Nano-scale chemical inhomogeneity in surface oxide films formed on a V-and N-containing martensite stainless steel and tempering heating induced changes are investigated by a combination of synchrotron-based hard X-ra...Nano-scale chemical inhomogeneity in surface oxide films formed on a V-and N-containing martensite stainless steel and tempering heating induced changes are investigated by a combination of synchrotron-based hard X-ray Photoelectron emission spectroscopy(HAXPES)and microscopy(HAXPEEM)as well as microscopic X-ray absorption spectroscopy(μ-XAS)techniques.The results reveal the inhomogeneity in the oxide films on the micron-sized Cr_(2)N-and VN-type particles,while the inhomogeneity on the martensite matrix phase exists due to localised formation of nano-sized tempering nitride particles at 600℃.The oxide film formed on Cr_(2)N-type particles is rich in Cr_(2)O_(3) compared with that on the martensite matrix and VN-type particles.With the increase of tempering temperature,Cr_(2)O_(3) formation is faster for the oxidation of Cr in the martensite matrix than the oxidation of Cr nitride-rich particles.展开更多
采用自约束热疲劳试验方法 ,在相同的热处理条件下 ,对比研究了 840 7、4Cr5 Mo Si V1钢的纵横向热疲劳特性 ,观察分析了两种钢的热疲劳裂纹形貌及深度 ,并选择典型试样进行扫描电镜分析 .结果表明 ,840 7钢比4Cr5 Mo Si V1钢的碳化物...采用自约束热疲劳试验方法 ,在相同的热处理条件下 ,对比研究了 840 7、4Cr5 Mo Si V1钢的纵横向热疲劳特性 ,观察分析了两种钢的热疲劳裂纹形貌及深度 ,并选择典型试样进行扫描电镜分析 .结果表明 ,840 7钢比4Cr5 Mo Si V1钢的碳化物颗粒较小 ,而且分布均匀 ,从而表现出较好的热疲劳性能 ;尤其是 4Cr5 Mo Si V1钢的横纵向热疲劳性能差异较 840 7钢大 ,即 840 7钢的各向同性要优于 4Cr5 Mo Si V1钢 ,与两种钢的横纵向冲击韧性的比值相对应 .展开更多
基金supported by the Vinnova(project number 2020-03778)supported by the Swedish Research Council(Vetenskapsradet,project number 2021-04157).
文摘Nano-scale chemical inhomogeneity in surface oxide films formed on a V-and N-containing martensite stainless steel and tempering heating induced changes are investigated by a combination of synchrotron-based hard X-ray Photoelectron emission spectroscopy(HAXPES)and microscopy(HAXPEEM)as well as microscopic X-ray absorption spectroscopy(μ-XAS)techniques.The results reveal the inhomogeneity in the oxide films on the micron-sized Cr_(2)N-and VN-type particles,while the inhomogeneity on the martensite matrix phase exists due to localised formation of nano-sized tempering nitride particles at 600℃.The oxide film formed on Cr_(2)N-type particles is rich in Cr_(2)O_(3) compared with that on the martensite matrix and VN-type particles.With the increase of tempering temperature,Cr_(2)O_(3) formation is faster for the oxidation of Cr in the martensite matrix than the oxidation of Cr nitride-rich particles.
文摘采用自约束热疲劳试验方法 ,在相同的热处理条件下 ,对比研究了 840 7、4Cr5 Mo Si V1钢的纵横向热疲劳特性 ,观察分析了两种钢的热疲劳裂纹形貌及深度 ,并选择典型试样进行扫描电镜分析 .结果表明 ,840 7钢比4Cr5 Mo Si V1钢的碳化物颗粒较小 ,而且分布均匀 ,从而表现出较好的热疲劳性能 ;尤其是 4Cr5 Mo Si V1钢的横纵向热疲劳性能差异较 840 7钢大 ,即 840 7钢的各向同性要优于 4Cr5 Mo Si V1钢 ,与两种钢的横纵向冲击韧性的比值相对应 .
