以BNi-2非晶为中间层的CB2耐热钢瞬时液相扩散连接的接头组织和性能研究（英文）  

Microstructure and Mechanical Properties of Transient Liquid Phase Bonded Joints of CB2 Ferritic Heat Resistant Steels with Amorphous BNi-2 Interlayer

作　　者：何洪杰 盛光敏[1] 刘铭灿 焦英俊 He Hongjie;Sheng Guangmin;Liu Mingcan;Jiao Yingjun(Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学,重庆400044

出　　处：《稀有金属材料与工程》2018年第8期2290-2297,共8页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51205428)

摘　　要：主要研究采用BNi-2非晶态中间层的CB2耐热钢瞬时液相(TLP)扩散连接接头组织和性能,及焊后热处理(PBHT)对接头组织和性能的影响。富Cr硼化物和Cr-Mo硼化物出现在接头的过渡区和扩散影响区,其尺寸和数量在等温凝固完成时达到最大值。随着连接温度和时间的增加,富Cr的硼化物和Cr-Mo硼化物逐渐减少,而BN相逐渐增多。经过焊后热处理后,接头的富Cr硼化物几乎全部消失,而BN相的尺寸和数量增加。在热处理之前,焊接温度为1150℃,保温时间1800 s的接头有最大抗拉伸强度,为934 MPa,延伸率为5.3%。通过焊后热处理,断裂发生在母材,而其延伸率显著提高到20%,而抗拉伸强度降低到720 MPa,其性能与原始的母材性能相近。Microstructure and mechanical properties of transient liquid phase （TLP） bonded joints and the post bonding heat treatment （PBHT） for CB2 heat resistant steel using BNi-2 insert alloy were investigated. The Cr-rich borides and Cr-Mo borides generated in the transition region （TZ） and diffusion-affected zone （DAZ） reach the peak values in size and quantity when the isothermal solidification is completed. Subsequent elevation in bonding temperature and increment in bonding time result in gradual disappearance of such Cr-rich and Cr-Mo borides, as well as increased percent of BN precipitates. After PBHT the Cr-rich borides almost disappear while the size and amount of BN precipitates rise. The maximum tensile strength reaches to 934 MPa for the joint bonded at 1150 ~C for 1800 s with elongation of only 5.3%. PBHT result in significant improvement in ductility of the joint as elongation of 20% is achieved with a decreased strength of 720 MPa, while the fracture takes place at base materials.

关 键 词：CB2耐热钢 瞬时液相焊接 焊后热处理 富Cr硼化物 BN相 

分 类 号：TG453.9[金属学及工艺—焊接]