高强线材等温铅浴热模拟研究
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摘要
对一种高强线材进行了等温铅浴热模拟,利用金相显微镜、扫描电镜、显微硬度测试等手段研究了等温铅浴过程中的显微组织、珠光体片层间距和显微硬度的变化。结果表明,随着等温温度降低,材料的索氏体明显增多,珠光体片长度变短,珠光体域的边界更模糊;珠光体片层的倒数与过冷度呈近似线性关系。要保证珠光体片层约120 nm,对应的保温温度约653℃。
Hot simulation of isothermal lead bath for a high strength wire rod was carried out. Changes of microstructure,lamellae spacing and microhardness of pearlite in the isothermal lead bath process were studied by means of optical microscope, scanning electron microscope and micro-hardness test. The results show that with the decrease of the isothermal temperature, the sorbite in the material increases obviously, the length of the pearlite lamellae becomes shorter and the boundary of pearlite domain is more obscure; the relationship between the reciprocal of pearlite lamellae and the degree of super cooling is approximate linear. To ensure that the pearlite layer is about 120 nm, the corresponding holding temperature is about 653 ℃.
Hot simulation of isothermal lead bath for a high strength wire rod was carried out. Changes of microstructure,lamellae spacing and microhardness of pearlite in the isothermal lead bath process were studied by means of optical microscope, scanning electron microscope and micro-hardness test. The results show that with the decrease of the isothermal temperature, the sorbite in the material increases obviously, the length of the pearlite lamellae becomes shorter and the boundary of pearlite domain is more obscure; the relationship between the reciprocal of pearlite lamellae and the degree of super cooling is approximate linear. To ensure that the pearlite layer is about 120 nm, the corresponding holding temperature is about 653 ℃.
引文
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[2]叶觉明.缆索用钢丝的断丝问题[J].钢结构,2003(2):35-36.
[3]Nakamura S,suzumura K.Experimental study on fatigue strength of corroded bridge wires[J].Journal of Bridge Engineering,2012,17(14):720-727.
[4]万宝田.桥梁缆索用高强度镀锌钢丝[J].世界桥梁,2005(1):62-66.
[5]Aimin Guo,Misra R D K,Xu Jingqiao,et al.Ultrahigh strength and low yield ratio of niobium-microalloyed 900 MPa pipeline steel with nano/ultrafine bainitic lath[J].Materials Science and Engineering A,2010,527:3886-3892.
[6]廖波,肖福仁.针状铁素体管线钢组织及强韧化机理研究[J].材料热处理学报,2009,30(2):57-62.
[7]Lee S K,Ko D D,Kim B M.Pass schedule of wire drawing process to prevent delamination for high strength steel cord wire[J].Material and Design,2009,30:291-292.