机械抛光后的时效工艺对0Cr25Al5电热合金拉拔性能的影响

doi:10.13251/j.issn.0254-6051.2022.04.028

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 171-177.DOI: 10.13251/j.issn.0254-6051.2022.04.028

机械抛光后的时效工艺对0Cr25Al5电热合金拉拔性能的影响

胡静, 陶科, 杨庆松, 李刚, 张德汉

北京首钢吉泰安新材料有限公司, 北京 102206

收稿日期:2021-12-24 修回日期:2022-01-26 出版日期:2022-04-25 发布日期:2022-05-19
作者简介:胡静(1986—),女,硕士,主要研究方向为免酸洗及拉拔工艺,E-mall:hujing081223@163.com

Effect of aging after mechanical polishing process on drawing performance of 0Cr25Al5 electrothermal alloy

Hu Jing, Tao Ke, Yang Qingsong, Li Gang, Zhang Dehan

Beijing Shougang Jitaian New Material Co., Ltd., Beijing 102206, China

Received:2021-12-24 Revised:2022-01-26 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 对机械抛光后的0Cr25Al5电热合金进行了不同温度(150、250、350 ℃)和不同时间(1、2、3 h)的时效处理,并与抛光前后的力学性能、显微组织以及析出相进行了对比。结果表明:0Cr25Al5电热合金机械抛光后有析出相Cr₃C₂析出,集中于晶界处分布,其形状以棒状、针状为主,并伴有少量球状析出相;机械抛光后再经250 ℃×1 h时效处理时的硬度下降,抗拉强度略有上升、伸长率略有下降,残余应力明显降低,晶粒度大小不变,析出相基本为球形,尺寸较小,分布较为集中且多分布于晶界,为析出相Cr₃C₂溶解并以离位析出的方式重新形成的Cr₇C₃,同时由于时效温度较低,氧化膜无再生现象,符合后续拉拔工艺要求。与未时效相比,经250 ℃×1 h时效处理的0Cr25Al5电热合金在后续拉拔过程的模具损耗、断丝率均明显下降,成材率上升。

关键词: 铁铬铝合金, 机械抛光, 时效处理, 析出相

Abstract: Mechanical properties, microstructure and precipitates of mechanically polished 0Cr25Al5 Fe-Cr-Al electrothermal alloy after aging at different temperatures (150, 250, 350 ℃) and different time (1, 2, 3 h) were studied, and compared with those before and after mechanically polishing. The results show that after mechanical polishing, Cr₃C₂ is precipitated and distributed at the grain boundary with mainly rod-like and needle-like shape, accompanied by a small amount of spherical precipitates. After mechanical polihsing and then aging at 250 ℃ for 1 h, the hardness decreases, the tensile strength slightly increases, the elongation slightly decreases and the residual stress significantly decreases, meanwhile, the grain size remains the same and the precipitates is basically spherical with small size and distribution concentrated on grain boundaries, which is the Cr₇C₃ re-formed by exostatic precipitation from the dissolved Cr₃C₂. In addition, the oxide film does not regenerate which meets the requirements of subsequent drawing process. During the subsequent cold drawing production, the die loss and wire breakage rate of the 0Cr25Al5 Fe-Cr-al alloy after aging at 250 ℃ for 1 h decrease significantly comparing with that without aging treatment, and the finished product rate increases.

Key words: Fe-Cr-Al alloy, mechanical polishing, aging treatment, precipitated phase

中图分类号:

TG146.1⁺1

胡静, 陶科, 杨庆松, 李刚, 张德汉. 机械抛光后的时效工艺对0Cr25Al5电热合金拉拔性能的影响[J]. 金属热处理, 2022, 47(4): 171-177.

Hu Jing, Tao Ke, Yang Qingsong, Li Gang, Zhang Dehan. Effect of aging after mechanical polishing process on drawing performance of 0Cr25Al5 electrothermal alloy[J]. Heat Treatment of Metals, 2022, 47(4): 171-177.

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机械抛光后的时效工艺对0Cr25Al5电热合金拉拔性能的影响

Effect of aging after mechanical polishing process on drawing performance of 0Cr25Al5 electrothermal alloy

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