鈷基釬料釬焊K465合金大間隙接頭組織與性能

鈷基釬料釬焊K465合金大間隙接頭組織與性能Microstructure and Mechanical Properties of Wide-gap Brazed Joints of K465 Alloy Using Cobalt-base Brazing Alloy

采用Co45NiCrWB鈷基釬料，預(yù)填FGH95鎳基合金粉，在1220 ℃不同保溫時(shí)間下對(duì)K465高溫合金進(jìn)行0.5 mm大間隙真空釬焊實(shí)驗(yàn)，研究釬縫組織構(gòu)成及不同保溫時(shí)間對(duì)釬縫組織與接頭性能的影響。結(jié)果表明：釬縫組織由合金粉顆粒及顆粒間硼化物相構(gòu)成，顆粒內(nèi)為γ和γ'雙相組織和少量小塊狀硼化相，顆粒間是高Cr，W和Nb的硼化物相；釬焊時(shí)隨保溫時(shí)間延長(zhǎng)合金粉長(zhǎng)大，化合物相合并長(zhǎng)大；合金粉比例高、保溫時(shí)間適當(dāng)獲得釬縫中化合物相細(xì)小彌散分布，對(duì)接頭性能有利；釬焊保溫30~60 min時(shí)接頭持久性能較高。

Vacuum brazing of K465 superalloy was carried out by using Co45NiCrWB cobalt-base filler metal at 1220 ℃ for different holding time, and the joint clearance was 0.5 mm pre-filled with FGH95 nickel-base superalloy powder. The effect of the structural constitution of brazed different holding time of temperature on the brazed joint microstructure and properties. The results show that the brazing seam is composed of alloy powder particles and borides among them. It is two-phase structure of γ and γ' with a few small blocks of borides in the powder particles, and there exists phases rich in Cr, W and Nb elements. The powder particles are growing along the holding time during the brazing process, while their combination is expanded. It is good for stress rapture properties of joints that borides was fine in brazing seam with more superalloy powder and proper holding time. And the joints brazed for 30-60 min show higher stress rapture properties.

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