Yibin Ren
材料科学技术（英）
Most commercialized coronary stents are made of 316L stainless steels due to its good combination of properties, and currently some new stents are made of cobalt-based alloy owing to its higher mechanical properties. However, the presence of high quantity of nickel and/or cobalt elements in these materials, which are known to trigger the toxic and allergic responses, has caused many concerns. Nickel-free austenitic stainless steels have been developed in order to solve these problems. In this paper, based on the development of a new Fe-Cr-Mn-Mo-N type high nitrogen nickel-free austenitic stainless steel, properties such as mechanical property, corrosion resistance in Hank0s solution, and in vitro blood compatibility including the kinetic clotting time and the platelets adhesion, were investigated in comparison to the above two conventional materials, a 316L stainless steel and a Co-28Cr-6Mo alloy. The results showed that the new high nitrogen steel possessed better combination of mechanical properties, corrosion resistance and blood compatibility than those of 316L steel and the Co-28Cr-6Mo alloy, and can be a promising alternative material for manufacture of coronary stents.
关键词:
Coronary stents
Yibin Ren
材料科学技术（英）
Most commercialized coronary stents are made of 316L stainless steels due to its good combination of properties, and currently some new stents are made of cobalt-based alloy owing to its higher mechanical properties. However, the presence of high quantity of nickel and/or cobalt elements in these materials, which are known to trigger the toxic and allergic responses, has caused many concerns. Nickel-free austenitic stainless steels have been developed in order to solve these problems. In this paper, based on the development of a new Fe-Cr-Mn-Mo-N type high nitrogen nickel-free austenitic stainless steel, properties such as mechanical property, corrosion resistance in Hank0s solution, and in vitro blood compatibility including the kinetic clotting time and the platelets adhesion, were investigated in comparison to the above two conventional materials, a 316L stainless steel and a Co-28Cr-6Mo alloy. The results showed that the new high nitrogen steel possessed better combination of mechanical properties, corrosion resistance and blood compatibility than those of 316L steel and the Co-28Cr-6Mo alloy, and can be a promising alternative material for manufacture of coronary stents.
关键词:
Coronary stents
汤旭炜
,
朱荣
,
李超
,
刘伟
钢铁研究学报
doi:10.13228/j.boyuan.issn1001-0963.20140173
对电渣重熔制备高氮钢的脱硫过程进行了研究,分别采用不同渣系和熔炼速率对高氮钢进行制备.对电渣重熔前后夹杂物进行电镜及成分分析,分析结果表明:硫化物夹杂的平均直径和单位面积数量大大减少,夹杂物的主要类型为MnS+ Al2O3复合型夹杂物;适度提高渣中CaO含量可提高硫分配比,是提高脱硫效率的有效手段.同时,实验结果表明重熔速率对电渣重熔中的脱硫率具有重要影响.通过脱硫动力学推导,发现重熔速率越低,脱硫效果越明显,但实验发现脱硫率随重熔速率的降低有时呈现先降低后升高的趋势,其原因在于渣池中发生硫化物富集,导致“回硫”现象发生,降低了脱硫率.
关键词:
高氮钢
,
渣系
,
脱硫率
,
硫分配比
,
动力学
崔辰硕
,
高彩茹
,
杨雄飞
,
杜林秀
,
陈宇轩
钢铁钒钛
doi:10.7513/j.issn.1004-7638.2015.06.008
低碳钢由于碳含量较低,可以减轻碳对钢韧性的不利影响.低碳钢通过控轧控冷工艺得到含高位错密度的贝氏体组织,可以实现相变强化.但单纯依靠一种强化手段其强化效果有限.为进一步提升性能,希望在贝氏体相变强化基础上,引入析出强化机制.通过热模拟试验,结合透射电镜观察,研究了高N含钒微合金钢在贝氏体区的析出行为,得出了不同温度、不同时间下析出体积分数的具体数值、强化贡献量及最佳析出温度,为V-N贝氏体钢开发提供有价值的参考.
关键词:
钒
,
高N钢
,
微合金钢
,
析出行为
,
贝氏体
王书桓
,
刘吉猛
,
赵定国
,
黄凯
,
李伟峰
钢铁钒钛
doi:10.7513/j.issn.1004-7638.2015.03.20
针对冶炼Cr12N铁素体不锈钢时有气泡产生的现象.用蔡司显微镜对冶炼出的钢锭进行观察并采用图像分析软件对得到的图片进行分析处理,得到气泡的分布规律.结果表明:当熔炼压力0.6 MPa时,凝固压力由1.0MPa增加到1.6 MPa,气泡数量的平均值由46.37个/mm2降到9.46个/mm2;直径大于20 μm的气泡数量下降到原来的17.4％,而直径小于5μm的气泡数量增加了37.7％;但随着凝固压力的增加,气泡面积百分比越来越小.在熔炼压力0.3 MPa凝固压力1.6 MPa条件下得到的钢锭,其下表面的气泡平均面积含量比例是上表面气泡含量的23.9％,边缘位置处的气泡平均面积含量比例是中心位置处的25.9％.
关键词:
高氮钢
,
高压凝固
,
Cr12N钢
,
气泡
王松涛
,
杨柯
,
单以银
,
李来风
金属学报
本文通过对氮含量为1.2%的高氮奥氏体不锈钢施加不同变形量的压缩变形，研究了冷变形对钢组织和力学行为的影响。研究结果表明，实验钢在最高变形量达到56%的冷变形过程中未发现有α’马氏体形成。变形初期时钢中孪晶和滑移共同参与变形，孪晶对滑移有强烈的阻碍作用。随变形量的增加，孪晶受到滑移线的切割，孪晶界逐渐模糊。高氮钢的加工硬化指数随变形量增加而降低。当冷变形至56%时，钢的屈服强度提高了2倍左右，抗拉强度提高了1倍左右，分别达到1645MPa和1870MPa。通过对比分析氮在几种奥氏体不锈钢中的作用，认为氮通过短程有序而非降低层错能的方式促进位错的平面滑移，提高钢的加工硬化能力。
关键词:
高氮钢
,
cold deformation
,
microstructure
,
mechanical properties
,
null
金光秀
,
高彩茹
,
杨雄飞
,
杜林秀
,
崔辰硕
,
陈宇轩
材料热处理学报
通过热模拟实验,就高氮微合金钒钢在贝氏体区的析出行为进行了研究.给出了析出量的定量分析结果为:在450～550℃区间保温,贝氏体中析出物平均粒径4.5 nm,析出的粒子长大趋势不明显,开始析出时间(5％体积分数)分别为630、574、409 s;保温时间6000 s时,最大析出量能够达到理论析出量的16％.
关键词:
高氮钢
,
微合金钒钢
,
贝氏体
,
析出行为
陈巍
,
刘燕林
,
齐志望
,
宗铎
,
贺勇
,
吕绯
兵器材料科学与工程
doi:10.3969/j.issn.1004-244X.2009.06.015
研究氮含量为0.56%的不同厚度规格的高氮奥氏体装甲钢抗穿、破甲弹侵彻时的抗弹性能、冲击硬化、抗弹机理等现象,以防护系数的优劣作为评定依据.试验结果表明,高氮钢可产生明显的冲击硬化现象,具有优良的抗弹性能和综合性能,高的防护系数使其可作为优良的防护材料.
关键词:
高氮钢
,
冲击硬化
,
抗弹性能
