热处理对1Cr18Ni9Ti与2Cr13钢焊接接头断口组织形貌的影响
The effect of heat treatment on 1Cr18Ni9Ti and 2Cr13 steel welding joints Fracture Microstructure and pattern
赵勇桃
点击：2340次 下载：0次
作者单位：内蒙古科技大学材料与冶金学院
中文关键字：1Cr18Ni9Ti；2Cr13；焊后热处理；断口形貌
英文关键字：1Cr18Ni9Ti；2Cr13；Post-weld heat treatment; Fracture appearance
中文摘要：通过钨极氩弧焊方法，在一定工艺条件下对1Cr18Ni9Ti与2Cr13实施焊接，后对焊接接头进行焊后热处理。通过万能拉伸机对热处理前后的焊接接头进行拉伸试验，采用OM、SEM对1Cr18Ni9Ti与2Cr13钢热处理前后的焊接接头进行断口组织形貌观察及分析。结果表明，1Cr18Ni9Ti和2Cr13焊接接头热处理前焊缝组织为典型的柱状晶，组织为板条马氏体+残余奥氏体+碳化物；热处理后焊缝组织转变为回火索氏体。拉伸时，热处理前后焊接接头断裂部位都发生在奥氏体不锈钢热影响区一侧，均属于韧性断裂，热处理前韧窝大小、分布不均匀；热处理后韧窝变小，分布均匀，大小尺寸均等。热处理前，焊接接头的抗拉强度约为635MPa，延伸率约为26%，断面收缩率约为44%；热处理后，焊接接头的抗拉强度约为645MPa，延伸率约为24%，断面收缩率约为44%。
英文摘要：By method of TIG, under certain welding craft conditions，1Cr18Ni9Ti and 2Cr13 were welded, and certain heat treatment was carried on to welding joint. by electronic universal tensile machine，tensile experiments were gone on，By OM、SEM，the fracture pattern of 2Cr13 and 1Cr18Ni9Ti welding joints were observed and analyzed before and after heat treatment. The results show that before heat treatment, 2Cr13 and 1Cr18Ni9Ti welded joints is columnar crystal, the microstructure is lath martensite + austenite + carbide，After heat treatment，the structure is changed from lath martensite into tempered sorbite. After tensile，the fracture position of welding joints is HAZ of austenitic stainless steel，belong to toughness fracture，Before heat treatment the dimple size and distribute aren’t uniform; after heat treatment, they are uniform. Before heat treatment, the tensile strength of welding joints is about 635MPa, elongation is 26%, reduction of area is 44%; after heat treatment，the tensile strength of welding joints is about 645MPa, elongation is 24%, reduction of area is 44%.