6C和M23C6+ matrix = M6C。合金在高溫拉伸應(yīng)力下的斷裂機(jī)制為韌脆混合機(jī)制,塊狀初生碳化物與基體之間的界面容易成為裂紋萌生源。熱處理過(guò)程消除了容易引起晶界遷移的片層狀共晶M23C6,在骨架狀MC周圍析出了細(xì)小的M6C,同時(shí)改善了枝晶間元素偏析,促進(jìn)基體中形成高密度的交疊層錯(cuò)帶,使得合金在1000℃下的抗拉強(qiáng)度提高了約20MPa。"/>

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Co-Cr-Nb-W合金碳化物組織轉(zhuǎn)變及力學(xué)性能研究
作者:
作者單位:

1.鋼鐵研究總院 高溫材料研究所;2.北京鋼研高納科技股份有限公司;3.中國(guó)航發(fā)貴陽(yáng)發(fā)動(dòng)機(jī)設(shè)計(jì)研究所

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中圖分類號(hào):

基金項(xiàng)目:

國(guó)家重點(diǎn)研發(fā)計(jì)劃(項(xiàng)目號(hào)2022YFC3902002)


Carbides Evolution and Mechanical Behavior of Co-Cr-Nb-W Wear-resistance Alloy
Author:
Affiliation:

1.Central Iron and Steel Research Institute;2.Gaona Aero Material Co., Ltd.;3.AECC Guiyang Aero-Engine Research Institute

Fund Project:

National Key R&D Program of China

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    摘要:

    熱處理過(guò)程中的碳化物轉(zhuǎn)變對(duì)高溫合金的力學(xué)性能影響顯著。本實(shí)驗(yàn)采用XRD、SEM、EPMA、TEM等技術(shù)研究了Co-Cr-Nb-W耐磨合金熱處理過(guò)程中碳化物的析出類型、分布特征、演變機(jī)理及其對(duì)高溫拉伸性能的影響。Co-Cr-Nb-W耐磨合金主要在釬焊和時(shí)效熱處理后使用,該過(guò)程中主要發(fā)生如下兩個(gè)碳化物轉(zhuǎn)變過(guò)程：MC + matrix = M6C和M23C6+ matrix = M6C。合金在高溫拉伸應(yīng)力下的斷裂機(jī)制為韌脆混合機(jī)制,塊狀初生碳化物與基體之間的界面容易成為裂紋萌生源。熱處理過(guò)程消除了容易引起晶界遷移的片層狀共晶M23C6,在骨架狀MC周圍析出了細(xì)小的M6C,同時(shí)改善了枝晶間元素偏析,促進(jìn)基體中形成高密度的交疊層錯(cuò)帶,使得合金在1000℃下的抗拉強(qiáng)度提高了約20MPa。

    Abstract:

    Carbides transformation during heat-treatment process has a significant effect on the mechanical properties of superalloys. XRD, SEM, EPMA, and TEM were used to investigate the distribution and evolution mechanism of carbides and their effects on high-temperature tensile properties of Co-Cr-Nb-W wear-resistant alloy during heat-treatment process. There are two carbides transformation processes in the Co-Cr-Nb-W alloy during brazing simulation and aging: MC+matrix=M6C and M23C6+matrix=M6C. The fracture mechanism of the Co-Cr-Nb-W alloy under high temperature tensile stress is a hybrid mechanism of ductile fracture and brittle fracture, and the interface between the bulk primary carbide and the matrix is easy to become the source of crack source. The heat treatment process eliminates the lamellar M23C6 which is easy to cause grain boundary migration, induces the precipitation of fine M6C particles around the skeleton MC, improves the interdendritic element segregation, promotes the formation of high-density overlapping stacking fault (SF) bands in the matrix, and increases the tensile strength of the alloy at 1000℃ by about 20 MPa.

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凌晨,李尚平,林筠,侯杰,李義平,駱合力. Co-Cr-Nb-W合金碳化物組織轉(zhuǎn)變及力學(xué)性能研究[J].稀有金屬材料與工程,2024,53(3):815~824.[LingChen, Li Shangping, Lin Jun, Hou Jie, Li Yiping, Luo Heli. Carbides Evolution and Mechanical Behavior of Co-Cr-Nb-W Wear-resistance Alloy[J]. Rare Metal Materials and Engineering,2024,53(3):815~824.]
DOI：10.12442/j. issn.1002-185X.20230133

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  • 收稿日期:2023-03-15
  • 最后修改日期:2023-04-22
  • 錄用日期:2023-04-23
  • 在線發(fā)布日期: 2024-03-27
  • 出版日期: 2024-03-20