高延伸膨胀管用钢的力学性能及微观组织

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摘要采用低碳低合金的成分设计开发了一种新型的膨胀管用钢。经优化的（α+γ）两相区退火工艺处理后，钢材呈现出强度高、延伸性能好、加工硬化能力强、冲击韧性以及高温力学性能优良等特点。常温条件下，该膨胀管材料的抗拉强度超过了700MPa，伸长率超过了40%，强塑积达到了30GPa·%，半厚冲击韧性超过了50J；300℃高温条件下，该类钢仍具有620MPa以上的抗拉强度，40%以上的伸长率以及25GPa·%以上的强塑积。采用SEM和XRD对材料的微观组织进行了表征，该类钢具有马氏体+残余奥氏体+铁素体的多相组织结构形貌。由于弥散分布的小尺寸残余奥氏体在形变过程中的TRIP效应，使得该类钢种在拉伸过程中获得了持续加工硬化的能力，从而获得了强度与塑性的优良结合。

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	任勇强
	尚成嘉
	陈二虎
	袁胜福

关键词 ：膨胀管, 两相区退火, 多相组织, 高延伸率, 加工硬化, 强塑积

Abstract：Making use of the low-carbon and low-alloy component, the new expandable tubular steel was designed. After the optimized α+γ zone annealing treatment, the following properties of steel can be obtained, such as high strength, high elongation, high work hardening ability and good impact ability. And the Mechanical properties under high temperature are also good. At room temperature, tensile strength of the material is more than 700MPa, elongation of it is more than 40%, the products of tensile strength and total elongation of it is more than 30GPa·% and half thickness size impact toughness of it is higher than 50J. At 300℃ high temperature, tensile strength of it is still more than 620MPa, elongation of it is more than 40%, products of tensile strength and total elongation of it is also more than 25GPa·%. By means of SEM and XRD, microstructures of this kind of steel were characterized. The results show that this kind of steel exhibits a multi-phase microstructure including martensite, retained austenite and ferrite. Due to the TRIP effect of the widely distributed small size retained austenite, the sustainable work hardening ability can be obtains, and the good combination of high strength and good plasticity can be achieved.

收稿日期: 2013-08-30 出版日期: 2014-04-28

PACS:

TG142.1

引用本文:

任勇强，陈二虎，宋婷婷，袁胜福尚成嘉. 高延伸膨胀管用钢的力学性能及微观组织[J]. 钢铁, 2014, 49(4): 63-68. REN Yong-qiang,CHEN Er-hu,SONG Ting-ting,YUAN Sheng-fu,SHANG Cheng-jia. Mechanical Properties and Microstructures of High Elongation Steel Used for Expandable Tubular. Iron and Steel, 2014, 49(4): 63-68.

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http://www.chinamet.cn/Jweb_gt/CN/ 或 http://www.chinamet.cn/Jweb_gt/CN/Y2014/V49/I4/63

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