The Influence of Ceramic Coating on Fatigue Crack Growth Behaviour of X17CrNi15-2 Stainless Steel

• 作者: Dalong Wang Fei Xiao Hao Liu Huigang Wu Jian Ye Jiankai Zhang Jingbin Chen Mengyu Wu Na Gao Ran Li Rongming Chen Rui Zhao Shoubin Li Wei Wang Wenshu Wei Yao Xu
• 来源期刊: 工程(英文)(1947-3931)
• 学科: 工学
• 关键词: Fatigue CRACK Growth SEN B3 Precracked SPECIMEN X17CrNi15-2 CERAMIC Coating DEPOSITION Surface Treatment Corrosion Resistance
• 年，卷（期）: gc-eng,（2）
• 页码范围: 140-149
• 页数: 10页
• 分类号: TG1

摘要

Fatigue crack growth tests were carried out on the SEN B3 precracked specimens, with dimensions in accordance with ISO 12108 requirements. The specimens were made of martensitic stainless steel, X17CrNi15-2, and some of them were modified by the ceramic coating deposition surface treatment. The effects of ceramic coating, on the fatigue crack growth behaviour of hollow shaft specimens, were experimentally investigated. Fatigue crack growth rates, da/dN, were characterised, using the power law relationship between da/dN (in mm/cycle) and the stress intensity factor range, ΔK (in MPa∙m0.5). The two constants of the correlation are 7.9768 × 10−9 and 2.8107 for the parent material, and those for the coated material are 2.4391 × 10−9 and 3.1990, respectively. Microstructural analyses were carried out on the tested specimens, which shows that the maximum hardness of the ceramic coating is higher than that of substrate by a factor of ~3.2. The dimple fracture dominates the final fracture mechanism for the parent material, and the combination of fatigue, ductile fracture and cleavage dominates the final fracture mechanism for the coated material, based on the SEM analyses. EDS tests’ results reveal that the parent material specimen shows higher levels of C at matrix regions along with Fe- and O-rich regions, compared with the coated material specimen.