Kai LIU
材料科学技术（英文）
The 18%Ni alloy steels provide high strength and toughness, while age-hardenable or PH stainless steels also have good corrosion resistance. This paper focuses on an investigation of the heat treatment, mechanical properties and microstructural development of a new maraging stainless steel. It is reported that the heat treatment process should consist of solution treatment and cryogenic cooling to attain a fully martensitic structure, followed by aging at 813 K. This heat treatment resulted in an ultimate tensile strength of over 1900 MPa combined with good impact toughness. Transmission electron microscopy is used to show that, for the peak-aged condition (813 K/4 h), nano-sized precipitates, e.g. Ni3Mo and/or R-phase, and a high density of dislocations were uniformly dispersed in the lath martensite matrix. The calculated yield strength, based on a revised Orowan mechanism, is in good agreement with the test data. The steel studied has an ultimate tensile strength over 1900 MPa, excellent fracture toughness, and good resistance against over-aging and relatively good corrosion resistance as well.
关键词:
Maraging stainless steels
,
steels
,
Precipitation
,
High
,
stren
康士朋
,
唐杰
,
宋林郁
,
王业伟
,
李新宽
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2016.03.015
为了满足重型卫星发射要求,需要研制具有高承载能力的条带.以φ937 mm接口包带装置为例,采用18Ni马氏体时效钢开展条带设计,条带制造过程中对热处理工艺、表面抛光工艺进行研究:条带的屈服强度达到1 723 MPa,使包带装置承载能力提高了一倍;条带表面粗糙度达到0.4,满足包带装置使用要求.通过静力试验及分离试验对产品进行了考核,结果表明18Ni马氏体时效钢条带满足设计要求.
关键词:
超高强度钢
,
18Ni
,
马氏体
,
条带
