CrWMn钢喷涂NiFeCrBSi（G112）合金粉层的超塑焊合

SUPERPLASTIC WELDING OF FLAME SPRAYED NiFeCrBSi ALLOY COATING ON CrWMn STEEL

ＣｒＷＭｎ钢火焰喷涂ＮｉＦｅＣｒＢＳｉ合金涂层，进行了恒温压缩超塑性试验，采用变截面法测定了ＣｒＷＭｎ钢的塑性流动应力对变形速率敏感性指数ｍ值．用涂层和基材的应变速率比Ｗ值，确定涂层和基材的最佳超塑条件．研究了涂层孔洞、涂层原颗粒间界及涂层与基材结合界面在不同变形温度下的焊合效果，指出在基材超塑温度范围内，Ｗ＝１时，涂层焊合良好，并具有较高的多冲抗力．

The compressive superplastic tests at constant temperature were carried out on flame sprayed NiFeCrBSi(G112)alloy coating on CrWMn steel.A section conversion method has been used to measure the values m at different temperatures. The optimum superplastic condition was determined by optimizing the strain rate ratio of flame sprayed coating and substrate under defomation.The welding effects of the porosities inside the deformed coating and the bonding interfaces between the coating and substrate at different deformation temperatures have been analysed. The influence of deformation conditions on the multiple impact failure behaviors of the superplastically deformed coatings have also been investigated. The results show that the porosities inside the coating and the bonding interface between the coating and the substrate can be effectively welded at the superplastic temperature range of the substrate steel CrWMn if the value W of strain rate ratio between the coating and the substrate are approximate to one and as a result a good multiple impact behaviour can be obtained.