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一种高强度低合金贝氏体钢高温回火析出的极细MC相 被引量:1

Ultra-Fine MC-Type Precipitates Formed During High Tempering in a High-Strength Low-Alloy Bainitic Steel
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摘要 将一种直径为100:mm的高强度低合金贝氏体圆钢,于980℃奥氏体化1 h水淬,切割成试片,然后进行620℃×0.5 h回火处理。采用透射电子显微镜(TEM)和三维原子探针分析技术(3:DAP)详细研究了钢的淬火态组织和碳化物析出相。结果,钢的淬火态组织为上、下贝氏体和马氏体,回火后,主要析出相是三种合金碳化物:(1)θ-M_3C型渗碳体,其大小为50 nm以下,主要分布在板条铁素体晶界;(2)铁素体板条内析出的针形ε-M_2C型碳化物,宽度小于20 nm,长度小于200 nm,分布较均匀;(3)铁素体板条内析出的约2 nm大小的高密度MC型碳化物。此外,论述了三种析出相对材料性能可能的影响。 A bar steel 100 mm in diameter, made of high-strength low-alloy bainitie steel, was austenitized at 980 ℃ for 1 h and quenched in water, cut into test pieces, and then tempered at 620 ℃ for 30 rain. As-quenched mierostrueture and various precipitated carbides in the steel were investigated in detail by using TEM and threedimensional atom probe (3DAP). The results indicate that as-quenched microstructure of the steel consists of upper beinite, lower beinite and martensite ; and that there are three categories of alloy carbide were observed in the steel tempered : ( 1 ) θ-M3 C eementite as size as less than 50 nm, essentially lies in lath ferrite boundaries ; (2) aeicular ε-M2C carbide, which precipitates in lath ferrite of the steel, is as size as less than 20 nm wide by less than 200 nm long, and exhibits uniform distribution; (3) highly dense MC era-bide as size as about 2 nm. Beyond this, the possible effect of the three types of precipitates on mechanical properties of the steel was discussed.
出处 《热处理》 CAS 2016年第4期9-17,共9页 Heat Treatment
基金 国家自然科学基金项目51271200资助
关键词 贝氏体钢 碳化物 微观结构 三维原子探针 透射电镜 R5级海洋系泊链 bainitie steel carbide microstructure three-dimensional atom probe (3DAP) TEN R5 grade offshore mooring chain
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