KR20190028319A - 코발트기 합금 적층 조형체, 코발트기 합금 제조물, 및 그것들의 제조 방법 - Google Patents
코발트기 합금 적층 조형체, 코발트기 합금 제조물, 및 그것들의 제조 방법 Download PDFInfo
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- KR20190028319A KR20190028319A KR1020180105819A KR20180105819A KR20190028319A KR 20190028319 A KR20190028319 A KR 20190028319A KR 1020180105819 A KR1020180105819 A KR 1020180105819A KR 20180105819 A KR20180105819 A KR 20180105819A KR 20190028319 A KR20190028319 A KR 20190028319A
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- cobalt
- based alloy
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- Automation & Control Theory (AREA)
- Powder Metallurgy (AREA)
Abstract
본 발명에 따른 Co기 합금 제조물은, 0.08∼0.25질량%의 C와, 0.1질량% 이하의 B와, 10∼30질량%의 Cr과, Fe가 5질량% 이하이고 합계가 30질량% 이하인 Fe 및 Ni와, 합계가 5∼12질량%인 W 및/또는 Mo와, 합계가 0.5∼2질량%인 Ti, Zr, Nb 및 Ta과, 0.5질량% 이하의 Si과, 0.5질량% 이하의 Mn과, 0.003∼0.04질량%의 N를 포함하고, 잔부가 Co과 불순물을 포함하는 화학 조성을 갖고, 상기 제조물은, 평균 결정입경이 20㎛ 이상 145㎛ 이하인 다결정체이며, 상기 다결정체의 결정립 내에는, 상기 Ti, 상기 Zr, 상기 Nb 및/또는 상기 Ta을 포함하는 MC형 탄화물상 입자가 0.15㎛ 이상 1.5㎛ 이하의 평균 입자간 거리로 석출되어 있는 것을 특징으로 한다.
Description
도 2는 본 발명에 따른 Co기 합금 AM체의 미세 조직의 일례를 나타내는 주사형 전자 현미경(SEM) 관찰상이다.
도 3은 본 발명에 따른 Co기 합금 제조물의 일례이며, 터빈 고온 부재로서의 터빈 정익을 도시하는 사시 모식도이다.
도 4는 본 발명에 따른 Co기 합금 제조물을 장비하는 가스 터빈의 일례를 도시하는 단면 모식도이다.
도 5는 레이저 금속 퇴적법(LMD법)에 의해 형성한 Co기 합금 AM체의 미세 조직의 일례를 나타내는 SEM 관찰상이다.
도 6은 정밀 주조법에 의해 형성한 Co기 합금 주조체의 미세 조직의 일례를 나타내는 SEM 관찰상이다.
도 7은 Co기 합금 AM체에 있어서의 편석 셀의 평균 사이즈와 Co기 합금 제조물에 있어서의 0.2% 내력의 관계예를 나타내는 그래프이다.
도 8은 본 발명에 따른 Co기 합금 AM체를 얻기 위한 SLM 조건예이며, 합금 분말상의 두께와 국소 입열량의 관계를 나타내는 그래프이다.
