Carburization resistance of austenitic stainless steel tubes
    1.
    发明授权
    Carburization resistance of austenitic stainless steel tubes 失效
    奥氏体不锈钢管的耐渗碳性

    公开(公告)号:US4424083A

    公开(公告)日:1984-01-03

    申请号:US453451

    申请日:1982-12-27

    IPC分类号: C10G9/20 C21D8/10 C22F1/11

    摘要: Protection of cast austenitic stainless steel tubes is provided against initiation of carburization by (a) cold-working the inner surfaces of said tubes to deform the surface to such a degree that upon the subsequent heat treatment of step (b) below, dissolution of the M.sub.23 C.sub.6 carbides in the deformed region is accompanied by recrystallization resulting in a refined micrograin structure in the deformed regions to a substantially uniform minimum depth of about 20 microns; and (b) heating the cold-worked inner surfaces of said tubes, for an effective amount of time, at a temperature between its recrystallization temperature and its melting temperature, in an atmosphere of which the oxygen partial pressure is at least oxidizing with respect to chromium.

    摘要翻译: 通过(a)对所述管的内表面进行冷加工,以使表面变形到下述步骤(b)的后续热处理的程度,防止铸造奥氏体不锈钢管开始渗碳, 在变形区域中的M23C6碳化物伴随着重结晶,导致在变形区域中的精细微晶格结构基本上均匀的最小深度为约20微米; 和(b)在氧分压相对于氧分压的气氛中,在其再结晶温度与其熔融温度之间的温度下,将所述管的冷加工内表面加热有效的时间 铬。

    Carburization resistance of austenitic stainless steel tubes
    2.
    发明授权
    Carburization resistance of austenitic stainless steel tubes 失效
    奥氏体不锈钢管的耐渗碳性

    公开(公告)号:US4379745A

    公开(公告)日:1983-04-12

    申请号:US208986

    申请日:1980-11-21

    摘要: Protection of cast austenitic stainless steel tubes is provided against initiation of carburization by (a) cold-working the inner surfaces of said tubes to deform the surface to such a degree that upon the subsequent heat treatment of step (b) below, dissolution of the M.sub.23 C.sub.6 carbides in the deformed region is accompanied by recrystallization resulting in a refined micrograin structure in the deformed regions to a substantially uniform minimum depth of about 20 microns; and (b) heating the cold-worked inner surfaces of said tubes, for an effective amount of time, at a temperature between its recrystallization temperature and its melting temperature, in an atmosphere of which the oxygen partial pressure is at least oxidizing with respect to chromium.

    摘要翻译: 通过(a)对所述管的内表面进行冷加工,以使表面变形到下述步骤(b)的后续热处理的程度,防止铸造奥氏体不锈钢管开始渗碳, 在变形区域中的M23C6碳化物伴随着重结晶,导致在变形区域中的精细微晶格结构基本上均匀的最小深度为约20微米; 和(b)在氧分压相对于氧分压的气氛中,在其再结晶温度与其熔融温度之间的温度下,将所述管的冷加工内表面加热有效的时间 铬。

    Thermal barrier coating for nickel and cobalt base super alloys
    4.
    发明授权
    Thermal barrier coating for nickel and cobalt base super alloys 失效
    镍和钴基超级合金的隔热涂层

    公开(公告)号:US4248940A

    公开(公告)日:1981-02-03

    申请号:US811807

    申请日:1977-06-30

    摘要: Adherent, thermal shock-resistant protective coatings for nickel base super alloys are obtained by applying to the base metal a thin bond coat of an alloy of chromium aluminum and yttrium with materials selected from the group consisting of iron, cobalt, nickel and nickel-cobalt and applying thereover a continuously graded mixture of this material with a zirconia-based ceramic, the concentration of zirconia-based ceramic increasing from the bond coat to the outer layer. The zirconia ceramic may be stabilized by the addition thereto of amounts of magnesium oxide or other materials.

    摘要翻译: 通过向基体金属施加铬铝和钇合金的薄粘合层与选自铁,钴,镍和镍钴的材料,获得用于镍基超级合金的附着的耐热冲击保护涂层 并在其上施加该材料的连续分级混合物与氧化锆基陶瓷,氧化锆基陶瓷的浓度从粘合涂层增加到外层。 氧化锆陶瓷可以通过添加氧化镁或其它材料的量来稳定。

    Diffusion of elements into steel by catalyzed oxide reduction
    7.
    发明授权
    Diffusion of elements into steel by catalyzed oxide reduction 失效
    通过催化氧化还原将元素扩散到钢中

    公开(公告)号:US4904500A

    公开(公告)日:1990-02-27

    申请号:US255895

    申请日:1988-10-11

    IPC分类号: C23C10/46

    CPC分类号: C23C10/46

    摘要: A process for diffusing silicon into iron or iron alloy by heating the iron or iron alloy with silica and a suitable reducing agent in the presence of a catalyst.

    摘要翻译: 通过在催化剂存在下,用二氧化硅和合适的还原剂加热铁或铁合金将硅扩散到铁或铁合金中的方法。