化学成分和退火温度对低合金高强钢组织性能的影响  

Effect of chemical composition and annealing temperature on microstructure and properties of high strength low alloy steel

作　　者：程帅 吕超杰 王风强 王田惠 张银普 贾丽英 CHENG Shuai;LU Chaojie;WANG Fengqiang;WANG Tianhui;ZHANG Yinpu;JIA Liying(Technology center of Handan Co.,Ltd.,HBIS Group,Handan 056015,China)

机构地区：[1]河钢股份有限公司邯郸分公司技术中心,河北邯郸056015

出　　处：《轧钢》2024年第3期42-47,共6页Steel Rolling

摘　　要：为进一步降低低合金高强钢的生产成本,研究了不同Nb、Mn元素含量和退火温度对低合金高强钢组织性能的影响。结果表明:退火温度的高低对低合金高强钢铁素体晶粒尺寸无明显影响,但较高的退火温度不利于珠光体组织的形成,使得铁素体中固溶C含量较高,应力-应变曲线易出现屈服平台,且NbC析出物粗化长大行为导致产品强度降低;低合金高强钢中带状组织的形成主要与C元素的扩散行为有关,较高的退火温度有利于减轻带状组织的程度;当Nb质量分数由0.014%增至0.021%时,细晶强化效果及和析出强化效果明显增强,低合金高强钢的强度水平明显提高;Mn元素在低合金高强钢中主要起到固溶强化的作用。In order to further reduce the production cost of high strength low alloy steel(HSLA),the effects of different contents of Nb,Mn and annealing temperature on the microstructure and properties of HSLA steel were studied.The results show that the annealing temperature has no obvious effect on the ferrite grain size of HSLA steel,but the higher annealing temperature is not conducive to the formation of pearlite structure,resulting in a higher content of solid solution C in ferrite,a yield platform in stress-strain curve,and the coarsening behavior of NbC precipitates leads to a decrease in strength of the product.The formation of banded structure in HSLA steel is mainly related to the diffusion behavior of C element,and higher annealing temperature is beneficial to reduce the degree of banded structure.When the mass fraction of Nb increases from 0.014%to 0.021%,the effect of fine grain strengthening and precipitation strengthening is obviously enhanced,and the strength level of HSLA steel is obviously increased.Mn element mainly plays a solid solution strengthening effect in HSLA steel.

关 键 词：化学成分 退火温度 低合金高强钢 显微组织 力学性能 低成本 

分 类 号：TG142.33[一般工业技术—材料科学与工程]