均匀塑性变形X80管线钢的时效和退火工艺

doi:10.13251/j.issn.0254-6051.2021.08.031

摘要/Abstract

摘要： 从应变时效和退火处理入手,通过设置不同预应变量模拟管材出现均匀塑性变形而未发生颈缩,研究不同热处理方式对预应变X80管线钢性能的影响。研究发现未处理的X80管线钢的拉伸曲线具有连续屈服特征,没有明显的屈服平台,在均匀塑性变形阶段进行预拉伸后管材发生明显加工硬化,屈服强度最大增加值为148 MPa,管材的断后伸长率和形变硬化指数随着预应变量增大出现降低的现象;预应变管材经260 ℃时效处理后其拉伸曲线出现屈服平台,屈服强度继续升高,断后伸长率则持续降低,应变硬化性能未见明显变化;而预应变管材经660 ℃退火处理后其拉伸曲线出现明显屈服平台,屈服强度小于原始管材强度,屈强比、断后伸长率和形变硬化指数等性能参数得到明显改善。

关键词: 管线钢, 均匀塑性变形, 时效, 退火, 应变硬化性能

Abstract: Uniform plastic deformation before necking of the X80 pipe steel was simulated by setting different extent of pre-strains, and the effect of different heat treatment method (strain aging and annealing) on properties of the pipeline steel with such uniform plastic pre-deformation was studied. The results show that tensile curves of the X80 pipeline steel without heat treatment have the feature of continuous yield without obvious yield platform. After pre-tension in the stage of uniform plastic deformation, the pipe has obvious work hardening, and the maximum increment of yield strength reaches 148 MPa. The elongation and strain hardening index of the pipe reduce with the increase of pre-strain. After aging at 260 ℃, the tensile curves of the pre-strain pipe show a yield platform, the yield strength continues to rise, but the elongation continues to decrease, and the strain hardening performance has no obvious change. After annealing at 660 ℃, the tensile curves of the pre-strain pipe show an obvious yield platform, the yield strength is lower than that of the original pipe, and the performance parameters, such as yield ratio, elongation and strain hardening index, are significantly improved.

Key words: pipeline steel, uniform plastic deformation, aging, annealing, strain hardening performance

中图分类号:

TG113.25

许彦, 刘迎来, 李亮, 聂向晖, 丰振军, 郭雷, 刘志鹏. 均匀塑性变形X80管线钢的时效和退火工艺[J]. 金属热处理, 2021, 46(8): 170-173.

Xu Yan, Liu Yinglai, Li Liang, Nie Xianghui, Feng Zhenjun, Guo Lei, Liu Zhipeng. Aging and annealing process of X80 pipeline steel after uniform plastic deformation[J]. Heat Treatment of Metals, 2021, 46(8): 170-173.

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