Fluid contact member and method of manufacturing fluid contact member
To provide a fluid contact member whose corrosion resistance is particularly further improved than that in the related art. In order to solve this problem, a fluid contact member 10 includes a fluid contact portion 1 configured to be in contact with a fluid, the fluid contact portion 1 has a cobalt-based alloy phase 2 having a dendrite, and a compound phase 3 formed in an arm space of the dendrite and containing chromium carbide, and among a plurality of secondary arms 5 extending from one primary arm 4 constituting the dendrite, an average interval between adjacent secondary arms 5 is 5 μm or less. At this time, the average interval is preferably 3 μm or less. Further, the compound phase 3 is preferably formed discontinuously in the dendrite arm space.
1. A fluid contact member, comprising:
a fluid contact portion configured to be in contact with a fluid; wherein
the fluid contact portion has a cobalt-based alloy phase having a dendrite, and
a compound phase formed in an arm space of the dendrite and containing chromium carbide, and
among a plurality of secondary arms extending from one primary arm constituting the dendrite, an average interval between adjacent secondary arms is 5 μm or less.
2. The fluid contact member according to claim 1 , wherein
the average interval is 3 μm or less.
3. The fluid contact member according to claim 1 , wherein
the compound phase is discontinuously formed in the dendrite arm space.
4. The fluid contact member according to claim 1 , wherein
the fluid contact portion contains:
0.9% by mass or more of carbon,
26% by mass or more and 32% by mass or less of chromium,
0% by mass or more and 6% by mass or less of tungsten,
0% by mass or more and 1% by mass or less of nickel,
0% by mass or more and 1% by mass or less of iron,
0% by mass or more and 1% by mass or less of molybdenum, and
cobalt and inevitable impurities as balance.
5. The fluid contact member according to claim 1 , wherein the fluid contact portion contains tungsten in a proportion of 3% by mass or more and 6% by mass or less.
6. The fluid contact member according to claim 1 , further comprising:
a fluid contact member for a nuclear facility.
7. The fluid contact member according to claim 1 , further comprising:
at least one of a valve disc and a valve seat.