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In This Issue

1   July Trivia
2   When to use a "Buffer Layer"
3  Postalloy® PS-10   The Ultimate in Abrasion Resistance
4   Humor: Whatever Goes Around Comes Around
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July Trivia

Three US Presidents were born on the 4th of July, John Adams, Jefferson, and Monroe
Only one US President died on 4th of July ... Calvin Coolidge  1872
The Battle of Gettysburg (July 1,2,&3  1873) was the largest battle ever fought in the Western    Hemisphere
Neil Armstrong set foot on the moon on July 20, 1969.
Jimmy Hoffa disappeared on July 30, 1965.  Hasn't been found yet.
The very first Baseball All Star gamed was played on July 6, 1933
The Ice Cream Cone was first introduced at the St. Louis Worlds Fair on July 23, 1904


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"When to use a Buffer layer "

Either of these terms can be applied to hardfacing, but I particularly like the second definition.  Buffer layers are used to protect the base material from the effects of the subsequent hardfacing layers.  For example; the ground engaging knives used on an M1 mine sweeper are made of a hardened 4130.  Postalloy® 2836 SPL was chosen to be the product of choice to protect and enhance the wear life of these components.  Direct application of Postalloy® 2836 to the 4130 would produce check cracks that penetrate the hardened base material and could ultimately lead to a catastrophic failure.  To guard against this, a layer of 309 or 312 stainless is applied as a buffer.  Either of these alloys are compatible with carbon steels and provide a tough barrier against any check cracking from the Postalloy® 2836.  The check cracks that develop in the hardfacing are quickly blunted at the stainless barrier and do not propagate into the base material.  You may be asking if 309 or 312 are the only choices, and the answer is no.  We could use a manganese product instead.  Postalloy® 285 or Postalloy® 2865 could be used successfully.  I particularly like 2865 because of the high amount of Chromium in the deposit.  This contributes to the formation of Chromium Carbide on subsequent layers of any of the Chromium Carbide electrodes or wires. 

Buffer layers can serve another purpose as well.  In the case of manganese crusher rolls where overheating can lead to cracking, a buffer layer of Postalloy® 2865 is used to thwart the heat flow from welding.  In other words, when subsequent layers of hardfacing such as Postalloy® 2834 are applied, the welding heat is prevented, or at least slowed because of a change in heat conductivity, from entering the manganese roll and embrittling it.  

Another example of buffering is the use of Postalloy® 44MCG, a Nickel/Iron alloy, on Cast Iron.  In this case the Nickel changes the behavior of subsequent layers of Postalloy® 2839, making it tougher, less crack sensitive, while still retaining excellent abrasion resistance. 

So, when do we use buffer layers?  

1. On hardened steels to prevent check cracking from penetrating into the base material.
2.  To provide a heat barrier for Manganese parts.
3.  To alter metallurgical behavior of hardfacing products.

Applying buttering layers is not as straight forward as I have presented it here, so it is always advisable to contact us regarding your specific application.

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Postalloy® PS-10      The Ultimate in Abrasion Resistance

http://www.postle.com/Newsletter/PS10.pdf

Call us or email sparky at sparky@postle.com with your application.  We'll be happy to help.

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His name was Fleming, and he was a poor Scottish farmer. One day, while trying to make a living for his family, he heard a cry for help coming from a nearby bog. He dropped his tools and ran to the bog. There, mired to his waist in black muck, was a terrified boy, screaming and struggling to free himself.. Farmer Fleming saved the lad from what could have been a slow and terrifying death.

The next day, a fancy carriage pulled up to the Scotsman's sparse surroundings. An elegantly dressed nobleman stepped out and introduced himself as the father of the boy Farmer Fleming had saved. "I want to repay you," said the nobleman. "You saved my son's life.

"No, I can't accept payment for what I did," the Scottish farmer replied, waving off the offer.

At that moment, the farmer's own son came to the door of the family hovel. "Is that your son?" the nobleman asked..

"Yes," the farmer replied proudly.

"I'll make you a deal. Let me provide him with the level of education my own son will enjoy. If the lad is anything like his father, he'll no doubt grow to be a man we both will be proud of." And that he did.

Farmer Fleming's son attended the very best schools and in time, he graduated from St. Mary's Hospital Medical School in London, and went on to become known throughout the world as the noted Sir Alexander Fleming, the discoverer of Penicillin.

Years afterward, the same nobleman's son who was saved from the bog was stricken with pneumonia. What saved his life this time? Penicillin.

The name of the nobleman? Lord Randolph Churchill.

His son's name? Sir Winston Churchill.

Someone once said:

What goes around comes around.

Work like you don't need the money.

Love like you've never been hurt.

Dance like nobody's watching.

Sing like nobody's listening.

Live like it's Heaven on Earth.
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