Hardness Testing free essay sample

Engineering Materials 1 Title: Objective: Hardness and Impact Tests of Steels To understand the mechanical properties of a metal (steel) particularly the relationship between hardness and impact Equipments: Rockwell Hardness tester and Chirpy Impact tester Samples: 1 . Gauge plate about 0. 9%C As supplied (annealed): AS Water quenched: WAG Oil quenched: CO Water quenched + tempered: WAG + T Oil quenched + tempered: CO + T 2. Key steel about 0. 4%C As supplied (annealed): AS Water quenched: WAG Procedures: Samples have been heat treated using the following conditions: Systematizing at about COCO for 30 minutes, followed by water quench or oil quench. Some samples are then tempered at COCO for 1. Ah and allowed to cool in still air. The samples are ground/polished to remove the scales/oxide prior to hardness and impact tests. Results and Observation: Compare the hardness results with the impact values. Report (maximum 4 pages): Background Theory Procedures Results Discussion (see next page) Conclusion Make relevant comments about the experiment and the data ensuring that you answer the following in your comments: 1. We will write a custom essay sample on Hardness Testing or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The relationship between heat treatment and toughness and hardness I. E. Briefly explain why the different heat treatments give different toughness and hardness values. What do you think is the difference between hardness and toughness? Explain the general relationship between hardness and toughness. 2. Relate the observed fracture surfaces of the samples to the Chirpy Impact results and in terms of brittle or ductile fractures. Report due: Friday, 6 Seep 2013 by 4 pm (drop box WAS Bldg Level 3)

Compressed Natural Gas (CNG) Conversion Kits

Compressed Natural Gas (CNG) Conversion Kits Compressed natural gas (CNG) conversion kits  allow a mechanic to convert a conventional gasoline car to one that runs on the CNG. Although the process is complex, it is not necessarily difficult and quite doable. And if you are mechanically inclined, it could feasibly be done in your own garage. The other option is to find a willing mechanic that will install a CNG kit for you! This type of alternative fuel also comes with its fair share of advantages including more engine power, better fuel efficiency and longer engine life overall. However, there are also several concerns you should address before committing to fully converting your vehicle. You should consult a trusted mechanic for more information regarding the logic of making this change. Common Concerns One potential hoop to jump through could be emissions certification for your particular state - some states require special conditions since youd be changing the vehicles engineered fuel type. They all differ, and some are easier to work with than others. The U.S. Department of Energy offers this emissions certification information and CSA America offers a searchable database of compressed natural gas cylinder inspectors. Another be-aware-before-you-do-it-item is to locate the CNG fueling stations in your area to be sure you’ll have regular access to the fuel. This station finder for CNG and alternative fuels includes pricing for the United States. Another alternative, if you have natural gas in your home, is to install a Phill home refueling appliance. These devices compress and dispense a tank of fuel in about 8 hours. They are designed to be attached overnight, delivering a full tank by morning. Another option could be to install a CNG compressor at your house, which typically runs upwards of $4,500. Where to Get the Kits Fortunately, there is no shortage of vendors for these CNG conversion kits. Websites like  CNG Interstate  which not only offers a bi-fuel CNG/gasoline conversion kit and CNG cylinders but also a plethora of information related to understanding how they work.   Grimhall Vehicle Upfitters also offers CNG conversion advice for home installation and is a valuable reference for regulatory and safety information. Although their online store is still relatively new, they offer plenty of products for CNG conversion. Speaking of, chances are your local mechanic will also be able to get the right tools for the job, but if you live in the Denver Metro area, Redmark CNG Services offers alternative fuel conversions for a variety of American vehicle makes and models with installations available directly at their facility. Similarly,  Tulsa Gas Technologies  offers full conversions in Tulsa, OK, and Dallas, TX.