Vol. 36

Issue (5): 343-352 DOI: 10.11901/1005.3093.2021.300

研究论文

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热处理工艺对高成型性0.1%C-3%Mn中锰钢组织和性能的影响

周永浪, 王官涛, 王立军(

), 刘春明

东北大学材料科学与工程学院沈阳 110819

Effect of Heat Treatment Process on Microstructure and Properties of a 0.1%C-3% Mn Medium Manganese Steel of High-formability

ZHOU Yonglang, WANG Guantao, WANG Lijun(

), LIU Chunming

School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

周永浪, 王官涛, 王立军, 刘春明. 热处理工艺对高成型性0.1%C-3%Mn中锰钢组织和性能的影响[J]. 材料研究学报, 2022, 36(5): 343-352.
Yonglang ZHOU, Guantao WANG, Lijun WANG, Chunming LIU. Effect of Heat Treatment Process on Microstructure and Properties of a 0.1%C-3% Mn Medium Manganese Steel of High-formability[J]. Chinese Journal of Materials Research, 2022, 36(5): 343-352.

全文: PDF(24548 KB) HTML

摘要:

研究了0.1%C-3%Mn中锰钢的热膨胀模拟相变行为和一步法与二步法ART处理对其显微组织和力学性能的影响。结果表明,二步法ART处理比一步法可产生更多的残留奥氏体,可显著改善钢的成型性能。将实验钢的热轧态试样在740℃预处理后再在660℃~680℃进行ART处理能产生12%~14%的残留奥氏体,使钢的总延伸率高于35%,均匀延伸率高于20%。热处理制度为740℃×0.5 h+670℃×1.0 h的试样具有最佳的综合性能,其屈服强度为470 MPa,抗拉强度为680 MPa,总延伸率为40.7%,均匀延伸率高达25%,冲击吸收功为163 J。

关键词 ：金属材料, 中锰钢, 二步法ART处理, 显微组织, 力学性能, 残留奥氏体

Abstract：

The phase transition behavior of 0.1%C-3%Mn medium manganese steel was studied via thermal simulation with L78RITA automatic phase transformation instrument, meanwhile the effect of one-step and two-step austenite reverted transformation (ART) treatment on the microstructure and mechanical properties of the steel were also investigated. The results show that the two-step ART treatment produces more residual austenite than the one-step ART treatment, which can significantly improve the forming property of the steel. The hot rolled steel samples were pretreated at 740℃ and then heated to different temperatures for ART treatment, and it was found that 12%~14% of the retained austenite could be produced after treatment in temperature range of 660℃~680℃, which made the total elongation higher than 35% and the uniform elongation higher than 20% of the steel respectively. The steel heat treated in conditions of 740℃×0.5 h+670℃×1.0 h has the best comprehensive properties, namely the yield strength is 470 MPa, the tensile strength is 680 MPa, the total elongation is 40.7%, the uniform elongation is up to 25%, and the impact absorption energy is 163 J.

Key words： metallic materials medium manganese steel two-step ART treatment microstructure mechanical properties retained austenite

收稿日期: 2021-05-11

ZTFLH:

TG142

基金资助:国家自然科学基金(51571053)

作者简介: 周永浪,男,1995年生,硕士生

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表1 实验钢的化学成分

图1 实验钢的热轧态显微组织以及热膨胀模拟试样的显微组织和膨胀曲线

图2 在不同温度模拟ART处理1.5 h的实验钢其热膨胀曲线和显微组织

图3 制度为670℃×2.0 h的ART退火处理实验钢的显微组织

图4 二步法ART预处理后实验钢的模拟试样显微组织和冷却过程中的热膨胀曲线

图5 二步法ART处理后实验钢的显微组织

Heat treatment	$V A r$ /%	$C γ$ /%	R_p0.2 /MPa	R_m /MPa	A_t /%	A_u /%	A_kv /J	PSE /GPa·%
740℃×0.5 h+650℃×1.0 h	6.7	0.67	503	668	34.0	17.0	>250	22.71
740℃×0.5 h+660℃×1.0 h	12.5	0.71	492	681	40.7	24.0	>250	27.72
740℃×0.5 h+670℃×1.0 h	14.1	0.70	476	686	40.7	25.0	229	27.92
740℃×0.5 h+680℃×1.0 h	14.4	0.72	487	788	37.3	22.0	163	29.39
740℃×0.5 h→670℃×1.0 h	1.7	0.61	531	1000	20.5	10%	28	20.53

表2 实验钢二步法ART处理组织中的残留奥氏体含量和含碳量及其力学性能

图6 二步法ART处理后实验钢的工程应力-应变曲线

图7 实验钢经740℃×0.5 h+670℃×1.0 h处理后的EBSD图

图8 实验钢经740℃×0.5 h+670℃×1.0 h处理后的TEM照片

图9 实验钢经740℃×0.5 h+670℃×1.0 h处理后的STEM照片和EDS面扫描结果

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