Wednesday, November 30, 2016

Bearing Design Guide: Chapter Nineteen: Heat Treatment of Aluminum Bronze Alloys


C95400 Cast Aluminum Bronze

          The cast aluminum bronzes consist of copper and aluminum with lesser additions of iron, nickel or manganese elements, primarily to enhance the tensile strength, yield strength, hardness, wear resistance, fatigue resistance and corrosion.
     
          The more popular aluminum bronzes contain from 8 to 13 % aluminum, up to 5% iron, nickel and manganese in various combinations.

          As the aluminum content increases, the tensile strength, yield strength and hardness also increase but ductility decreases.

          The aluminum bronze alloys with 10% or more aluminum content can be heat-treated successfully to further increase the physical and mechanical properties of the alloy.

         The normal heat treatment sequence of aluminum bronze alloys with 10% or more aluminum content is to solution heat soak the alloy at 1650 degrees F for at least two hours, then quenching rapidly in water. Slow cooling results in "self-annealing" and produces a coarse structure with greatly-reduced properties.

          Following the heat-treatment sequence, a tempering treatment is required by reheating the casting to 1000 to 1150 degrees F for one hour then quenching in water.

          The heat-treatment changes the "as cast" alloy's micro-structure to a finer grain, resulting in substantial increases in tensile strength, yield strength and hardness but with a fairly high reduction in ductility.

          The wear resistance also is greatly improved by heat treatment without correlation to hardness. It does not seem to cause increased damage to steel shafts.


Solution Heat Treating
That's it for today.  Until next time my metal loving friends...

Next Up: Chapter 20: Thrust Bearings or Washers


4 comments:

  1. Wow, excellent post. I'd like to draft like this too - taking time and extremely hard work to make a great article. Visit SS Seamless Pipe manufacturer in India. This post has inspired me to write some posts that I am going to write soon.

    ReplyDelete
  2. Thanks for such a pleasant post. This post loaded with lots of useful information. Keep it up. If you are looking for the best information and suggestions related to SS 304 Pipe Fittings manufacturers in India then visit spmetal.

    ReplyDelete
  3. Really helpful down to the ground, happy to read such a useful post. I got a lot of information through it and I will surely keep it in my mind. Keep sharing. If you are looking for some useful data and information regarding S690QL Steel Plate manufacturers then visit tritonalloysinc.


    ReplyDelete


  4. Thanks for discussing, great news. This type of news is really appreciative. I have great news. Your article is very informative, Visit API 5L X65 Pipe. Thanks for sharing.

    ReplyDelete