Re: [MW:11984] AISI 4140 Aluminium Branze overlay

Eswaran,

For AISI 4140 Base material welding with minimum preheat tempr shall be between 200c to 315c.

Post weld heat treatment shall be 640c.

Soaking range between 120 to 180 min.

Heating & cooling rate above 300c shall be 100c/hr max.

Cooling after 300c may be uncontrolled.

Note: Longer soaking time with lesser thickness of coupon will leads to decreasing in yield strength & Hardness as well. Therefore the thumb rule is as 1" thick for 1Hour soak time.

Hope this will solve your issue 

Regards,

Mubeen

On Thu, Jul 28, 2011 at 5:50 PM, Eswaran samikannu <eswaranaws@yahoo.co.in> wrote:

AISI 4140 hard facing regarding by GTAW -2 layers above base material -App 6.0mm Height

 

Base material specification – (Client requirement) Heat treated to 95 KSI Tensile strength and 85 KSI Minimum Yield strength, Hardness between HBW 220 to 240

 

I used this forged Bar (Sliced into 30 mm THK Plate) for Aluminum Bronze hard facing & stress relieved at 620 deg for around 5 hrs .

 

We follow the ASME Sec IX for procedure qualification Specimen failed in Yield strength (Drop in yield strength around 75 KSI).

 

Any one can help me to post weld heat treatment (Post weld stress relief) thickness versus time and what are the effects of longer time PWHT below A1 temperature of Low alloy steel

Expert can help me

Thanks

Regards

Eswaran

 

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