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Technical Discussions
Ermanno
Italy, Joined Mar 2017, 1

Ermanno

Italy,
Joined Mar 2017
1
21:06 Mar-26-2017
17.4 and 15.5 PH - MT

Is it possible to carry out MT on 17.4 PH and 15.5 PH grades?
After solution heat treatment and ageing treatment only?
Thank you.

 
 Reply 
 
angelo
Italy, Joined Nov 2012, 13

angelo

Italy,
Joined Nov 2012
13
21:29 Mar-26-2017
Re: 17.4 and 15.5 PH - MT
In Reply to Ermanno at 21:06 Mar-26-2017 (Opening).

Ermanno,
entrambi gli acciai sono magnetizzabili anche se sono noti per avere permeabilità più bassa.
è preferibile lo stato completamente trattato.
È possibile che si evidenzino indicazioni magnetiche dovute a fasi metallurgiche diverse (eg delta ferrite).
è comunque indispensabile seguire le procedure approvate e utilizzare QQI o simili per verificare l'adeguatezza del campo magnetico

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
12:09 Mar-28-2017
Re: 17.4 and 15.5 PH - MT
In Reply to Ermanno at 21:06 Mar-26-2017 (Opening).


Yes it is possible to carry out MT on these steels.

Their micro structure consists of basically Martensitic phase, in heat treated condition.

Even after precipitation hardening, their micro structures predominantly consists of Martensite, which is ferromagnetic.

As such both steels can be subjected to MT.

Best wishes

P V SASTRY

 
 Reply 
 

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