Temperature impact on delayed fracture of creep-resistant steels welds
Journal Title: Journal of Achievements in Materials and Manufacturing Engineering - Year 2018, Vol 1, Issue 88
Abstract
Purpose: Phenomenon of delayed fracture (or cold cracks formation) of hardenable steels weldments had been widely investigated. But temperature dependence of cracking susceptibility remained discussable, because there was no strict vision of temperature border for the cracking risk appearance, when joints are cooling after welding completion. The proposed paper aimed at assessment of dangerous temperature range at which delayed fracture, mainly for the steels with martensite formation, becomes most probable. Design/methodology/approach: The “Implant” test, conducted under isothermal conditions at the temperatures selected within the range from 160 to 20°C on cooling of the completed test weld joint, was used. Basing on the obtained thermokinetic characteristics of the cracking, the activation energy E of the fracture process was calculated. Comparing of the found E values with the close values of E for the known processes developing in steels, the explanation of the revealed cracking behaviour at different temperatures was proposed. Findings: Delayed cracking of the martensitic weld joints has started to manifest at the temperatures lower than 140°C. Dependence of the cracking period from the temperature is described by C-type curve with the minimum cracking duration within 80-100°C. Using the approach of the activation energy assessment for different temperature ranges (140 to 100°C and 80 to 20°C), the effect of the diffusible hydrogen and a martensite decay on the cracking thermokinetics was considered. Research limitations/implications: Additional investigations of the fine microstructure after different stages of the low-temperature martensite decay could be necessary for deepening understanding of a role of this process in the low-temperature heterogeneity formation and cracking susceptibility. Practical implications: Results widen data on weldability of actual for industry steels and give a ground for consideration of the technological approaches for their welding. Originality/value: Temperature border of the cold cracking risk is specified for the weldments of some commercial steels.<br/><br/>
Authors and Affiliations
V. Skulskyi, M. Nimko
Development of key performance selection index model
Purpose: The main idea of this paper is to introduce the refined model for selection of the Key performance indicators (KPI). The KPI selection model can be considered as a tool for analysis of the enterprise, which sh...
The role of actively diffusing impurities of sulfur and oxygen in ductility-dip cracking susceptibility of Ni-Cr-Fe welds
Purpose: To determine the temperature conditions of sulphur and phosphorus moving to sample surface for alloys with different initial sulphur content. Design/methodology/approach: Investigation of samples from In 690, Kh...
Application of FMEA method for an analysis of selected production process
Purpose: The article presents an application of FMEA method in a process of chimney system production. The analysis allowed to decrease a potential defects and their effects in the analysed process. Design/methodology/ap...
Effects of multi-pass FSP on the β phase (Mg17Al12) distribution and mechanical properties of AZ91C magnesium alloy
Purpose: The principle and advantages of friction stir processing (FSP) for the production of a highly formable Mg alloy, and some convincing experimental results are reported in this paper. The aim is to understand the...
Use of optical microscopy for evaluation of tooth structure
Purpose: There are many methods of examining tooth anatomy: some of them areapplicable to the hard tissues, while others to the pulp and the root canal system. Everymethod has some advantages and disadvantages in terms o...