本文選題：MPa級(jí)熔敷金屬　切入點(diǎn)：保護(hù)氣　出處：《金屬學(xué)報(bào)》2015年12期

【摘要】：研究了不同保護(hù)氣(Ar+5%CO2,Ar+10%CO2,Ar+20%CO2和Ar+30%CO2)對(duì)1000 MPa級(jí)高強(qiáng)熔敷金屬組織及強(qiáng)韌性的影響.結(jié)果表明,當(dāng)CO2含量為20%時(shí),熔敷金屬力學(xué)強(qiáng)韌性最佳,屈服強(qiáng)度為980 MPa,室溫沖擊功為72.6 J,-40℃沖擊功為52 J.組織觀察和分析結(jié)果表明,隨著保護(hù)氣中CO2含量增加,熔敷金屬組織中貝氏體板條含量增多,且貝氏體板條分布形態(tài)由平行狀向交織狀轉(zhuǎn)變,交織狀貝氏體板條分割細(xì)化原奧氏體晶粒,從而細(xì)化馬氏體板條.貝氏體含量和馬氏體/貝氏體板條的分布形態(tài)是決定熔敷金屬力學(xué)性能的根本原因.貝氏體含量并非越多越好,存在最佳含量比例;隨著保護(hù)氣CO2含量的進(jìn)一步增加,熔敷金屬夾雜物數(shù)量增加,尺寸增大,且主要成分含量發(fā)生變化.當(dāng)保護(hù)氣中CO2含量為30%時(shí),出現(xiàn)較大尺寸的夾雜物,導(dǎo)致熔敷金屬韌性降低.
[Abstract]:The effects of different protective gases on the microstructure and toughness of high strength deposited metal of 1000 MPa grade were studied. The results showed that when the content of CO2 was 20%, the mechanical strength and toughness of deposited metal was the best. The yield strength was 980 MPA and the impact energy at room temperature was 72.6 J / -40 鈩，

本文編號(hào)：1680629