论文部分内容阅读
采用药芯焊丝埋弧堆焊方法制备含有C0.5%～0.7%,Cr9%～12%,B0%～2.25%(质量分数)的堆焊合金。借助光学显微镜、扫描电镜、X射线衍射和微区EDS分析等手段研究其显微组织及分布形貌。结果表明,其显微组织由铁素体+奥氏体+马氏体+硼化物((Fe,Cr)2B,(Fe,Cr)23(C,B)6,(Fe,Cr)B和(Fe,Cr)3(B,C))等组成,硼化物呈条状、菊花状、块状甚至蜂窝状等形态,不同硼化物数量及其分布形态随硼含量而改变,其中最为典型是(Fe,Cr)23(C,B)6呈菊花状并聚集分布。另外,考察了硼含量对Fe-10Cr-xB-0.6C堆焊合金硬度及耐磨性的影响,耐磨粒磨损试验结果表明,高硼堆焊合金的磨损性优良,当聚集分布的硼化物数量过多,磨粒压入基体及其显微切削运动受到硼化物的有效阻碍,但部分硼化物脱落留下的空洞使其压入切削变易,这使得硼化物与基体的界面结合强度成为影响其耐磨性的一个重要甚至主导因素。
The surfacing welding with C0.5% ~ 0.7%, Cr9% ~ 12%, B0% ~ 2.25% (mass fraction) was prepared by submerged arc welding with flux cored wire. The microstructure and distribution morphology were studied by means of optical microscope, scanning electron microscopy, X-ray diffraction and EDS analysis. The results show that the microstructure is composed of ferrite + austenite + martensite + boride (Fe, Cr) 2B, (Fe, Cr) 23 (Fe, Cr) 3 (B, C)). The borides are in the shape of strips, chrysanthemums, massive or even honeycombs. The amount and distribution of different borides change with the content of boron, the most typical is (Fe, Cr) 23 (C, B) 6 is daisy-like and aggregated distribution. In addition, the effect of boron content on the hardness and wear resistance of the Fe-10Cr-xB-0.6C surfacing alloy was investigated. The results of the wear-resistant particles wear test showed that the wear resistance of the high boron surfacing alloy is excellent. When the aggregated distribution of boride Excessive amount of abrasive particles into the substrate and the micro-cutting movement by the effective obstruction of boride, but part of the boride left off the hole to make it easy to cut into the easy, which makes boride and substrate interface strength of an impact An important or even dominant factor in its wear resistance.