Nikolai I. Kobasko

11 Questions 34 Answers 0 Followers

Questions related from Nikolai I. Kobasko

Why do we need a "Smart Robot" to be used for recipes development and controlling performance?

We are discussing here intensive quenching processes: IQ-2 and IQ-3 technologies. The IQ-2 technology requires the duration of transient nucleate boiling process evaluation during batch quenching....

08 July 2015 6,292 5 View

How can we solve a problem on different hardenabilities of each specific steel?

We have developed a method for optimizing chemical composition of steel to provide maximal compressive residual stresses at the surface of steel parts after intensive quenching. Depending on size...

01 May 2015 9,909 2 View

What is an optimal hardened layer in real steel parts after quenching?

When bottle with water is frozen through, it cracks. The same is often happening when steel parts are quenched through. To prevent crack formation, such steel parts are quenched very slowly in...

14 April 2015 3,182 5 View

Is it possible to get the bainitic nano- structure for plain carbon steel?

The bainitic nano - structure was obtained for alloy steel containing 0.98C; 1.46Si; 1.89 Mn; 1.26 Cr; 0.09 V (see www.msm.cam.ac.uk/phase-trans). I'm wandering whether is it possible of obtaining...

03 April 2015 5,791 2 View

Why are critical heat flux densities not widely used when investigating cooling intensities of quenchants?

The main characteristics of liquid quenchant are critical heat flux densities qcr1 and qcr2. At present, nobody in heat treating industry uses them and doesn't an appropriate standard exist to...

25 March 2015 4,742 11 View

What are the main differences between steady - state and transient nucleate boiling processes?

I'm wondering whether we can use heat transfer coefficients (HTCs) received for steady - state nucleate boiling condition to calculate temperature fields in steel parts during transient nucleate...

29 January 2015 1,583 11 View

How does oil temperature decrease distortion of steel parts during quenching process?

Usually, quenching of steel parts and tools are preformed in oils at the temperature 30oC - 60oC where distortion is high due to high viscosity of oils. In different surface areas of steel part...

17 January 2015 6,844 3 View

Why engineers instead of real HTCs use effective HTCs during boiling?

Real heat transfer coefficient h during nucleate boiling process means a ratio h=q/(T-Ts). Effective heat transfer coefficient is calculated as h = q/(T-Tm). Where q is heat flux density;...

18 December 2014 8,080 4 View

Are there some new investigations on Grossmann factors f?

Grossmann factors f are used to calculate hardenability of steel depending on amount af alloys in steel. On the other hand, compressive residual stresses at the surface of steel parts depend on...

17 December 2014 4,313 1 View

What is the original/up-to-date technique used for intensifying quenching of machine components based on transient nucleate boiling processes?

In metallurgy the effective heat transfer coefficients (HTCs) of transient nucleate boiling processes are used which are ten times less as compared with the real HTCs. The original technique for...

12 October 2014 2,190 2 View

Who is interested to investigate further the self - regulated thermal process and the super- strengthening phenomenon?

During the self- regulated thermal process, the surface temperature of quenched steel parts maintains at the level of boiling point of liquid. That can be used to monitor phase transformation in...

14 February 2014 759 3 View