热处理工艺对含硫易切削不锈钢中硫化锰夹杂物的影响

doi:10.13251/j.issn.0254-6051.2020.10.013

摘要/Abstract

摘要： 利用光学显微镜和扫描电镜-能谱仪研究了热处理工艺对含硫易切削不锈钢中硫化锰形貌、长宽比、尺寸及数量的影响。结果表明:试验钢中硫化锰主要沿晶界呈链状或网状聚集分布;在900~1100 ℃范围内,随着温度升高,硫化锰发生熔断碎裂;在1200 ℃热处理后,硫化锰熟化长大,球形及纺锤形硫化锰增多,分布由聚集状逐渐向弥散状转变。在1100 ℃热处理1~3 h,随着时间增加,硫化锰发生熔断碎裂;热处理保温4 h时,硫化锰熟化长大,球形及纺锤形增多,硫化锰由聚集状逐渐向弥散状转变,分布趋于均匀。合适的热处理工艺可以改善含硫易切削不锈钢中硫化锰的形貌、长宽比、尺寸及数量。

关键词: 热处理, 含硫易切削不锈钢, Thermo-calc软件, 硫化锰, 长宽比

Abstract: Effect of heat treatment process on the morphology, length-width ratio, size and number of manganese sulfide in resulfurized free-cutting stainless steel was studied by means of OM and SEM-EDS. The results demonstrate that the manganese sulfide in the tested steel is mainly distributed in chain or network along the grain boundary. At the temperatures ranging from 900 ℃ to 1100 ℃, with the increase of temperature, the manganese sulfide is fused and broken. After 1200 ℃ heat treatment, the manganese sulfide matures and grows up, the globular and spindle-shaped manganese sulfide increases and the distribution changes from aggregation to dispersion. During the heat treatment at 1100 ℃ for 1-3 h, with the increase of time, the manganese sulfide is fused and breaks. After heat treatment for 4 h, the manganese sulfide matures and grows up and the globular and spindle-shaped manganese sulfide increases. The manganese sulfide gradually changs from aggregation to dispersion and the distribution tends to be uniform. The appropriate heat treatment process can improve the morphology, length-width ratio, size and number of manganese sulfide in resulfurized free-cutting stainless steel.

Key words: heat treatment, sulfur containing free-cutting stainless steel, Thermo-calc software, manganese sulfide, length-width ratio

中图分类号:

TG156.1

王英虎. 热处理工艺对含硫易切削不锈钢中硫化锰夹杂物的影响[J]. 金属热处理, 2020, 45(10): 64-69.

Wang Yinghu. Effect of heat treatment process on manganese sulfide inclusions in resulfurized free-cutting stainless steel[J]. Heat Treatment of Metals, 2020, 45(10): 64-69.

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