Authentic voices. Remarkable stories. AOL On Originals showcase the passions that make the world a more interesting place.
Gwyneth Paltrow and Tracy Anderson spend time with women who've overcome hardship, injury, and setbacks to triumph in the face of adversity. We'll hear their inspiring stories firsthand, whether fighting back from a career-ending injury or transforming their lives and bodies through diet and exercise.
Enter the graceful but competitive world of ballet through the eyes of executive producer, Sarah Jessica Parker. This behind-the-scenes docudrama reveals what it takes to perform on the ultimate stage, the New York City Ballet. Catch NYCB on stage at Lincoln Center.
The Future Of Us is a powerful original series from television personality, futurist, filmmaker and techno-philosopher, Jason Silva. In this series, Silva shares his excitement around recent discoveries and inventions.
ACTING DISRUPTIVE takes viewers inside the businesses and passion projects of Hollywood’s top celebrities.
They say every picture tells a story and AOL On's new original series My Ink proves it. Travel along as some of the world's greatest athletes bring their tattoos to life through exclusive interviews and visits to their favorite tattoo parlors.
Explore what it means to be human as we rush head first into the future through the eyes, creativity, and mind of Tiffany Shlain, acclaimed filmmaker and speaker, founder of The Webby Awards, mother, constant pusher of boundaries and one of Newsweek’s “women shaping the 21st Century.”
Discover crowdfunded small business success stories with author, comedian, and entrepreneur Baratunde Thurston.
Go behind-the-scenes with racing's hottest, young talent, 17-year-old Dylan Kwasniewski, as he aspires to make it in the #1 motorsport in America – NASCAR
Follow Scott Schuman, the Sartorialist, from the streets of NYC to the capitals of Europe on his quest to photograph and document the best in culture and fashion.
Iconic potter, designer, author and personality Jonathan Adler shares his unique perspective on creativity. Showcasing the inspiration Jonathan finds in the most unlikely people and places, Inspiration Point will add style, craft and joy to your life.
Serving Innovation gives a fresh look into the stories and passions that motivate some of the most innovative tastemakers in America.
A documentary directed by Alex Winter exploring the Napster downloading revolution; the kids who created it, the bands and businesses that were affected and its impact on the world at large.
Nicole Richie brings her unfiltered sense of humor and unique perspective to life in a new series based on her irreverent twitter feed. The show follows the outspoken celebrity as she shares her perspective on style, parenting, relationships and her journey to adulthood.
Learn about the stories behind 10 extraordinary inventions. In this video, you'll learn about stainless steel.
Tags:Learn About Stainless Steel,accidental inventions,education,invention stories,invetions,stainless steel,vat19.com
Grab video code:
Male Speaker: Man has been experimenting with iron alloys for thousands of years. But it wasn't until 1913 that an English metallurgist stumbled upon one of the world's most useful iron alloys, stainless steel. Iron, as found in nature, is known as iron ore and is the fifth most abundant element on earth. It is second only to aluminum among the metals and constitutes nearly 5 percent of the earth's crust. From a structural engineering perspective, iron ore is not very useful because it is relatively soft, not much harder than copper.
Sometime around 1300 BC in what is now Turkey, the Hittites began to derive iron from its ore, beginning a rapid export of iron metallurgy techniques across Europe and Asia and ushering in the Iron Age. Previous metalworking techniques consisted of heating two metals until they became liquid and then pouring the mixture into a mould while it cools. This technique, if applied to iron, results in a rigid, brittle metal, undesirable for tools and weapons. The Hittites discovered that iron ore can be strengthened and hardened by heating it over a bed of charcoal.
Dr. Ralph M. Rowlett: If you get the optimum amount of carbon in there about 0.1% carbon, it still be the highest grade steel. So, that's a pretty good steel right from beginning is just they know when they had it.
Male Speaker: When the two are placed in a furnace, the carbon diffuses into the iron and upon cooling, favorably changes the overall crystalline structure. As iron is heated above about 1200 degrees Fahrenheit, its crystalline form changes from a tightly-packed cubic structure to one with roughly 25% more space. At these high temperatures, a small carbon atom can fit into the tiny spaces between the iron atoms.
If this mixture is then quickly cooled, the iron atoms will attempt to reconfigure themselves into the tightly packed structure. The presence of the carbon atoms, however, creates a distortion, which makes it much harder to bend or shape the steel. Creating steels from iron ore resulted in stronger weapons and tools. Over the next several thousands of years, the processes of refining became more advanced. Steels were used for more applications such as railroads and buildings. The only problem was that traditional steels could not resist corrosion. In sufficiently humid air, steel would rust.
In 1908, Harry Brearley, a 36-year old English metallurgist, was given the opportunity to head up the Brown Firth Research Laboratory in Sheffield, England. Brearley left school at the age of 12. Through self-study and night school, he became an expert in the analysis and production of steel. In 1912, Brearley's laboratory was commissioned to research ways to eliminate erosion in gun barrels. When a bullet is fired by a gun, it is actually propelled down the barrel by expanding gas detonated in the chamber. The friction between the bullet and grooves in the barrel called rifling causes the bullet to spin, increasing accuracy. The friction, however, causes wear on the barrel.
Eventually the barrel will be too big for the bullet, causing inaccuracy. What was needed was a harder metal that could resist higher temperatures. Brearly spent months experimenting with steel alloys, varying the mixture of steel and other metals. None of his alloys had much success in reducing barrel erosion and Brearley simply tossed the failed samples into a junk pile.
Months later Brearley noticed one of the samples in the pile retained its bright luster while the others had rusted. This sample had particularly high levels of chromium, approximately 12%, which accounted for its corrosion resistance. Chromium, which accounts for stainless steel's resistance properties has a high affinity for oxygen, and when present in sufficient quantities in iron forms a protective layer on the surface of the steel. This layer is incredibly thin, roughly one ten-thousandths of a centimeter thick. This is roughly the equivalent of a 30 foot tall building being protected by a film the thickness of a piece of paper.
Yet, this microscopic layer clings tightly to the steel. If it is damaged or forcibly removed, more chromium will be exposed to the air and more of the protective chromium oxide will be formed. This self-renewing feature makes stainless steel an ideal material for thousands of applications. It has a life-span of nearly 100 years and requires no upkeep.
Robert Gombas III: The number one benefit of the stainless steel in a professional food service stall is going to be sanitation without a doubt. The ability to use stainless steel in your preparation areas maintains a sanitary environment, its easy to clean, it doesn't get damage it easily.
Male Speaker: Brearley called his new invention rustless steel because the city of Sheffield was known for its cutlery, he had a knife-smith make him a batch of knives. Unfortunately, Brearley's rustless steel wasn't particularly well suited to cutlery, it couldn't hold an edge. Poorly received by the public, Brearly soon earned a reputation for making knives that would not cut. It would take years of refinement and research to create stainless steel that also held a cutting edge. The name stainless steel is attributed to a manufacturer who noticed that the steel did not stain when dipped into vinegar.
It's low weight and resistance to oxidation at high temperatures has had an effect on almost every modern industry from food preparation and storage to transportation to medicine. You can find it in battleships and in sewing needles. It is in your home in the form of utensils, your kitchen sink, and vacuum cleaner. It is truly a marvel of technology.