【摘要】：對WC-Co/40Cr進(jìn)行電子束焊接試驗(yàn),研究了焊縫和界面組織,同時分析了焊縫中裂紋的產(chǎn)生機(jī)理.結(jié)果表明,焊縫主要由馬氏體和脆性η相組成,在組織和拉應(yīng)力作用下生成兩種典型裂紋缺陷,一類為冷卻過程中尚未凝固的液態(tài)薄膜不能填充間隙產(chǎn)生的結(jié)晶裂紋;一類為較大殘余拉應(yīng)力使得焊縫中硬脆相開裂形成的淬硬脆化裂紋.界面由于元素?cái)U(kuò)散作用產(chǎn)生貧碳環(huán)境,在合適的溫度梯度下會有η相包絡(luò)生成.測試接頭的力學(xué)性能,發(fā)現(xiàn)接頭平均抗剪強(qiáng)度為506 MPa,斷裂貫穿于硬質(zhì)合金熱影響區(qū)、界面、焊縫處,分別呈現(xiàn)沿晶斷裂、準(zhǔn)解理斷裂和解理斷裂的特征.
[Abstract]:Electron beam welding (EBW) of WC-Co/40Cr was carried out to study the weld and interfacial microstructure, and the mechanism of crack formation in the weld was analyzed. The results show that the weld is mainly composed of martensite and brittle_phase. Under the action of microstructure and tensile stress, two kinds of typical crack defects were formed. One is that the liquid film which has not been solidified during cooling can not be filled. Crystalline cracks formed by filling gaps; hardening embrittlement cracks formed by cracking of hard and brittle phases due to large residual tensile stress in weld seams. Carbon-poor environment is produced at the interface due to element diffusion, and_phase envelope is formed at suitable temperature gradient. Intergranular fracture, quasi-cleavage fracture and cleavage fracture occur at the HAZ, interface and weld of cemented carbide.
【作者單位】： 哈爾濱工業(yè)大學(xué)先進(jìn)焊接與連接國家重點(diǎn)試驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51375115)
【分類號】：TG456.3

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