SiCr系弹簧钢热处理钢丝奥氏体晶粒度检验方法

doi:10.13228/j.boyuan.issn1001-0777.20220052

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Abstract SiCr spring steel heat-treated wire was used as the sample. The austenite grain size was tested by direct hardening method and oxidation method. In the direct hardening method for the test of austenite grain size of SiCr spring steel heat-treated wire, the sample was etched with 4% nitric acid alcohol solution. The results showed that the appearance of martensite could not be restrained, leading to the unclear austenite grain boundary when observed under a microscope. As a result, the grade of austenite grain size could not be accurately determined. For the oxidation method, the austenite grain boundary of spring steel heat-treated wire was clear under the microscope. The heating temperature was adjusted by measuring the phase transition temperature and phase transition kinetic curve. The holding time of temperature was determined according to the sample size. The optimal heat treatment process for SiCr spring steel was heating at 810 ℃ for 30 min, and it could be close to the austenitic grain size in real spring steel heat-treated wire. This study could guide the technological breakthrough of heat treatment in spring wire drawing plant to improve the performance of spring steel wire.

Key words： spring steel austenite grain size direct hardening method oxidation method

Received: 20 July 2022

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	Articles by authors
	JIN Tao
	SUN Fengyuan
	WANG Haihua
	ZHANG Jianfeng
	ZHENG Xiaowei

Cite this article:

JIN Tao,SUN Fengyuan,WANG Haihua等. Test method of austenite grain size of SiCr spring steel heat-treated wire[J]. PHYSICS EXAMINATION AND TESTING, 2023, 41(4): 15-19.

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http://www.chinamet.cn/Jweb_wlcs/EN/10.13228/j.boyuan.issn1001-0777.20220052 OR http://www.chinamet.cn/Jweb_wlcs/EN/Y2023/V41/I4/15

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