低Ni/Cu比钢中铜的富集行为  

Copper enrichment behavior in copper-containing steel with low Ni/Cu ratio

作　　者：刘锟[1] 李飞[1] 吴耐[2] 郭佳[1] 朱国森[1] 李明[2] 

机构地区：[1]首钢技术研究院薄板所,北京100043 [2]首钢迁安钢铁有限责任公司,河北迁安064404

出　　处：《金属热处理》2012年第5期29-34,共6页Heat Treatment of Metals

摘　　要：采用热重分析仪和扫描电镜研究了不同加热温度和升温速率下Ni/Cu比为0.39的低Ni/Cu比含铜钢铜富集行为。研究结果表明:在1050～1300℃加热温度范围内,富集相以富Cu-Ni相和富Ni相为主,且以颗粒形式弥散分布于氧化皮内部或氧化皮与钢基体界面;除1250℃外,随加热温度升高,富集相中Ni/Cu比值逐渐增加,在1200℃和1300℃时,富集相仅为富Ni相。加热温度为1250℃时,升温速率不同,富集相的Ni/Cu比值和氧化皮与钢基体界面形态不同:采用5℃/min低速升温和15℃/min高速升温均有利于增加Ni/Cu比值,而采用10℃/min中速升温导致Ni/Cu比值偏低;增加升温速率,缩短加热时间,使氧化皮与钢基体界面更加平滑,有利于除鳞以改善钢材表面质量。对生产高表面质量低Ni/Cu比含铜钢而言,可采取低温加热或高温加热,将加热温度分别控制在1180～1220℃或者1280～1320℃;也可采用1220～1280℃中温加热,将弱氧化性气氛下分阶段步进梁加热炉的第三阶段升温速率控制在15℃/min左右。The copper enrichment behavior in copper-containing steel with low Ni/Cu ratio of 0.39 was investigated under the conditions of different heating temperatures and heating rates by using thermogravimetric analysis （TGA） and scanning electron microscopy （SEM）. The results show that there are rich phases including mainly copper-nickel-rich phase and nickel-rich phase dispersed as particles in the interior of oxide scale or on the interface of oxide scale and steel substrate heated at 1050 ~ 1300 ℃. Excepting at 1250 ℃, with increasing heating temperature, Ni/Cu ratio in the rich phases increases gradually, and the rich phases are only nickel-rich phase at 1200 ℃ and 1300 ℃. When the heating temperature is 1250 ℃ , the Ni/Cu ratio of rich phases and the interface morphology of oxide scale and steel substrate are varied with heating rates. It is in favor of Ni/Cu ratio increasing at the lower heating rate of 5 ℃/min or the higher heating rate of 15 ℃/ min, while the Ni/Cu ratio decreases at the heating rate of 10 ℃/rain. The interface of oxide scale and steel substrate will become smooth when increasing heating rate and shortening the heating time which is convenient for descaling and improving the surface quality of steel. For producting copper-containing steel with low Ni/Cu ratio and high surface quality, the heating temperature of 1180 - 1220 ℃ or 1280 1320 ℃ can be adopted, and when the heating temperature of 1220 - 1280 ℃ is adopted, the heating rate should be controlled about 15 ℃/min in the third stage of walking beam furnace under weak oxidizing atmosphere.

关 键 词：含铜钢 Cu-Ni相 铜富集 铜扩散 铜脆 

分 类 号：TG142.1[一般工业技术—材料科学与工程]