退火温度对冷轧中锰钢组织性能和断裂行为的影响

doi:10.13228/j.boyuan.issn0449749x.20190073

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摘要为了系统研究临界区退火和全奥氏体区退火对中锰钢性能的影响，为中锰钢的实际应用提供理论基础，在650~900 ℃范围内系统研究了冷轧中锰钢的显微组织和力学性能，并通过断口形貌观察分析了试验钢的断裂特性。结果表明，试验钢在临界区退火的综合力学性能明显优于全奥氏体区退火。650~750 ℃退火时，抗拉强度在1 000 MPa左右，强塑积超过30 GPa·%，发生韧性断裂，宏观上可以观察到明显的层状裂纹，微观下为大量韧窝；在800~900 ℃退火时，抗拉强度在743~1 154 MPa范围内波动较大，强塑积不足10 GPa·%，断口平整，发生脆性沿晶断裂；退火温度为650 ℃时，组织为片层状和等轴状的奥氏体、铁素体双相及大量渗碳体；随着退火温度的升高，渗碳体逐渐溶解消失，等轴状组织所占体积分数明显增加，奥氏体体积分数也不断增加，在750 ℃时达到52.2%；退火温度为800 ℃时，有马氏体产生，奥氏体体积分数下降；退火温度为900 ℃时，组织基本为马氏体，残留奥氏体体积分数仅为14.6%。

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	杨丽芳
	魏焕君
	孙力
	信瑞山
	马成
	潘进

关键词 ：冷轧中锰钢 , 退火工艺 , 微观组织 , 力学性能 , 断口形貌

Abstract： To systematically study the effects of intercritically annealing and austenite reverted transformation annealing on the properties of mediumMn steel and provide the theoretical basis for its practical application，effects of annealing temperature in a range of 650-900 ℃ on microstructures，mechanical properties and fracture behavior were studied for a coldrolled mediumMn steel. The results show that the comprehensive mechanical properties of specimen after intercritical annealing were obviously superior to the specimen by austenite reverted transformation annealing. When annealed at 650-750 ℃，the tensile strength of about 1 000 MPa and product of strength and ductility of above 30 GPa·% were obtained. The fracture exhibits distinct layerlike cracks and massive dimples. When the annealing temperatures were 800-900 ℃，the tensile strength fluctuates greatly in the range of 743-1 154 MPa while the products of strength and ductility were below 10 GPa·%. Meanwhile，the brittle intergranular fracture occurred due to the poor elongation and the fracture surfaces were flat. Annealed at 650 ℃，the microstructures consist of equiaxed/lamellar ferrite and austenite，as well as abundant cementite. With increasing temperature，the cementite gradually dissolved and disappeared，and the volume percent of austenite and equiaxed grains increased. When the annealing temperature was 750 ℃，52.2% austenite was obtained. Martensite was generated at 800 ℃. With further increasing annealing temperature，austenite volume percent decreased，and only 14.6% austenite was retained at 900 ℃.

Key words： coldrolled mediumMn steel； annealing； microstructure； mechanical property； fracture morphology

收稿日期: 2019-02-26 出版日期: 2019-11-15

引用本文:

杨丽芳，魏焕君，孙力，信瑞山，马成，潘进. 退火温度对冷轧中锰钢组织性能和断裂行为的影响[J]. 钢铁, 2019, 54(11): 80-87. YANG Lifang1，WEI Huanjun2，SUN Li1，XIN Ruishan1，MA Cheng1，PAN Jin1. Effect of annealing temperatures on microstructures，mechanical #br# properties and fracture behavior of a coldrolled mediumMn steel. Iron and Steel, 2019, 54(11): 80-87.

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