Vignesh Nallasivam

7 Questions 21 Answers 0 Followers

Questions related from Vignesh Nallasivam

Is there any realistic hydrogen induced cracking test for Automotive steels (Martensitic -AHSS)?

I feel like the current A/SP Delayed Cracking test is too aggressive than reality.

07 July 2018 7,336 0 View

What is the good characterization technique to measure Carbon segregation in Low carbon steel ?

Carbon is tricky to measure in SEM/EDS due to interaction volume, X-ray energy loss due to atomic weight difference and absorption as well as fluorescence effects. APT is good. Is there any other...

03 March 2018 10,043 9 View

How many packets, blocks and laths can be present in one prior austenite grain size of 25 microns for 0.3 carbon steel?

Lath Martensite: How many packets are in one prior austenite grain? How many blocks are in one Packet? How many laths are in one block (approximately)? what is the role of orientation relationship?

09 September 2017 7,404 4 View

What is the significance of quenching non-homogeneous austenite on mechanical properties in 0.2-0.4% carbon steels at high heating and cooling rate?

Physical behavior of Lath Martensite with heterogeneous local chemistry and microstructure resulting from non-homogeneous Austenite during very short holding time and rapid quenching.

05 May 2017 7,184 2 View

Is there any realistic hydrogen induced cracking test for Automotive steels (Martensitic -AHSS) at industry level ?

The current A/SP Delayed Cracking test (attached) is too aggressive (0.1 N, pH=1) than reality. Curious if there is any simple mechanical test can be used

01 January 1970 9,013 4 View

Will bimodal grain size distribution in DP steel improve the hole expansion ratio (HER) /stretch flangeability?

DP 590, 780, 980. Ultra fine ferrite grain will accommodate less strain compared with coarser one, will bimodal distribution helps to improve HER ? The aspect ratio is ferrite is more than 3 times...

01 January 1970 1,334 2 View

How much (%) automotive grade steel strips are produced by thick slab, thin slab and novel ( twin roll or belt) casting ?

Automotive applications - conventional and advanced high strength strip grades - considering current usage and projected future usage (to determine grades of future interest).

01 January 1970 7,749 2 View