Fatigue Behavior of Alloy Steels Sintered from Pre-Alloyed and Diffusion-Bonding Alloyed Powders
Round 1
Reviewer 1 Report
- Need to explain more about the calculation method adopted in the Murakami method. How the volume is calculated either full pore-volume or largest pore, how the volume is determined? What is the hardness value considered? The cross-sectional area of the volume with respect to the stress?
- What do you mean by simulation?
- Why fig 3 is it better to show pore-volume?
- “ Therefore, the origination of cracks was preferable to occur in the interior of base powder matrix with a microstructure composed of soft phases (ferrite, pearlite or bainite), resulting in a fracture mode of trans-particle fracture. In contrast, in the pre-alloyed Astaloy CrM steel with a microstructure consisting of homogeneous mono-phase of martensite, micro-cracks were most likely to nucleate, and then prop- 326 agate through the channel constructed by sintering necks.”
I feel the crack should originate from the pores and propagation might be affected by microstructure.
- Were there any tensile tests conducted?
- Some minor corrections as below
Figure 1, 4, 9: y-axis; fatigue strength symbol
Figure 2: Caption; (d) is typed wrong
Check the spacing between the units ie. Line 145 320MPa etc. Check throughout the paper.
Error bar
Why different symbols for fatigue strength during the text and in Eqn 1.
Make all the terms like C, HV etc in italics
Line 333 Micsesro ? typo
Author Response
Please see the attachment
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Further information on fatigue tests including number of specimens tested and Basquin curve for finite life is required. If the test is a bending test (line 102), confirm if it is R=-1. It is remarkable that a test at 30Hz would need more than one week to reach the run-out. Include the results obtained (number of cycles) for the different materials tested and for each test.
Author Response
Please see attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The article is revised.
