mahdi nasri

Human resources are the center of sustainable development in advanced management. Health, Safety and Environment (HSE) is a system that consistently and by means of human resources, facilities and equipment and tries to create a healthy, pleasant, fresh environment away from accident, damage and waste. This study was conducted to assess the health performance, Safety and Environmental Indicators (HSE) in the field of human resources development of Tehran Municipality.

This study was conducted as a descriptive cross-sectional and, the study base was all 22 districts of Tehran municipality. After designing and validating of HSE performance evaluation protocol, HSE status was evaluated in 22 districts of Tehran. The aforementioned protocol contained seven sections: leadership and commitment, policy and strategic goals, organization and documentation, risk management, planning, implementation and monitoring, audit and review). Its validity and reliability were determined by obtaining corrective opinions from specialists and experts inside and outside the municipal organization.

In most areas of Tehran municipality, the inter-organizational communication index was the highest score. The highest score (68%) is related to this index. The mean overall score for performance evaluation was 46.6.

The HSE situation was undesirable (less than 70%) in more than half of Tehran's municipalities. Regions 4 and 7 were in desirable status (above 70%). Thus, for current situation improvement, we should use long-term strategy planning in the field of HSE.

1.4923 stainless steel is one of the options for producing Iranian gas turbine (IGT25) compressor blades and upgrading IGT25 +., as well as the importance of wear resistance in turbine parts and the small number of studies in the field of wear as a destructive mechanism of turbine parts, in this research the effect of residual stress caused by shot peening on the wear resistance of steel 1.4923 was investigated. To create the compressive residual stress, shot peening operations were used at 5, 10, 15 and 20 minutes. Microstructural studies by optical microscopy (OM) and scanning electron microscopy (SEM) showed that with increasing shot peening time, the thickness of the plastic deformation area increases so that the plastic deformation area can be divided into three plastic deformation areas. Severe, ordinary plastic deformation and the area affected by plastic deformation. Calculations on the results of X-ray diffraction (XRD) showed that with increasing shot peening time, the amount of compressive residual stress increases to 694 MPa. With increasing compressive residual stress on the surface, the wear resistance of the samples increased up to 90% due to the increase in the density of dislocations and grain refining.  Also, the investigation of worn surfaces by SEM showed that the wear mechanism in the samples is oxide adhesive wear and increasing the residual stress of the samples causes the transfer of the wear regime to mild wear abrasion with the appearance of crater areas.