Yibin REN
,
Ke YANG
,
Bingchun ZHANG
,
Yaqing WANG
,
Yong LIANG
材料科学技术（英文）
BIOSS4 steel is essentially a nickel-free austenitic stainless steel developed by the Institute of Metal Research, Chinese Academy of Sciences, in response to nickel allergy problems associated with nickel-containing stainless steels that are widely used in medical applications. The high nitrogen content of this steel effectively maintains the austenitic stability and also contributes to the high levels of corrosion resistance and strength. BIOSS4 steel possesses a good combination of high strength and toughness, better corrosion resistance, and better blood compatibility, in comparison with the medical 316L stainless steel. Potential applications of BIOSS4 steel can include medical implantation material and orthodontic or orthopedic devices, as well as jewelries and other decorations.
关键词:
Medical stainless steel
,
null
,
null
,
null
,
null
Huayu ZHANG
,
Liangxue LIU
,
Yulei WANG
材料科学技术（英文）
Nitrogen doped diamond-like carbon (DLC:N) films were prepared by electron cyclotron resonance chemical vapor deposition (ECR-CVD) on polycrystalline Si chips. Film thickness is about 50 nm. Auger electron spectroscopy (AES) was used to evaluate nitrogen content, and increasing N2 flow improved N content from 0 to 7.6%. Raman and X-ray photoelectron spectroscopy (XPS) analysis results reveal N-sp3C and N-sp2C structure. With increasing the N2 flow, sp3C decreases from 73.74% down to 42.66%, and so does N-sp3C from 68.04% down to 20.23%. The hardness decreases from 29.18 GPa down to 19.74 GPa, and the Young′s modulus from 193.03 GPa down to 144.52 GPa.
关键词:
Nitrogen doped diamond-like carbon films
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doped
,
diamond-like
,
carbon
,
films
师仲然
,
王瑞珍
,
王青峰
,
苏航
,
柴锋
,
杨才福
钢铁
doi:10.13228/j.boyuan.issn0449-749x.20140459
利用Gleeble-3800模拟焊接粗晶热影响区（CGHAZ）经历的热循环过程。比较了热输入100 kJ/cm条件下， V钢、V-N钢、V-Ti钢和V-N-Ti钢CGHAZ的组织和韧性，并分析了析出相情况。结果表明，CGHAZ的韧性从高到低依次为V-N-Ti钢、V-Ti钢、V-N钢和V钢；在V钢成分基础上添加钛可以有效细化原始奥氏体晶粒尺寸；V-Ti钢成分基础上增氮，一方面促进了（Ti，V）（C，N）/TiN的析出，抑制了原始奥氏体晶粒的粗化；另一方面促进了V（C，N）的析出，其促进了多边形铁素体的形成；多边形铁素体数量的增加能够减弱自由氮对韧性的破坏，同时有效改善了CGHAZ韧性。
关键词:
钒微合金钢
,
粗晶热影响区
,
氮
,
多边形铁素体
,
韧性
邱国兴
,
战东平
,
姜周华
,
张慧书
,
董大西
,
杨峰功
上海金属
1 873 K下,MoSi2电阻炉上用φ70 mm×100 mm MgO坩埚,以SG45VCM钢为研究对象,对不同压力下(33、66、100 kPa)气相渗氮过程及脱氮过程中氮的溶解行为进行了研究.分别建立了相应的热力学及动力学模型,并在实验室进行了验证.实验发现,氮分压越大溶解度越大,吹氮25 min后钢液中氮达到饱和,吹氩脱气40 min后,钢中氮的质量分数在100×10-6以下.工业试验表明,60 t LF+ VD精炼炉底吹氮气后钢中增氮效果稳定.在LF精炼底吹氩气压力1 ～ 1.5 MPa、流量300～400 Nl/min条件下吹氮20～30 min后切换成氩气,VD保真空5～10 min的冶炼工艺条件下,可不添加任何氮化合金,即可生产满足氮含量要求的产品.
关键词:
SG45VCM钢
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氮合金化
,
LF+ VD精炼
,
氮气
