where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

517 views
Technical Discussions
Eric Chen
Engineering,
GE Aviation, China, Joined Nov 2002, 7

Eric Chen

Engineering,
GE Aviation,
China,
Joined Nov 2002
7
09:26 Apr-14-2008
MT for bearing hardening surface

In the past PT was carried out for the hardening surface of bearing. Now some company change to MT with AC yoke. My question is where is the hardening crack starts from? The interface between the harden layer and the parent material or the hardening crack starts from the bearing surface? If the hardening crack starts from the interface between the parent material and hardening layer, DC would be better than AC.

Can some one explain to me?

Thanks!


    
 
 
Godfrey Hands
Consultant,
PRI Nadcap, United Kingdom, Joined Nov 1998, 295

Godfrey Hands

Consultant,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
295
03:10 Apr-21-2008
Re: MT for bearing hardening surface
----------- Start Original Message -----------
: In the past PT was carried out for the hardening surface of bearing. Now some company change to MT with AC yoke. My question is where is the hardening crack starts from? The interface between the harden layer and the parent material or the hardening crack starts from the bearing surface? If the hardening crack starts from the interface between the parent material and hardening layer, DC would be better than AC.
: Can some one explain to me?
: Thanks!
------------ End Original Message ------------
For production of bearing parts, the surface is probably the most critical surface, but when the bearings have been in service, failure is most likely to originate at the "Hertzian zone", which is just underneath the raceway ( microns to millimetres depending on bearing size, geometry etc). MT with DC should be considered here, but make sure that you can adequately demagnetize the part, else the residual magnetism will attract ferrous particles which can quickly destroy a bearing.

Godfrey



    
 
 

Product Spotlight

NOVO Armor 15 & NOVO Armor 22

The Armor Kit Contains the NOVO Armor, which provides additional mechanical protection to the NOVO 1
...
5WN & NOVO 22WN Detectors, the Armor Stand and a traveling soft cover. - Newest shock absorbent technology case - Water resistant design - Supports wired & wireless communication - Multiple positioning options - Tripod connection using the Built-in 1/4” threads - Simple Detector battery replacement
>

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

FD800 Bench Top Flaw Detectors

The bench-top FD800 flaw detector range combines state-of-the-art flaw detection with advanced mater
...
ial thickness capabilities. Designed for use in the laboratory these gauges are the tool you need for all your flaw detecting needs.
>

GEKKO - Portable Phased Array Testing with TFM in Real-Time

The portable phased array testing system GEKKO provides 64 parallel test channels. On creating testi
...
ng parameters the operator is assisted by the CIVA software. Due to its modular set-up the GEKKO instrument is suitable for operators of all skill levels.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window