JP6960329B2 - 耐食耐摩耗盛金の形成方法および耐食耐摩耗弁の製造方法 - Google Patents
耐食耐摩耗盛金の形成方法および耐食耐摩耗弁の製造方法 Download PDFInfo
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- 239000002184 metal Substances 0.000 title claims description 73
- 238000005260 corrosion Methods 0.000 title claims description 64
- 230000007797 corrosion Effects 0.000 title claims description 64
- 238000000034 method Methods 0.000 title claims description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 51
- 239000000956 alloy Substances 0.000 claims description 51
- 239000013078 crystal Substances 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 4
- 239000010962 carbon steel Substances 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010953 base metal Substances 0.000 claims description 2
- 238000010891 electric arc Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 210000001787 dendrite Anatomy 0.000 description 30
- 239000000463 material Substances 0.000 description 23
- 239000008710 crystal-8 Substances 0.000 description 20
- 230000005496 eutectics Effects 0.000 description 18
- 238000005299 abrasion Methods 0.000 description 9
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000000654 additive Substances 0.000 description 7
- 230000000996 additive effect Effects 0.000 description 7
- 238000001000 micrograph Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000010828 elution Methods 0.000 description 5
- 229910001347 Stellite Inorganic materials 0.000 description 4
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004299 exfoliation Methods 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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Description
図1は、レーザ積層造形法による金属層形成の原理を模式的に示した図である。レーザ積層造形法は、いわゆる3Dプリンタで用いられている造形法の1つであるが、本実施形態は、そのレーザ積層造形法を盛金の形成に応用したものである。図1に示すように、レーザ積層造形法では、炭素鋼やステンレス鋼などからなる母材2の表面に、ノズル3から排出される金属の粉体5をレーザ光4で溶融して堆積することにより、金属層1を形成する。本実施形態では、粉体5の材料としては、例えばステライト(登録商標)などのCo基合金が用いられる。したがって、本実施形態で形成される金属層1は、Co基合金の層となる。
ところで、デンドライト9の結晶構造を有するCo基合金の表面が腐食していくメカニズムに、デンドライト9の結晶同士の境界部に析出する炭化物共晶体8が関わっていることが知られている。さらに、デンドライト9と炭化物共晶体8との境界部でCr濃度が減少するという現象が、炭化物共晶体8がデンドライト9から剥がれ易くなる原因であることが知られている。
図4は、本発明の第2の実施形態に係る仕切弁10の概略構造の例を示した図であり、図5は、図4の仕切弁10において弁座が含まれる部分を拡大して示した図である。仕切弁10は、流体が通流する配管部18の途中に設けられ、開状態にすることにより当該流体の通流を許容し、閉状態にすることにより当該流体の通流を停止させる。
2 母材
3 ノズル
4 レーザ光
5 粉体
7 耐食耐摩耗盛金
8 炭化物共晶体
9 デンドライト
10 仕切弁(耐食耐摩耗弁)
11 弁箱
12 弁体
13 弁箱側弁座
14 弁体側弁座
15 弁箱側弁座盛金
16 弁体側弁座盛金
17 弁棒
18 配管部
Claims (5)
- Co基合金の粉体を加熱、溶融して、前記Co基合金からなる層を形成する第1の工程と、
前記第1の工程を繰り返すことにより、前記Co基合金からなる層の表面上に前記Co基合金からなる別の層を複数層形成する第2の工程と、
を備え、
前記第1の工程および前記第2の工程において、前記Co基合金からなる層が形成されるたびに、前記Co基合金の粉体を加熱、溶融するための入熱量が低減され、
前記Co基合金からなる層を形成する場合には、予め堆積された前記Co基合金の粉体を加熱、溶融すること
を特徴とする耐食耐摩耗盛金の形成方法。 - 前記第1の工程および前記第2の工程において、少なくとも最表面に形成された前記層での、前記Co基合金のデンドライト構造の結晶同士の粒界に析出する炭化物共晶体のうち、最大の前記炭化物共晶体の大きさを10μm以下にするように、前記Co基合金からなる前記層を形成すること
を特徴とする請求項1に記載の耐食耐摩耗盛金の形成方法。 - 前記層の形成は、レーザ光、アーク放電、又は真空中における荷電粒子ビームを用いて行われること
を特徴とする請求項1又は2に記載の耐食耐摩耗盛金の形成方法。 - 前記層は、炭素鋼またはステンレス鋼の何れかである母材の表面に形成されること
を特徴とする請求項1又は2に記載の耐食耐摩耗盛金の形成方法。 - 流体を通流させる配管部と、前記配管部を開放または閉塞する弁体と、前記配管部の閉塞時に前記弁体と前記配管部とが互いに接する双方の部位に設けられる弁座と、を備えてなる耐食耐摩耗弁の製造方法であって、
前記弁座が請求項1又は2に記載の耐食耐摩耗盛金の形成方法により形成されることを特徴とする耐食耐摩耗弁の製造方法。
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