Claims (14)
- 코발트기 합금을 포함하는 적층 조형체이며,
상기 코발트기 합금은,
0.08질량% 이상 0.25질량% 이하의 탄소와,
0.1질량% 이하의 붕소와,
10질량% 이상 30질량% 이하의 크롬과,
철이 5질량% 이하이고 합계가 30질량% 이하인 철 및 니켈과,
합계가 5질량% 이상 12질량% 이하인 텅스텐 및/또는 몰리브덴과,
합계가 0.5질량% 이상 2질량% 이하인 티타늄, 지르코늄, 니오븀 및 탄탈륨과,
0.5질량% 이하의 규소와,
0.5질량% 이하의 망간과,
0.003질량% 이상 0.04질량% 이하의 질소를 포함하고,
잔부가 코발트와 불순물을 포함하는 화학 조성을 갖고, 상기 적층 조형체는, 평균 결정입경이 10㎛ 이상 100㎛ 이하인 다결정체이며,
상기 다결정체의 결정립 내에는, 상기 티타늄, 상기 지르코늄, 상기 니오븀 및/또는 상기 탄탈륨을 포함하는 MC형 탄화물상을 형성하는 성분이 경계 영역에 편석되어 있고 평균 사이즈가 0.15㎛ 이상 1.5㎛ 이하인 편석 셀이 형성되어 있는, 및/또는 상기 MC형 탄화물상의 입자가 0.15㎛ 이상 1.5㎛ 이하의 평균 입자간 거리로 석출되어 있는,
것을 특징으로 하는 코발트기 합금 적층 조형체. - 제1항에 있어서,
상기 코발트기 합금의 상기 화학 조성은,
상기 티타늄이 0.01질량% 이상 1질량% 이하이고,
상기 지르코늄이 0.05질량% 이상 1.5질량% 이하이고,
상기 니오븀이 0.02질량% 이상 1질량% 이하이고,
상기 탄탈륨이 0.05질량% 이상 1.5질량% 이하인,
것을 특징으로 하는 코발트기 합금 적층 조형체. - 제1항 또는 제2항에 있어서,
상기 코발트기 합금의 상기 화학 조성은, 상기 불순물로서,
0.5질량% 이하의 알루미늄과,
0.04질량% 이하의 산소를 포함하는,
것을 특징으로 하는 코발트기 합금 적층 조형체. - 코발트기 합금을 포함하는 제조물이며,
상기 코발트기 합금은,
0.08질량% 이상 0.25질량% 이하의 탄소와,
0.1질량% 이하의 붕소와,
10질량% 이상 30질량% 이하의 크롬과,
철이 5질량% 이하이고 합계가 30질량% 이하인 철 및 니켈과,
합계가 5질량% 이상 12질량% 이하인 텅스텐 및/또는 몰리브덴과,
합계가 0.5질량% 이상 2질량% 이하인 티타늄, 지르코늄, 니오븀 및 탄탈륨과,
0.5질량% 이하의 규소와,
0.5질량% 이하의 망간과,
0.003질량% 이상 0.03질량% 이하의 질소를 포함하고,
잔부가 코발트와 불순물을 포함하는 화학 조성을 갖고,
상기 제조물은, 평균 결정입경이 20㎛ 이상 145㎛ 이하인 다결정체이며,
상기 다결정체의 결정립 내에는, 상기 티타늄, 상기 지르코늄, 상기 니오븀 및/또는 상기 탄탈륨을 포함하는 MC형 탄화물상의 입자가 0.15㎛ 이상 1.5㎛ 이하의 평균 입자간 거리로 석출되어 있는,
것을 특징으로 하는 코발트기 합금 제조물. - 제4항에 있어서,
상기 제조물은, 실온 0.2% 내력이 500MPa 이상이며, 58MPa의 응력으로 10만시간 파단되지 않는 크리프 내용 온도가 875℃ 이상인 것을 특징으로 하는 코발트기 합금 제조물. - 제4항 또는 제5항에 있어서,
상기 코발트기 합금의 상기 화학 조성은,
상기 티타늄이 0.01질량% 이상 1질량% 이하이고,
상기 지르코늄이 0.05질량% 이상 1.5질량% 이하이고,
상기 니오븀이 0.02질량% 이상 1질량% 이하이고,
상기 탄탈륨이 0.05질량% 이상 1.5질량% 이하인,
것을 특징으로 하는 코발트기 합금 제조물. - 제4항 또는 제5항에 있어서,
상기 코발트기 합금의 상기 화학 조성은, 상기 불순물로서,
0.5질량% 이하의 알루미늄과,
0.04질량% 이하의 산소를 포함하는,
것을 특징으로 하는 코발트기 합금 제조물. - 제4항 또는 제5항에 있어서,
상기 제조물은, 터빈 고온 부재인 것을 특징으로 하는 코발트기 합금 제조물. - 제8항에 있어서,
