Evaluation of Mechanical Properties of Sintered Hot Upset Forged Square Cross Section Bars of Chromium-Molybdenum Low Alloy Steels
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2014, Vol 4, Issue 6
Abstract
Present investigation pertains to evaluate the tensile properties of sintered hot forged and oil quenched and also homogenized, but furnace cooled specimens which were machined from square cross section bars of approximate dimensions of ~13mm x ~13mm x~100±5mm of Fe-0.16%C, Fe-0.16%C-0.7%Mn, Fe-0.16%C-1.0%Cr-0.55%Mo and Fe-0.16%C-2.25Cr-1.05%Mo P/M steels prepared from elemental powders. Green compacts of homogeneously blended powders of all compositions were prepared with initial aspects ratio of 1.34 with diameter being 27.5mm using suitable compaction die set assembly on 1.0MN capacity UTM to a density level of 0.85±0.01 of theoretical employing controlled pressures in the range of 490±10MPa and taking pre – weighed powder blends. All green compacts were protected during sintering by applying thin film of indigenously developed ceramic coating on the entire surfaces. Ceramic coated compacts were sintered in an electric muffle furnace at 1373±10K for a period of 120 minutes. All sintered preforms of each com position were hot forged on a 1.0MN capacity friction screw press to square cross section bars of afore mentioned dimensions. Once the forging operation was completed 10-12 bars were quenched in linseed oil and nearly 12 bars were homogenized at sintering temperature for one hour and then cooled inside the furnace itself. Standard tensile specimens were machined and tested on Hounsfield Tensometer for evaluating tensile properties which were appreciably close to the properties reported in literature for the above steels. Microstructure of specimens containing chromium and molybdenum exhibited few un-dissolved particles along with the presence of fine pores. SEM Fractography revealed mixed mode failure mostly ductile and partly brittle. These steels also exhibited adequate ductility as is exhibited by conventionally produced steels. Thus, this investigation shows the way how to produce high density P/M steels which can be used in structural applications.
Authors and Affiliations
Hemlata Nayak, C. M. Agrawal, K. S. Pandey
Keywords
Related Articles
- EP ID EP131812
- DOI -
- Views 76
- Downloads 0
A Production of biodiesel from rice bran oil and experimenting on small capacity diesel engine
Abstract: Increased environmental awareness and depletion of resources are driving industry to develop viable alternative fuels from renewable resources that are environmentally more acceptable. Vegetable oil is a...
Solar-Thermoelectric Hybrid Powergenerator
Hybrid Photovoltaic and thermoelectric systems more effectively converts solar energy into electrical energy. Two sources of energy are used one of the energy is solar,that converts radiant light into electrical energy a...
Big Bang–Big Crunch Optimization Algorithm for the Maximum Power Point Tracking in Photovoltaic System
This paper presents an intelligent control method for the maximum power point tracking (MPPT) of a photovoltaic system under variable temperature and irradiance conditions. The Big Bang–Big Crunch (BB–BC) optimization...
Microcontroller Based Automatic Sprinkler Irrigation System
Microcontroller based Automatic Sprinkler System is a new concept of using intelligence power of embedded technology in the sprinkler irrigation work. Designed system replaces the conventional manual work invol...
Statistical Optimization for Generalised Fuzzy Number
Abstract: In this paper an attempt has been made to propose a method based on Pascal triangular graded mean representation to solve the two-objective fuzzy assignment problem under fuzzy environment. In this, cost...