상기 터빈 고온 부재는, 터빈 정익 또는 연소기 노즐인 것을 특징으로 하는 코발트기 합금 제조물. - 제1항 또는 제2항에 기재된 코발트기 합금 적층 조형체의 제조 방법이며,
상기 화학 조성을 갖는 코발트기 합금 분말을 준비하는 합금 분말 준비 공정과,
상기 코발트기 합금 분말을 깔아서 소정 두께의 합금 분말상을 준비하는 합금 분말상 준비 소공정과, 상기 합금 분말상의 소정의 영역에 레이저광을 조사하여 그 영역의 상기 코발트기 합금 분말을 국소 용융·급랭 응고시키는 레이저 용융 응고 소공정을 반복하여 적층 조형체를 형성하는 선택적 레이저 용융 공정을 갖고,
상기 선택적 레이저 용융 공정에 있어서, 상기 합금 분말상의 상기 소정 두께 h(단위: ㎛)와 상기 레이저광의 출력 P(단위: W)와 상기 레이저광의 주사 속도 S(단위:mm/s)의 관계가 「15<h<150」 또한 「67(P/S)-3.5<h<2222(P/S)+13」을 만족시키도록, 상기 소정 두께 h와 상기 출력 P와 상기 주사 속도 S를 제어하는,
것을 특징으로 하는 코발트기 합금 적층 조형체의 제조 방법. - 제10항에 있어서,
상기 합금 분말 준비 공정은, 상기 코발트기 합금 분말을 5㎛ 이상 100㎛ 이하의 입경 범위로 분급하는 합금 분말 분급 소공정을 포함하는 것을 특징으로 하는 코발트기 합금 적층 조형체의 제조 방법. - 제4항 또는 제5항에 기재된 코발트기 합금 제조물의 제조 방법이며,
상기 화학 조성을 갖는 코발트기 합금 분말을 준비하는 합금 분말 준비 공정과,
상기 코발트기 합금 분말을 깔아서 소정 두께의 합금 분말상을 준비하는 합금 분말상 준비 소공정과, 상기 합금 분말상의 소정의 영역에 레이저광을 조사하여 그 영역의 상기 코발트기 합금 분말을 국소 용융 급랭 응고시키는 레이저 용융 응고 소공정을 반복하여 적층 조형체를 형성하는 선택적 레이저 용융 공정과,
상기 적층 조형체에 대하여 1100℃ 이상 1200℃ 이하의 온도 범위에서 0.5시간 이상 10시간 이하의 유지 시간의 용체화 처리를 실시하는 용체화 열처리 공정을 갖고,
상기 선택적 레이저 용융 공정에 있어서, 상기 합금 분말상의 상기 소정 두께 h(단위: ㎛)와 상기 레이저광의 출력 P(단위: W)와 상기 레이저광의 주사 속도 S(단위:mm/s)의 관계가 「15<h<150」 또한 「67(P/S)-3.5<h<2222(P/S)+13」을 만족시키도록, 상기 소정 두께 h와 상기 출력 P와 상기 주사 속도 S를 제어하는,
것을 특징으로 하는 코발트기 합금 제조물의 제조 방법. - 제12항에 있어서,
상기 합금 분말 준비 공정은, 상기 코발트기 합금 분말을 5㎛ 이상 100㎛ 이하의 입경 범위로 분급하는 합금 분말 분급 소공정을 포함하는 것을 특징으로 하는 코발트기 합금 제조물의 제조 방법. - 제12항에 있어서,
상기 용체화 열처리 공정 후에, 상기 적층 조형체에 대하여 750℃ 이상 1000℃ 이하의 온도 범위에서 0.5시간 이상 10시간 이하의 유지 시간의 시효 처리를 실시하는 시효 열처리 공정을 더 갖는 것을 특징으로 하는 코발트기 합금 제조물의 제조 방법.
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CN112813308B (zh) | 2022-05-31 |
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JP2019049022A (ja) | 2019-03-28 |
KR102132656B1 (ko) | 2020-07-13 |
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US20200016659A1 (en) | 2020-01-16 |
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